NEC IS015-9E User Manual

NEC Storage Manager

Data Replication User’s Manual

(Function Guide)

IS015-9E

No part of the contents of this book may be reproduced or

transmitted in any form without permission of NEC Corporation.

The contents of this book may be modified without notice in the future.

Preface

This manual describes how to use the data replication function provided by NEC Storage DynamicDataReplication

Ver2, NEC Storage RemoteDataReplication Ver2, and NEC Storage ReplicationControl.

The data replication function consists of the replication volume creation function provided in a disk array and

software to manage and operate it. It utilizes replication volume to make business operation more effective.

Refer to the “NEC Storage Manager Manual Guide” (IS901) for the overview of NEC Storage and the related

manuals. Refer to the “NEC Storage Manager Data Replication User’s Manual (Disaster Recovery System

Installation and Operation Guide)” (IS027) for the usage of the remote data replication functions provided by NEC

Storage RemoteDataReplication/DisasterRecovery and NEC Storage ReplicationControl/DisasterRecovery.

Remarks 1. This manual explains functions implemented by the following program products:

• NEC Storage Manager and NEC Storage BaseProduct

• NEC Storage DynamicDataReplication

• NEC Storage ReplicationControl

• NEC Storage RemoteDataReplication

2. This manual is applicable to the program products of the following versions:

• NEC Storage Manager Ver3.3

• NEC Storage BaseProduct Ver3.3

• NEC Storage ReplicationControl Ver3.3

3. The NEC Storage Manager is referred to as iSM or Storage Manager in the text of this manual.

Also, the NEC Storage series disk array subsystem is referred to as a disk array.

4. The following descriptions in the text of this manual refer to the corresponding products.

Storage Manager NEC Storage Manager

AccessControl NEC Storage AccessControl

DynamicDataReplication NEC Storage DynamicDataReplication

RemoteDataReplication NEC Storage RemoteDataReplication

RemoteDataReplication/DisasterRecovery NEC Storage RemoteDataReplication/DisasterRecovery

ReplicationControl NEC Storage ReplicationControl

SnapControl NEC Storage SnapControl

Description Corresponding Product

5. The following descriptions in the text of this manual refer to the corresponding manuals.

Description Corresponding Manual

User's Manual (UNIX) NEC Storage Manager User's Manual (UNIX) (IS001)

User's Manual NEC Storage Manager User's Manual (IS004)

Configuration Setting Tool User’s Manual (GUI)

Data Replication User’s Manual (Installation and Operation Guide for Windows)

Data Replication Command Reference

NEC Storage Manager Configuration Setting Tool User’s Manual (GUI) (IS007)

NEC Storage Manager Data Replication User’s Manual (Installation and Operation Guide for Windows) (IS016)

NEC Storage Manager Data Replication Command Reference (IS021)

Description Corresponding Product

Data Replication User’s Manual (Disaster Recovery System Installation and Operation Guide)

Snapshot User’s Manual (Function Guide)

6. Trademarks and registered trademarks

• Microsoft® and Windows® are trademarks or registered trademarks of Microsoft Corporation in the

United States and other countries.

• HP-UX is a registered trademark of Hewlett-Packard Co. in the United States.

• UNIX is a registered trademark of The Open Group in the United States and other countries.

• VERITAS, VxVM, VxFS, NetBackup, VERITAS Volume Manager, VERITAS File System, and

VERITAS NetBackup are trademarks or registered trademarks of VERITAS Software Corporation in

the United States and other countries.

• Legato NetWorker is a registered trademark of Legato Systems, Inc. in the United States.

• Sun is a registered trademark of Sun Microsystems, Inc. in the United States and other countries.

• Solaris is a trademark or a registered trademark of Sun Microsystems, Inc. in the United States and

other countries.

• Linux is a trademark or registered trademark of Mr. Linus Torvalds in the United States and other

countries.

• AIX is a trademark of IBM Corporation.

Other product names and company names, etc. are trademarks or registered trademarks of the

associated companies.

7. In this document, matters to which careful attention needs to be paid will be described as follows:

Be sure to observe the contents.

If the indications are ignored and the system is improperly operated, settings which have been already

made might be affected.

NEC Storage Manager Data Replication User’s Manual (Disaster Recovery System Installation and Operation Guide) (IS027)

NEC Storage Manager Snapshot User’s Manual (Function Guide) (IS030)

Type of Indication

Type Description

Describes contents which require special attention during operation.

The First Edition in March 2003

The Ninth Edition in November 2004

Chapter 1 Data Replication Overview

To manage an enormous amount of information accumulated in business in a unified way and promote effective

and efficient utilization of the information, a high-throughput, large-capacity, and high-reliability storage system is

required. Data Replication provides functions to build and manage such a storage system.

This chapter describes overview of Data Replication, hardware configuration, and software configuration.

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Data Replication is a function that creates Replication Volumes (RV) of a business volume (called

Master Volume (MV) in the data replication). It is installed in the disk array. Replication volumes

can be connected to or separated from the master volume at any time. Operations such as connection

and separation can be instructed from the business server and the iSM Client (e.g. Windows system).

The following two methods are provided to create replication volumes.

(1) Creating replication volumes within the same disk array (DDR: DynamicDataReplication)

(2) Creating replication volumes in different disk arrays (RDR: RemoteDataReplication)

Synchronize/Separate

Master Server

Operation

Master

(MV)

Replication

(RV)

DynamicDataReplication

Master

(MV)

Figure 1-1 Data Replication

Production Task

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Parallel Processing

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Chapter 1 Data Replication Overview

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When you introduce Data Replication and use replication volumes which can be separated, you can get

the following benefits.

• The system down time during data backup is largely reduced. Lowered access performance to the

business database during data backup in system operation can be prevented.

• A test environment using the actual business data can be built more easily.

• Processing becomes more efficient due to parallel processing of data update tasks and data reference

tasks.

In this way, Data Replication makes system construction and system management easier and more

effective.

The following sections illustrate some applications of Data Replication.

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This section describes an application for backup using replication volumes.

[Backing Up from the Replication Volume to Magnetic Tape Media]

In this method, a replication volume of the master volume is backed up to the magnetic tape.

In this case, operations are suspended only for the time it takes to separate replication volumes from the

master volume. Therefore, the suspension time can be substantially reduced.

Because backup is done from the replication volume, it does not affect the master volume.

Master Serve

Production Task

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Backup Serve

Maste

(MV)

Backup

Separate

Replication

(RV)

Figure 1-2 Backup from Replication Volume

Tape

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Chapter 1 Data Replication Overview

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The procedure for backup from a replication volume is described below.

(1) During operation, the master volume (MV) and replication volume (RV) are connected.

(2) Suspend the production task and separate the replication volume (RV). Resume the task after

separation is complete.

(3) Use the separated replication volume (RV) to perform backup and the task in parallel. After

backup is complete, reconnect the replication volume (RV) (Reconnection takes only a short time

because only updated parts in the master volume are reflected to the replication volume (RV)).

[Using the Replication Volume as Disk Backup]

In this method, the replication volume is used as backup of the master volume. In this case, you do

not have to manage the existing magnetic tapes because they are not used as storage media.

When the restoration instruction is complete, you can use the backup data even if the actual data

replication has not been completed. If data to be accessed is not restored to the master volume, the

data in the replication volume is accessed. The user does not have to be aware of using which of the

master volume or replication volume.

This reduces the data restoration time substantially.

Connect

Maste

(MV)

Separate

The procedure for using a replication volume for backup is described below.

(1) Connect the replication volume 1 (RV1) to the master volume.

(2) Suspend the production task and separate the replication volume 1 (RV1). Resume the task after

connecting the replication volume 2 (RV2).

(3) After that, use the replication volume 1 (RV1) and replication volume 2 (RV2) alternately to

perform backup.

Replication 1

(RV1)

Maste

(MV)

Replication 2

(RV2)

Figure 1-3 Using Replication Volume as Backup

Separate

Connect

Replication 1

(RV1)

Replication 2

(RV2)

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Chapter 1 Data Replication Overview

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You can set the same environment as the production task environment easily by creating replication

volumes using the Data Replication function. You can evaluate an application program by using data

used in the production task, which makes evaluation of application programs more efficient.

Furthermore, in building an evaluation environment, operations are suspended only for the time which

takes to separate replication volumes from the master volume. Therefore, the suspension time can be

substantially reduced.

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The procedure for using a replication volume as a test environment is described below.

(1) Connect the master volume (MV) and replication volume (RV).

(2) Suspend the production task, separate the replication volume (RV), and then resume the task.

(3) Perform evaluation of the application program by using the separated replication volume (RV).

Replication

(RV)

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Figure 1-4 Test Environment Setting

Separate

Replication

(RV)

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Chapter 1 Data Replication Overview

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By creating replication volumes of the master database, you can separate the database and carry out

update tasks and search tasks using different volumes. This allows you to carry out database update

tasks without affecting database search tasks.

Nighttime

Master

(MV)

Master

Database

The procedure for parallel processing of search operation is described below.

(1) In the nighttime, suspend search tasks and connect the master volume (MV) and replication

(2) In the daytime, separate the master volume (MV) and replication volume (RV). Then perform

Connect

volume (RV).

update tasks and search tasks in parallel (RV contains data for the prior day).

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Reflection of

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Figure 1-5 Parallel Processing of Search Task

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Chapter 1 Data Replication Overview

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ReplicationControl

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• DynamicDataReplication

• RemoteDataReplication

Disk Array

Figure 1-6 System Configuration

To install and use the Data Replication function, the following hardware devices are required.

• Disk array

Disk arrays on which the Data Replication function either with DynamicDataReplication or

RemoteDataReplication is installed are required.

• Management server

iSM is installed in the management server that monitors disk arrays. This server controls disk arrays

and the Data Replication function.

• Business server/backup server

Performs Data Replication operation or backup operation in cooperation with business.

Software to run Data Replication consists of the following components.

Backup Server

Backup Software

Tape Drive

ReplicationControl

Management

Server

Replication

LAN

Storage Manager

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Chapter 1 Data Replication Overview

• Storage Manager

Provides the disk array configuration and state display functions.

Installing DynamicDataReplication and/or RemoteDataReplication allows the replication

management function (hereinafter, referred to as the Replication Management) incorporated in iSM.

The Replication Management provides setting and operating functions such as state display, pair

setting, and replication operation for DynamicDataReplication or RemoteDataReplication.

• ReplicationControl

Provides commands for checking replication operations and replication states from the business

server and also provides library functions.

• AccessControl

The function to set the logical disks that can be accessed, for each business server.

• DynamicDataReplication

The function to realize data replication within the same disk array.

• RemoteDataReplication

The function to realize data replication in the different disk arrays.

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Chapter 2 Data Replication

This chapter describes the types and state transitions of volumes that are necessary to perform operation using the

Data Replication function.

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To create replication volumes using the Data Replication function, you must set the relation between

the original volume and the target volume (replication volume) first. In replication control, the

original volume is called MV (Master Volume), and replication volume is called RV (Replication

Volume). Furthermore, MV and RV are set as a pair.

In a disk array to which the Data Replication function is installed, the volume classification in the disk

array is categorized into the following three types. Figure 2-1 describes sample volume classification.

• Isolated Volume (IV)

Volume with no pair setting.

By specifying the pair setting to IV, you can set it to MV or RV.

• Master Volume (MV)

Volume with the pair setting. The original volume in the pair. Normally, volumes used in

operation are set as MVs.

To distinguish the uppermost MV from other MVs when multiple pairs are set in series hierarchically,

it is called the Primary Volume (PV).

• Replication Volume (RV)

Volume with the pair setting. The target volume in the pair. Normally, volumes used as backup or

in test operation are set as RVs.

The pair setting can be between the volumes within the same disk array, or between the volumes in

different disk arrays. To distinguish them, the former is called a Dynamic Replication Volume

(dRV) and the latter is called a Remote Replication Volume (rRV).

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Chapter 2 Data Replication

Volume A1/A2/B1 : IV

Volume A3 : MV (PV) of the pair A3/A4

Volume A4 : RV (dRV) of the pair A3/A4, and MV of the pair A4/B2

Volume B2 : RV (rRV) of the pair A4/B2

Disk Array A Disk Array B

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B2

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(rRV)

Pair Setting

Figure 2-1 Example of Volume Classification

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Chapter 2 Data Replication

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The replication operations include Replicate that replicates data from MV to RV, Separate that

separates between MV and RV, and Restore that replicates data from RV to MV.

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This operation copies data from MV to RV.

It is performed to replicate the latest data to the replication volume used in a test environment or search

tasks. When Replicate is executed, the data in MV is copied to RV. In addition, any update made to

MV after Replicate is reflected to RV.

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This operation separates MV and RV.

It is performed to suspend data replication between MV and RV to use RV in a test environment or

search tasks.

When Separate is started, all the difference between the MV and RV contents at the point of starting

Separate is reflected into the RV, and then data replication is suspended and the RV is separated. The

updates made to MV after starting Separate are not reflected to RV and stored in the disk array as

update differences.

When executing Separate, you can determine when to make the RV available by choosing either of the

following:

• Separate for making RV available after completion of separation: Separate(completion)

Reflects all the difference between the MV and RV contents into the RV, and makes the RV available

after completion of separation.

Even though Separate is executed immediately after Replicate starts, RV cannot be used while the

difference between MV and RV is being reflected to RV. RV becomes available upon completion

of separation.

• Separate for immediately making RV available: Separate(immediate)

While reflecting the difference between the MV and RV contents into the RV, the Separate function

makes the RV available even during separation. You can instantly create RV and make it available

by executing Separate(immediate).

This function is available only for performing data replication in the same disk array. The product

“DynamicDataReplication Ver2“ is necessary for using the function.

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Chapter 2 Data Replication

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This operation copies data from RV to MV.

It is performed to restore data from the backup volume (RV) when a failure occurs in MV.

When Restore is executed, the RV contents at the point of starting Restore are reflected copied into the

MV. At this time, you can determine whether to reflect the updated data of the MV into the RV by

choosing either of the following:

• Restore with RV being updated: Restore(update)

Restores the MV while automatically reflecting the updated data of the MV into the RV. Even after

the difference between MV and RV is resolved and Restore is completed, any data update made to

MV is reflected to RV.

• Restore without RV being updated: Restore(protect)

Restores the MV without reflecting the updated data of the MV into the RV. After the difference

between MV and RV is resolved and Restore is completed, Separate is automatically executed. The

Restore(protect) function enables you to save the RV data in the state before the restoration.

The product DynamicDataReplication Ver2 or RemoteDataReplication Ver2 is necessary for using

the function.

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This section describes the replication operations and state transitions.

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The pair setting is specified but MV and RV are separated.

separated

• MV and RV can be updated.

MV RV

Difference between MV and RV is being reflected.

MV

Replicate

• RV cannot be updated.

rpl/exec

sep/exec

Separate

• As a rule, RV cannot be updated.

rst/exec

Restore

• RV cannot be updated.

MV

RV

The pair setting is specified and synchronization has been established.

sync

Updates to MV are reflected to RV.

• As a rule, access to RV is not allowed.

rpl/sync

MV RV

rst/sync

When Restore(update) is

executed, updates to MV are reflected to RV.

• When Restore(protect) is executed, updates to MV are not reflected to RV.

• As a rule, access to RV is not allowed.

exec : Executing Replicate, Separate, or Restore sync : Replicate or Restore synchronization state rpl : replicate (Replicate)

rpl/exec ............. Executing synchronization

rpl/sync ............. Synchronization state

sep : separate (Separate)

sep/exec ............ Executing Separate

separated .......... Separate completion state

rst : restore (Restore)

rst/exec ............. Executing Restore

rst/sync ............. Synchronization state

Figure 2-2 Replication Operations and State Transitions

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When Restore(protect) is executed,

Synchronous State (rst/sync) is placed and then automatically changed to Separated State (separated).

Chapter 2 Data Replication

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When Replicate is performed, data copy from MV to RV starts to reflect the content of MV to RV.

Any update to MV after Replicate is also reflected to RV.

After Replicate is started, the difference between MV and RV gradually decreases, and eventually the

content of MV at the beginning of Replicate is completely reflected to RV (The difference is zero).

The state from the beginning of Replicate to the content of MV is completely reflected to RV is called

the “Replicate execution”. The state where the difference between MV and RV is zero is called the

state synchronized by Replicate, or simply the “synchronous state“. Replicate execution and the state

synchronized by Replicate are collectively called the Replicate state.

Update to MV

Replicate

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RV

operation

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Update to MV

MV

RV

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Figure 2-3 Replicate and State Transitions

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Chapter 2 Data Replication

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When Separate is performed, the difference between MV and RV at the time of executing the Separate

start instruction is reflected to RV and RV is separated. No update to MV after Separate is reflected to

RV.

After Separate is performed, data copy to RV is performed if the contents of MV and RV at the

beginning of Separate do not match, and all updates to MV before the Separate start instruction are

reflected to RV. The state from the beginning of Separate to the content of MV at the beginning of

Separate is completely reflected to RV is called the “Separate execution state“. The state where all

updates to MV are reflected to RV is called the state separated by Separate, or the “separated state“.

Separate execution and the separated state are collectively called the Separate state.

When Separate is executed under specification of immediate use of RV (Separate(immediate)), the RV

contents can be referred to or updated immediately after the Separate start instruction is issued,

regardless of whether or not all the MV contents have been reflected into the RV. This feature is

implemented as follows.

When an update/reference request for the RV is made and access to an area where difference copy from

the MV into RV is not completed is to be made, control is performed for copying the difference from

the MV into RV before permitting access to the area.

The updates made to MV until Separate is started are reflected to RV. The updates made to MV after

Separate is started are not reflected to RV and managed as update difference.

The updated states of MV and RV are managed in Separate State so that the difference between the MV

and RV contents is reflected when Replicate/Restore is executed.

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Until the difference between MV and

Synchronous State

MV

RV

Separate operation starts

Separate Execution

Figure 2-4 Separate and State Transitions

MV

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RV is fully reflected to RV

Separated State

Separate State

MV

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Chapter 2 Data Replication

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When Restore is performed, data copy from RV to MV starts to reflect the content of RV at the

beginning of Restore to MV. When Restore(update) is executed, any update to MV after Restore is

also reflected to RV.

After Restore is started, the difference between MV and RV gradually decreases, and eventually the

content of RV at the beginning of Restore is completely reflected to MV (The difference is zero). The

state from the beginning of Restore to the content of RV at the beginning of Restore is completely

reflected to MV is called the “Restore execution”. The state where the difference between MV and

RV is zero is called the state synchronized by Restore, or simply the “synchronous state“. Restore

execution and the state synchronized by Restore are collectively called the Restore state.

When Restore(protect) is executed, the updated data of the MV is not reflected into the RV. In this

case, the updated information of the MV is managed as the difference between the MV and RV contents

so that the difference can be reflected into the RV when Replicate/Restore is executed subsequently.

When the Synchronous State (sync) is placed after Restore(protect) is executed, it is automatically

changed to the Separated State (separated).

When data of MV is referred to during Restore execution, the user can refer to the content of RV

immediately after the instruction to start Restore even if the content of RV has not been completely

reflected to MV. This is done by obtaining data from RV when the area where difference copy from

RV to MV has not been completed is accessed in response to a reference request to MV.

Update to MV

MV

RV

Separate State

Restore operation starts

Update to MV

MV

RV

Restore Execution

Until the difference is zero

Only when updating RV

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Figure 2-5 Restore and State Transitions

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Chapter 2 Data Replication

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In data replication, Replicate, Restore, and Separate states are called “activity states”, or simply

“activities”.

The execution states indicating state transitions and the state in which the state transition is complete

are called “synchronous states”.

Table 2-1 shows the activity states and synchronous states which transit as a result of each replication

operation. For information on handling MV and RV access in the activity states, refer to 2.6 “RV

Access Restriction”.

Activity State Synchronous State Description

Separate State

Replicate State

Restore State

Separate Execution (sep/exec)

Separated(separated)

Forced Separate(cancel)

Failure Separation (fault)

Synchronous Execution (rpl/exec)

Synchronous State(rpl/sync)

Restore Execution(rst/exec)

Synchronous State(rst/sync)

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Table 2-1 Activity State and Synchronous State

• Temporal state until the difference between MV and RV

• As a rule, read and write to RV are not allowed.

• Data copy between MV and RV is not performed. This

• Normally, read and write to RV are allowed.

• MV and RV are forcibly separated by Forced Separate.

• Read and write to RV are allowed.

• MV and RV are forcibly separated in the disk array due

• Read and write to RV are allowed.

• Reflection of the difference between MV and RV at

• Updates to MV is reflected to RV.

• As a rule, read and write to RV are not allowed.

• Reflection of the difference between MV and RV at

• Updates to MV is reflected to RV.

• As a rule, read and write to RV are not allowed.

• Reflection of the difference between MV and RV at

• When Restore(update) is executed, the updated data of

• When Restore(protect) is executed, the updated data of

• As a rule, read and write to RV are not allowed.

• Reflection of the difference between MV and RV at

• When Restore(update) is executed, the updated data of

• When Restore(protect) is executed, the updated data of

• As a rule, read and write to RV are not allowed.

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becomes zero after Separate

state occurs immediately after the pair setting.

to a copy fault.

Replicate has not been completed (The difference is being reflected from MV to RV).

Replicate has been completed.

Restore has not been completed (The difference is being reflected from RV to MV).

the MV is reflected into the RV.

the MV is not reflected into the RV.

Restore has been completed.

the MV is reflected into the RV.

the MV is not reflected into the RV and the Separate completion state is automatically entered.

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If the activity between volumes with the pair setting is the Replicate or Restore state, you can change the

copy method of data between MV and RV according to the load status of the disk array. The state to

which a transition is made by the instruction to change the copy method is called the “copy control state“.

There are the following two types of copy between MV and RV in the Replicate or Restore state.

• Copy for reflecting difference

Copy to reflect the content of MV (RV for Restore) at Replicate or Restore to RV (MV for Restore).

• Copy to reflect updates in MV to RV

Copy to reflect updates in MV to RV after Replicate or Restore. However, if Restore(protect) is

executed, the updated data of the MV is not reflected into the RV.

You can change the copy method and state by changing the copy control state.

There are the following copy states in the copy control states as shown in Table 2-2.

Copy Control State Copy State

Foreground Copy

Background Copy -

Suspend

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Suspend due to a failure

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Table 2-2 Copy Control State

Chapter 2 Data Replication

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• Copy for reflecting difference is performed.

• Updates to MV are reflected RV sequentially.

• Copy for reflecting difference is performed.

• I/O of updates to MV is completed when data is written to MV,

and the data is copied to RV immediately after that.

• Can be set for a RemoteDataReplication pair.

• Copy for reflecting difference is performed.

• I/O of updates to MV is completed when data is written to MV,

and the data is accumulated as difference information. For the accumulated difference, data is copied to RV asynchronously. The copy interval to RV (Background Copy Level) can be changed in units of disk arrays.

• Copy for reflecting difference is not performed.

• I/O of updates to MV is completed when data is written to MV,

and the data is accumulated as difference information. Reflection to RV is not performed.

• Forcefully suspended in the disk array due to a copy fault.

• Copy for reflecting difference is not performed.

• I/O of updates to MV is completed when data is written to MV,

and the data is accumulated as difference information. Reflection to RV is not performed.

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Chapter 2 Data Replication

py

Copy control states can be specified when Replicate or Restore is performed. You can also change the

copy control state you specified at Replicate or Restore as required.

When Restore with RV protection specified is executed, only copy for reflecting the difference is

executed, thus the updated data of the MV is not reflected into the RV. Therefore, specifying or

changing a copy control state (Synchronous Copy Mode, Semi-synchronous Copy Mode, or

Background Copy) has no effect.

There are the following five instructions to change the copy control state.

• Synchronous Copy instruction

• Semi-synchronous Copy instruction

• Resume instruction

• Background Copy instruction

• Suspend instruction

The Resume instruction changes Background Copy or Suspend to preceding Foreground Copy

(Synchronous Copy Mode, Semi-synchronous Copy Mode).

Figure 2-6 shows the state transition diagram of the copy control states.

Background Copy

Background

Copy Instruction

Foreground Copy

Sync Copy

Mode

Synchronous Copy or

Semi-synchronous

Copy or Resume

Background Copy Instruction

Suspend Instruction

Semi-

synchronous

Mode*

Co

Suspend Instruction

Copy Fault

* Semi-synchronous Copy Mode

can be used only for a RemoteDataReplication pair

Synchronous Copy or Semi-synchronous Copy or Resume Instruction

Suspend

normal abnormal

Figure 2-6 State Transition Diagram of Copy Control State

18

Chapter 2 Data Replication

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If the copy control state is set to the Synchronized Copy state, the difference between MV and RV is

not accumulated because updates to MV are immediately reflected to RV. However, the write time to

MV is longer because it waits for reflection of the updates to RV. If the Copy Control state is set to

the Suspend state, the difference between MV and RV is accumulated because updates to MV are not

reflected to RV, but the write time to MV is the same as normal I/O.

In this way, there are correlations between the amount of accumulated differences in MV and RV and

write performance in different copy control states. The correlation for each copy control state is

shown in Table 2-3.

Copy Control State Difference between MV and RV Write Overhead to MV

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Foreground (Synchronous) Small Exists

Foreground (Semi-synchronous)

Background

Suspend Large Does not exist

If the difference between MV and RV is large in the Replicate state, we recommend to select a copy

control state which gives the difference between MV and RV smaller in a system without sufficient

suspension time for Separate execution because the processing time of Separate increases. Also, we

recommend you to select a copy control state without write overhead to MV in a system where write

performance to MV must be maintained and improved.

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Chapter 2 Data Replication

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In the Replicate state and Restore state, MV is synchronized with RV to always match the volume data

between MV and RV. Since the difference between MV and RV is reflected in the disk array

independently of the operating system or file system, however, the volume of RV may become

inconsistent. Therefore, the data replication function cannot impose access restrictions for MV, and

MV can be referred to and updated at any time. The function can impose access restrictions for RV

for activity state to prevent malfunction.

Table 2-4 shows the states which can be specified as RV access restrictions.

Access Restriction Description

Read/Write (R/W) RV is enabled for read/write.

Read Only (RO) RV is enabled only for reading.

Not Ready (NR) RV is disabled for read/write.

RV is not recognized by the

Not Available (NA)

operating system or the LU (Logical Unit) is invalid.

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rpl rst sep/exec separated

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Note 2 ∆ Note 2 ∆ Note 2 ∆ Note 3

{ { {

∆

Note 4 ∆ Note 4 ∆ Note 4 ∆ Note 4

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Activity State

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{: Available ∆: Available with administrative restrictions -: Unavailable

rpl: Replicate state RW: Read/Write

rst: Restore state RO: Read Only

sep/exec: Separate execution NR: Not Ready

separated: Separated state NA: Not Available

Note 1: For Separate(immediate), “Read/Write (RW)” is set even during execution of Separate.

However, keep the following operational influence in mind:

1. Data is being copied from the MV into RV during Separate execution. Therefore, if the

I/O load on the RV is high, I/O performance on the MV side may lower.

Note 2: You can set “Read Only (RO)” to RV in the Replicate state, Restore state, or Separate

execution. In this case, note the following.

1. No update to MV should be done when RV is referred to in the Replicate state or Restore

state.

2. For updates to MV, I/O processing is done to the disk by the operating system control of

the file system. Even if the application has completed the update process to the disk, it

has not necessarily completed the update process to MV. Reflection of the update to RV

is processed in the disk array independent of the operating system.

Therefore, RV cannot be referred to normally because it is not consistent as a volume.

You can use it if consistency is assured in the specific operation.

20

Chapter 2 Data Replication

Note 3: If “Read Only (RO)” is set for RV for which Separate was completed, keep the following

operational notes in mind.

1. If NTFS is used as a file system, reference to the RV is disabled.

2. If FAT16/FAT32 is used as a file system, associate the file system with the drive by using

the mount command of the disk control operation commands or by starting [Disk

Management] (Windows).

3. If FAT16/FAT32 is used as a file system, an attempt to write to RV ends up with an error.

Therefore, do not use any application for automatically performing write operation for the

drive. Do not perform any operation (e.g., changing of a partition configuration) in

which write to RV is performed through [Disk Management] (Windows).

When mounting a file system, it is necessary to mount it by a read-only specification.

Note 4: The “Not Available (NA)” state has meaning when the VSS (Volume Shadow copy Service)

function is used. A transition to the Not Available state is automatically controlled by the

VSS function. The user need not perform the operation normally.

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If copy operation between MV and RV is not performed normally due to a connection failure between

them, a transition to the following states may occur depending on the timing and type of the failure.

• Separate state due to a fault (failure separation)

Forcefully separated in the disk array due to a copy fault. The contents of MV and RV are

completely different.

To cancel the Separate state due to a failure, remove the cause of the copy fault and perform

restoration by using Replicate and Restore.

• Suspend state due to a fault (abnormal suspend)

Forcefully suspended in the disk array due to a copy fault in the Replicate or Restore state. Copy

between MV and RV is suspended.

To cancel the Suspend state due to a failure, change the copy control state as you do to cancel the

normal Suspend state after removing the cause of the copy fault (Refer to 2.4 “Copy Control State”).

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Chapter 2 Data Replication

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If the power to the disk array is turned off for maintenance, access to the disk array is disabled,

disallowing to continue copy operation for the paired volumes in the disk array. In this situation, the

data replication function for the disk array stops replication operations of the whole disk array.

Freezing of replication operations for the disk array due to power down of the disk array is called

freezing of the disk array and the state is called the freeze state of the disk array.

When a disk array is in the freeze state, replication operations between volumes to which the pair

setting with the volume in the disk array is specified are also suspended, and the copy control state of

the pair becomes the freeze state.

When the pair is in the freeze state, no new replication operation can be performed.

For pairs in the freeze state, note the following.

• Freeze in the Separate state

If the pair goes into the freeze state in Separate execution, it transits to the Separate state due to a fault

(failure separation) when the following operation is performed.

In this case, to use RV after the freeze state is cancelled, you must perform Replicate again to copy

data, and perform Separate.

• Freeze in the Replicate state

If the pair goes into the freeze state in the Replicate state, copy operation between MV and RV is

suspended. Copy operation is automatically resumed when the freeze state is cancelled.

• Freeze in the Restore state

If the pair goes into the freeze state in the Restore state, I/O terminates abnormally when reference or

update is performed to the area where copy from RV to MV has not been completed.

If the pair goes into the freeze state in the restored state, copy operation between MV and RV is

suspended.

Copy operation is automatically resumed when the freeze state is cancelled.

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Chapter 3 Replication Management

This chapter describes various operations of Data Replication by the Graphical User Interface (GUI).

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This chapter describes an overview of various operations and the management method regarding data

replication that uses the replication management function.

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Use the following functions to perform operations related to Data Replication through the iSM Client:

• State Monitoring

• Replication manager

• Configuration setting

Since operations performed from Replication manager includes important operations on volumes, the

operating authorization is set according to the following allowance levels.

However, when the server is disconnected by State Monitoring after displaying the Replication screen,

only the currently displayed state (the information gained while the server was connected) can be

referenced regardless of the operation authorization.

• L1: Allows only reference.

• L2: Allows replication-related operations (copy operations) in the administration level.

• L3: Allows all operations.

For information on how to set and log in, refer to the “User’s Manual” or “User’s Manual (UNIX)” in

accordance with your OS.

23

Chapter 3 Replication Management

Table 3-1 lists the operations and state displays.

Table 3-1 List of Displays/Operations of Data Replication

Replication Management

Operation Item

Set Disk Array Name √ √ √ - - Set Logical Disk Name √ √ √ - - Link State - - √ - - Pair Setting/Unpair - - √ - - √ Replicate - - √ - √ √ Separate - - √ - √ √ Restore - - √ - √ √ Suspend/Resume Copy - - √ - √ √ Change to Background Copy - - √ - √ √ RV Mode Change - - √ - √ √ Forced Separate - - √ - √ √ Forced Unpair - - √ - - √ Freeze/Defreeze - - √ - - √ Background Copy Level Change - - √ - - √ Pair Batch Setting - √ - - - -

State

Monitoring

Configuration

Setting

Display

Operation Authorization

L1 L2 L3

√: Available - : Not available

L1: Allows only reference.

L2: Allows replication-related operations (copy operations) in the administration level.

L3: Allows all operations.

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Events that occur in response to various operations performed on disk arrays and volumes can be

detected by the state monitoring and displayed in the iSM Client’s message display area as operation

messages.

By executing an environment setting beforehand, it is possible to detect events that occur as the result

of executing replication operation commands or other operations as well as performing replication

management operations, and it is also possible to confirm the events from operation messages.

Table 3-2 shows the replication-related events that can be confirmed as operation messages:

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Table 3-2 List of Replication-Related Events

Operation Target Operation

Disk array

Freeze

Chapter 3 Replication Management

Replication Management

Operation

{

Other Operations

∆

Defreeze

Change Background Copy level

Volume

{: Regular report ∆: Additional report performed according to an environment setting −: Not reported

Pair Setting/Unpair

Replicate

Synchronous State (rpl/sync)

Separate

Separated

Restore

Synchronous State (rst/sync)

Suspend/Resume Copy

Change to Background Copy

Change RV Mode

Change Copy Mode

Note: Replication management operations include operations performed together with the

ReplicationControl commands.

Regarding S2100 and A2100, the detection of events other than pair setting and unpairing events

may not be possible during the state monitoring.

Furthermore, the state monitoring monitors all the disk arrays’ volumes for a specified time

interval (default: 15 seconds) to detect events. Therefore, there is a time difference between

when an event actually occurred and when a message is output. Also, messages for each

detected event are displayed at the same time.

For information about an environment setting regarding the state monitoring’s event detection

time interval and operation message output control, refer to the “User’s Manual” or “User’s

Manual (UNIX)” in accordance with your OS.

{

∆ ∆

{

∆ ∆

{

∆ ∆

{

∆

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Chapter 3 Replication Management

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Note the following points when operating replication management:

[System Parameter Setting (on UNIX)]

For more information, refer to the “User’s Manual (UNIX)”.

[Messages at Start]

Immediately after iSM is started, replication-related device information is created internally.

Replication-related device information is recreated according to an information recreate instruction

from ReplicationControl.

Even if an attempt is made to display the Replication Screen at this timing, the screen cannot be

displayed because the device information cannot be obtained. If this happens, retry to display the

screen after a while.

[Action to Be Taken at Occurrence of Problems]

Refer to dialogs (messages) or help to take appropriate action.

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To perform an operation, select the volumes you want to perform the operation to in the Volume List

Displayed on the Replication Information tab in the Replication Screen, and then click the [menu] on

the menu bar. You can also right-click the volume to display the menu.

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The Replication Screen consists of the configuration display area (i) on the left part of the screen

displaying the configuration and state of the disk array and the information list display area (ii) on the

right part of the screen displaying the Volume List and disk array link configuration. When the

Replication Screen appears for the first time, it contains only the configuration display area (i) and the

information list display area (ii) is displayed by clicking the disk array icon. The information list

display area (ii) shows the selected disk array and the Volume List of the disk array connected with the

selected disk array by RemoteDataReplication.

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Figure 3-1 Example of Replication Screen

(i) For details, refer to 3.2.2 “Configuration Display Area”.

(ii) For details, refer to 3.2.3 “Replication Information Screen” and 3.2.4 “Disk Array LINK

Information Screen”.

* For details on the AT-group information screen, refer to the “Data Replication User’s Manual

(Disaster Recovery System Installation and Operation Guide)”.

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The configuration display area is under the monitoring by the iSM and displays the list and the state of

the Disk Arrays that can use the Replication function, as well as the status of link among them.

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Figure 3-2 Example of Configuration Display Area

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Disk Array icon

Icon Description

Chapter 3 Replication Management

, , , etc.

(in colors)

,

(dark gray)

, , , etc.

(light gray)

A disk array on which neither the DynamicDataReplication nor the RemoteDataReplication is installed

does not appear on the screen.

Indicates that the disk array is normally operating.

Indicates that the license capacity of the DynamicDataReplication, RemoteDataReplication, or RemoteDataReplication/DisasterRecovery is insufficient.

* If license capacity is insufficient, you cannot execute pair setting/unpair.

Indicates that the fault occurs in any link path between disk arrays.

Indicates that the copy fault or the fault in all link paths between disk arrays occurs.

Indicates that the data replication function is frozen.

Indicates that the disk array to be linked is not directly monitored by Replication manager when a link is established between disk arrays.

Indicates that the state monitoring is stopped.

If the Replication does not recognize the disk array of the link destination when the link is

established between disk arrays, the disk array name may be displayed as the address value

(Subsystem Absolute Address), which can uniquely identify the disk array not duplicated with other

disk arrays.

Each information screen to be explained in the following page or later may not be displayed depending

on the display items selected in the configuration display area and the state of disk array as follows.

Tabs in the information list display area cannot be selected when “iSM server” specified in the

configuration display area.

[Disk Array LINK Information] tab cannot be selected when the following disk arrays specified in the

configuration display area.

• Disk arrays not supporting RemoteDataReplication

• Disk arrays without RemoteDataReplication license

• Unmanaged disk arrays

[ATgroup Information] tab cannot be selected when the following disk arrays specified in the

configuration display area.

• Disk arrays not supporting RemoteDataReplication and RemoteDataReplication/Disaster Recovery

• Disk arrays without RemoteDataReplication and RemoteDataReplication/Disaster Recovery

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license

• Unmanaged disk arrays

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When click the [Replication Information] tab in the information list display area, the volume

information of the volumes in the selected disk array is displayed (refer to Figure 3-3 “Example of

Replication Information Screen”).

MV and RV are displayed in one line respectively (a total of two lines) for a pair and IV is displayed in

one line. If pair setting is performed for volumes, the states of the volumes are displayed in two lines

for one pair so as to check the states of MV and RV. IV is displayed in one line. To perform sort,

click the item name by which you want to sort. You can drag&drop an item to permute the order of

the items.

When pair setting and unpairing are performed, volume information is updated according to the order of

the last sort.

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Figure 3-3 Example of Replication Information Screen

The Replication Information screen displays information regarding the following items.

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(i) Classification

The volume types (volume attributes) are displayed.

Displayed Icon Description

(Green)

(Light Blue)

(White)

When the snapshot function is used, the base-volume (BV) used by snapshot is also displayed.

For snapshot, refer to the “Snapshot User’s Manual (Function Guide)”.

Displayed Icon Description

(Green)

(White)

(ii) Number

The logical disk number is displayed in hex digit.

It is the same as the logical disk number shown in the main screen (State Monitoring screen).

(iii) OS Type

Indicates the volume format.

When performing Replication operations, the OS type must be correctly specified.

Display Description

MV. Indicates Master Volume which is the volume of replication origin.

RV. Indicates Replication Volume which is the volume of replication target.

IV. Indicates Isolated Volume and is the volume except the replication object. IV becomes MV or RV by operating pair setting.

Indicates the volume on which a copy fault occurs.

MV (MV/BV) having the BV attribute. Indicates the volume of replication origin.

IV (BV) having the BV attribute. Indicates a volume which is not a replication object. BV becomes MV (MV/BV) by operating pair setting.

A2 Indicates ACOS-2 format volume

A4 Indicates ACOS-4 format volume

AX Indicates AIX format volume

CX Indicates Solaris format volume

LX Indicates Linux format volume

NX Indicates HP-UX format volume

WN Indicates Windows format volume

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(iv) Logical Disk Name

The identification name or identifier (see Note

It is the same as the logical disk name displayed in the main screen (State Monitoring screen) and

can be changed from the main screen (State Monitoring screen).

When the events given below have occurred when displaying the Replication Information screen, the

“Logical Disk Name” or “Paired Disk Name” field may show the unique volume number (Volume

Absolute Address) managed inside the disk array.

• The link failure has occurred.

• The Disk Array on the remote side is not managed by iSM or is in monitoring-stop state.

These events occur in a pair connected by RemoteDataReplication when the host to which a local

volume is connected cannot recognize the volume on the remote side. Also in such a case,

operations such as Forced Separate and Forced Unpair for local volumes are enabled.

) given for the logical disk is displayed.

(v) Pair Number

The logical disk number of paired volume is displayed in hex digit.

(vi) Pair Disk Name

The logical disk name of paired volume is displayed.

(vii) Activity State

The replication operation status is displayed.

Display Description

Replicate Indicates the status that copy is executing from MV to RV.

Separate Indicates the disconnection status of MV to RV.

Restore Indicates the status that copy is executing from RV to MV.

Restore (protect)

Indicates the state in which data is being copied from the RV into MV but the updated data of the MV is not reflected into the RV.

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(viii) Disk Array

The identification name given to the Disk Array including the volume indicated by “Pair Number”

is displayed.

It is the same as the Disk Array Name displayed in the main screen (State Monitoring screen), and

can be changed from the main screen (State Monitoring screen).

If the Replication does not recognize the link destination of the disk array when the link is

established between disk arrays, the disk array name may be displayed as the address value

(Subsystem Absolute Address), which can uniquely identify the disk array not duplicated with other

disk arrays.

(ix) Sync State

The transition status in activity state is displayed.

For more information, refer to 2.3 “Replication Operations and State Transitions”.

Display Description

Separating

Separated

Forced Separation

Fault

Sync Execution Indicates the status that difference exists while copy is executing.

Synchronized

Restoring

Restored (synchronized)

Indicates the temporary status that difference between MV and RV is reducing to zero during Separation Execution.

Indicates the status that the data copying is not processing between MV and RV. It becomes this status right after pair setting.

Indicates the status that MV and RV are separated forcibly by the forced separate instruction.

Indicates the status of forced separation inside the disk array due to copy fault occurrence.

Indicates the status that reflection of the difference between the MV and RV at the copy start instruction has been completed. Updates to the MV are reflected on the RV sequentially for the pair in this state.

Indicates the status that difference between MV and RV is not reflected at the time of restore execution.

Indicates the status that difference between MV and RV is reflected at the time of restore execution. Updated MV content is reflected to RV.

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Chapter 3 Replication Management

(x) Copy Control State

The control status in copying is displayed.

For more information, refer to 2.4 “Copy Control State”.

Display Description

Foreground Copy Indicates the copy state in the synchronous or semi-synchronous mode.

Background Copy Indicates the asynchronous copy state by difference management.

Freeze Indicates that the data replication function is frozen.

Suspend Indicates that copy operation is suspended.

Abnormal Suspend Indicates that copy is forcibly suspended in the disk array due to a copy fault.

(xi) Copy Mode

The copy control state in the synchronous state during Replicate/Restore is displayed.

Display Description

Synchronous

Semi-synchronous

Background Copy

(xii) RV Mode

RV access restrictions are displayed. For more information, refer to 2.6 “RV Access

Restriction”.

Display Description

R/W Permit Indicates that the volume can be read and written from the host.

Read Only Indicates that the volume can be only read from the host.

Not Ready Indicates that the volume cannot be operated from the host.

Not Available Indicates that the volume cannot be operated from any host.

(xiii) Differential Quantity of Volume

Indicates the amount of difference after Separate (including the state right after pair setting) and

the amount of difference (the remaining amount) during synchronous execution.

Amount of difference may not change if I/O load is too heavy.

If a link failure occurs, amount of difference may not change. In this case, refer to 2.2.2 (2)

“Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for

Windows)”.

This mode completes copying to RV within the processing time of the command for writing to MV.

This mode stops the command for writing to MV and immediately performs copying to RV.

This mode performs copying to RV asynchronously after stopping the command for writing to MV.

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Chapter 3 Replication Management

(xiv) Number of Pairs

Indicates the number of related pairs. This value is equal to “the number of volumes which make

up the pair link” minus 1.

An example of pair relations and Number of Pairs is shown below.

Number of Pairs Pair Relation

Some replication operations cannot be carried out while in the Replicate state, Restore state, or

Separate execution if the pair relation has multiple layers or if multiple RVs are connected to one

MV (Refer to the execution conditions of the operations). If the Number of Pairs is 2 or greater,

check the hierarchy in the Connection screen.

(xv) Capacity [GB]

Indicates the capacity of the logical disk.

(xvi) L D Se t Na me

Indicates the name of the LD Set to which the volume belongs.

(xvii) ATgroup Name

Indicates the name of the AT-group to which the volume belongs.

* For details on the AT-group, refer to the “Data Replication User’s Manual (Disaster Recovery

System Installation and Operation Guide)”.

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When you click the [Disk Array LINK Information] tab in the information list display area, the link

information currently set between the disk arrays is displayed (refer to Figure 3-4 “Example of Disk

Array LINK Information Screen”).

To perform sort, click the item name by which you want to sort. You can drag&drop an item to

permute the order of the items.

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Figure 3-4 Example of Disk Array LINK Information Screen

The Disk Array LINK Information screen displays information regarding the following items.

(i) LINK Number

Indicates the number of the linked disk arrays. The link number "0" is allocated to the first disk

array, and "1" to the second disk array (refer to Figure 3-5 “Replication Link Information”). The

icon shows the following path status.

Icon Description

(Green)

(Gray)

(Light Blue)

(Red)

Indicates the status of normal or link checking.

Indicates the offline status.

Indicates the status that the data replication function is frozen.

Indicates that a fault occurs.

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Chapter 3 Replication Management

(ii) LINK Disk Array Name

Indicates the identification name assigned to the linked disk array.

(iii) Path Number

Indicates the connection path number in the link.

If the link is connected via four paths, the path numbers are 0, 1, 2, and 3, respectively (refer to

Figure 3-5 “Replication Link Information”).

(iv) Path State

Display Description

Normal Indicates the normal status.

Offline Indicates that the link setting is unconfirmed during startup of the disk array.

Freeze Indicates that the Data Replication function in the target disk array is frozen.

Link Checking

Fault Indicates that the link is invalid due to a failure of communication in the link.

(v) Director Number

Indicates the replication director number (host director for the S2400 and 2800 series) that the link

is set.

Indicates that the link status is being checked due to a failure of communication in the link. It transits to Normal or Fault after a certain time interval.

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Figure 3-5 shows an example of two disk arrays connected to Disk Array 1 for using RDR. The

following shows an example of 3000/4000 series.

Director Number

Disk Array 1

Replication Director

Port Numbe

#05h

#0dh

#11h

Path Numbe

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#1

#0

#1

Path #00h

Path #01h

Path #02h

Path #03h

Path #00h

Path #01h

#00h

#01h

Figure 3-5 Replication Link Information

Disk Array 2

Disk Array 3

LINK Number

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The list of menu bar items of Replication Management is shown below. For details, refer to

description on each menu item.

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3.3.13 “CSV Output of Information List Display”

3.3.14 “Save Pair Setting Information”

Closes the Replication screen.

Shows or hides the status bar.

Shows or hides IVs.

3.4.8 “Display Copy Fault List”

3.4.5 “Record Screen Information”

3.4.3 “Environment Setting”

3.3.12 “Displaying Volume Connection State”

(when “Connection Screen” is displayed)

3.4.6 “Display Disk Array Properties” (when

Disk Array is selected from configuration

display area and “Properties” is displayed)

3.4.7 “Display Link Properties” (when

Director Port is selected from Disk Array

LINK Information Screen and “Properties” is

displayed)

3.4.4 “Refresh”

3.3.1 “Pair Setting/Unpair”

3.3.2 “Replicate”

3.3.3 “Separate”

3.3.4 “Restore”

3.3.5 “Suspend/Resume Copy”

3.3.6 “Change to Background Copy”

3.3.7 “RV Mode Change”

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3.3.8 “Forced Separate”

3.3.9 “Forced Unpair”

3.3.10 “Freeze/Defreeze”

3.3.11 “Background Copy Level Change”

For details on operations related to the

AT-group, refer to the “Data Replication

User’s Manual (Disaster Recovery

System Installation and Operation

Guide)”.

Displays Help on the Replication screen.

Displays Help on the dialog list

regarding Replication screen.

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The Execution dialog displayed for replication operations can be switched to [Summary] or [Details]

display mode for the volume-related information displayed.

In the description given below, the unpair execution dialog is used as an example. You can read

“operation” in the description as “Replicate”, “Restore”, etc. to be carried out.

Figure 3-6 shows an example of an Execution dialog information screen.

Items added when [Details] is selected

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Information on the following items is displayed on the information screen of the execution dialog.

* Items (v), (vi), and (vii) are displayed only when [Details] is selected.

(i) Execution Result

Displays the execution result of the operation. Operation cannot be performed for a pair with

“Unexecutable”.

After the operation is executed, the execution results for the operation are displayed. To check

on the progress after the operation, close the execution dialog and check the progress on the

Connection Screen.

(ii) Unexecutable Information

Displays the reason why operation cannot be performed.

(iii) Activity State

Displays the execution state of the pair.

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(iv) Logical Disk Name

Displays the logical disk name of MV.

(v) Copy Control State

Displays the control state during copy.

(vi) Sync State

Displays the transition status in the activity state.

(vii) Copy Mode

Displays the Synchronous/Semi-synchronous mode during copy operation.

(viii) Number

Displays the logical disk number of MV.

(ix) MV Disk Array Name

Displays the disk array name to which MV belongs.

(x) Pair Disk Name

Displays the logical disk name of RV.

(xi) Pair Number

Displays the logical disk number of RV.

(xii) RV Disk Array Name

Displays the disk array name to which RV belongs.

(xiii) ATgroup Name

Displays the name of the AT-group to which the volume belongs.

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To perform replication operations, you must set pairs beforehand.

To set a pair, set the original volume as MV and the target volume as RV. You can also use the

volume you have set as RV in another pair by setting it as MV.

You can set pairs freely within the following bounds.

• You can set up to three volumes of RVs (dRVs) or up to four volumes of RVs (including rRV) for

one MV at the same time.

• You can set RVs in up to 2 disk arrays for one PV.

• You can set DynamicDataReplication only for one layer in the disk array.

• You can set a pair only when the two volumes have the same capacity.

Figure 3-7 shows an example of the pair setting.

You may want to specify multiple pairs simultaneously, for example, when you initially build or rebuild

a replication environment. To specify pair environments at a time, use “Replication Setting” of “New

Setting” which is one of the configuration setting functions. For details, refer to the “Configuration

Setting Tool User’s Manual (GUI)” and 3.4.2 “Save Pair Setting Information”.

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[Operation Procedure]

Pair Setting

Do one of the following to display the Pair Setting screen.

y Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, and then select [Pair Setting].

y Right-click in the Replication Information screen, and then select [Pair Setting].

In pair setting, whether the selected volume can be set as MV is determined automatically. If the

selected volume is a volume for which pair setting cannot be performed as MV, the following prompt

appears.

Figure 3-8 Confirmation Screen

The possible causes are as follows:

Unexecutable condition Description

DDR/RDR

DDR

RDR

After checking the message, click the [Yes] button to display the Pair Setting screen. To select a

volume again on the Replication Information screen, click the [No] button.

Due to the description of the reason, the volume cannot be set as MV of DDR and RDR.

Due to the description of the reason, the volume cannot be set as MV of DDR.

Due to the description of the reason, the volume cannot be set as MV of RDR.

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Figure 3-9 shows an example of the Pair Setting Screen.

(i)

(ii)

(iii)

(iv)

(v)

Chapter 3 Replication Management

Figure 3-9 Example of Pair Setting Screen

After the Pair Setting, the copy operation such as Replicate, Restore etc. is available.

(i) Data Replication Mode

Select the method of setting pairs.

Radio Button Description

Dynamic Data Replication (within a Disk Array)

Remote Data Replication (between Disk Arrays)

(ii) Disk Array Name

On the MV part, displays the disk array name with the selected volume.

On the RV part, displays the disk array name for which pair setting of remote data replication

can be performed.

(iii) Object

To make only the selected volume the object of MV, check this (default).

To make all the volumes that can be used as MV the objects, uncheck this.

(iv) LD Set Name

You can narrow down object volumes for which pair setting can be performed by the LD Set

Name.

When the object volume for which pair setting can be performed is not registered in the LD

Set, LD Set Name cannot be used for narrowing down nor selected.

MV and RV use the volumes in the same Disk Array.

MV and RV use the volumes in different Disk Arrays.

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ALL : All volumes become selectable objects.

LD Set Name : Volumes registered in the selected LD Set become selectable objects.

Undefined : Volumes not registered in the LD Set become selectable objects.

(v) Logical Disk

Select the Logical Disk which you want to set.

When you click the [Execute] button, the following message is displayed.

(i)

(ii)

Figure 3-10 Confirmation Screen

Unpair

Do one of the following to display the Unpair screen.

y Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, and then select [Unpair].

y Right-click in the Replication Information screen, and then select [Unpair].

Figure 3-11 shows an example of the Unpair screen.

Selecte

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Figure 3-11 Example of Unpair Screen

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Chapter 3 Replication Management

From the list, select a pair you want to unpair, and then click the [Execute] button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Replicated Change it to the Separated state and execute it again.

Restored Change it to the Separated state and execute it again.

Separating Execute it again in the Separated state.

Freeze Defreeze the Data Replication function and execute it again.

MV Force Unpaired Perform Forced Unpair for RV.

MV Monitoring Suspended

RV Monitoring Suspended

RV Force Unpaired Perform Forced Unpair for MV.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

When you click the [Execute] button, the following message is displayed.

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group. Or, execute it after deleting a volume from the AT-group.

Figure 3-12 Confirmation Screen

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Chapter 3 Replication Management

[Execution Conditions]

To Pair setting or Unpair, the following conditions must be satisfied.

Conditions for Pair setting

Volumes in which the pair setting is performed must satisfy the following conditions.

(i) The volume capacities of MV and RV match.

(ii) The specified RV is not set as RV for another pair.

(iii) If the specified MV is set as MV for another pair, the maximum number of simultaneous pairs is

not exceeded.

(iv) The volume formats match.

(v) The pair hierarchy does not form any loop.

(vi) When MV and RV exist in the same disk array and if RV is used to set another pair, a volume in

another disk array is specified.

(vii) The disk array where the specified MV and RV are stored is monitored.

(viii) The disk array where the specified MV and RV are stored is not in the Freeze state.

(ix) If the specified MV is registered in the AT-group, the MV and the specified RV are set as a DDR

pair.

(x) A volume having snapshot attributes other than BV is not set as MV.

(xi) A volume having snapshot attributes is not set as RV.

Do not execute Pair Setting for a reserved volume of the business server or for a volume specified as

a performance optimization work disk. The replication screen does not display the Volume List.

Conditions for Unpair

Volumes for unpair must satisfy the following conditions.

(i) The specified MV and RV are paired.

(ii) The specified MV and RV are in the Separated state.

(iii) The disk array where the specified MV and RV are stored is monitored.

(iv) The disk array where the specified MV and RV are stored is not in the Freeze state.

(v) The specified MV is not registered in the AT-group.

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RV unmounted by the ReplicationControl function from a business server or backup server of

Windows may be set in the Not Ready state. In this case, even if the synchronous state of the pair

is “separated”, the RV mode is kept in the Not Ready state.

Make sure to change the RV set in the Not Ready state to the R/W Permit state by “RV mode

change” operation prior to unpair with the exception of the case where the logical disk of RV is used

by a business server or backup server in succession after unpair.

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When you perform Replicate for volumes with the pair setting, copy from MV to RV starts.

[Operation Procedure]

Do one of the following to display the Replicate screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Replicate].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Replicate].

Figure 3-13 shows an example of the Replicate screen.

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Figure 3-13 Example of Replicate Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

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Chapter 3 Replication Management

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Replicated Execute it for a volume in the Separate state.

Restored Execute it for a volume in the Separate state.

Being replicated by other pair

Being restored by other pair

Freeze Defreeze the Data Replication function and execute it again.

Being separated by other pair

MV Monitoring Suspended

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

Snapshotting Execute it for a pair that is not operating snapshot.

Replicate is being executed in another layer. Execute it again after Separate is complete.

Restore is being executed in another layer. Execute it again after Separate is complete.

Separate is being executed in another layer. Execute it again after Separate is complete.

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

(iii) Range

Normally, Only Difference is selected, which copies only the difference area of MV and RV.

You can also select All, which copies the entire area explicitly.

Radio Button Description

Only Difference Copies only the difference of the volumes.

All Copies the entire volume.

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(iv) Copy Mode

You can specify the copy control state in Replicate Execution and the Synchronous state at the

same time as Replicate. The following copy modes can be specified.

Radio Button Description

Synchronous

Semi-synchronous

Background Copy

(v) RV Status

Specifies the access restrictions from the host until Replicate is complete.

Radio Button Description

Not Ready Operations for the volume cannot be performed from the host.

Read Only For the volume, only read can be performed from the host.

* Care should be taken to specify Read Only. Refer to 2.6 “RV Access Restriction”.

When you click the [Execute] button, the following message is displayed.

Changes the copy control state to the foreground copy (Synchronous) mode.

Changes the copy control state to the foreground copy (Semi-synchronous) mode. This can be specified for pairs in different disk arrays.

Changes the copy control state to the Background Copy state.

Figure 3-14 Confirmation Screen

[Execution Conditions]

To perform Replicate, the following conditions must be satisfied.

(i) The target MV is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) The activity state of the target pair is Separate.

(iv) The Semi-synchronous Copy mode cannot be specified for pairs set in the same disk array.

The Semi-synchronous Copy mode can be specified only for pairs set in different disk arrays.

(v) The pair of the specified MV and the paired RV pair are not in the Restore state.

52

(vi) The activity state of the pair of the specified MV and the paired upper MV is not in the Restore

state.

(vii) The activity state of the pair of the specified RV and the paired lower RV is not in the Restore

state.

(viii) The disk array where the specified MV and RV are stored is not Freeze state.

(ix) The disk array where the specified MV and RV are stored is monitored.

(x) The RV has been unmounted from the host.

(xi) The specified MV is not registered in the AT-group.

(xii) Separate is not being performed between the upper volume and the lower volume that are paired.

(xiii) Snapshot is not in operation.

Figure 3-15 illustrates the execution conditions of Replicate. (Each of (i) to (xiii) in the figure

corresponds to the respective number above.)

(vi) Not in the Restore state (xii) Separate is not being

performed between the upper volume and the lower volume that are paired.

(v) Not in the Restore state

(xiii) Snapshot is not in operation.

MV

Chapter 3 Replication Management

Target Pair

RV

MV

Target Pair

MV

Target Pair

MV

BV

Figure 3-15 Execution Conditions of Replicate

RV

SV

RV

MV

RV

(vii) Not in the Restore state (xii) Separate is not being

(i) Replication Target Disk (ii) Pair Setting (iii) Separated (iv) Semi-synchronous not

allowed for the same disk

array (viii) Not in the Freeze state (ix) Disk array monitored (x) RV is unmounted from the

host. (xi) The specified MV is not

registered in the AT-group.

performed between the upper volume and the lower volume that are paired.

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If Separate is performed for paired volumes, MV is separated from RV and RV is made available. RV

cannot be reused until Separate is completed. However, it can be used for Separate(immediate).

[Operation Procedure]

Do one of the following to display the Separate screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Separate].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Separate].

Figure 3-16 shows an example of the Separate screen.

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Figure 3-16 Example of Separate Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

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Chapter 3 Replication Management

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with a volume of the Synchronous state.

Separated Execute it for a volume in the Synchronous state.

Restoring Execute it again when Restored is completed.

Suspend State Execute it again in the Synchronous state after copy is resumed.

Abnormal Suspend

Freeze Defreeze the Data Replication function and execute it again.

MV Monitoring Suspended

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

RV Forced Separate Execute it for a volume in the Synchronous state.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

Refer to 2.2.2 “HW Fault Unique to Replication” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

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(iii) RV Use Start Time

Determine when to make the RV available.

Radio Button Description

Separate End

Separate Start

* DynamicDataReplication Ver2 needs to be installed for using this function. The function is

available only for paired volumes in the same disk array.

(iv) Separated RV Status

Specifies the operation in response to a write request from the host after Separate is complete.

Radio Button Description

R/W Permit

Read Only Only read can be performed for a separated RV is complete from the host.

When you click the [Execute] button, the following message is displayed.

After Separate execution, the RV becomes available when the difference between the MV and RV contents has been reflected into the RV (Separate(completion)).

After Separate execution, the RV is immediately available while the difference between the MV and RV contents is being reflected into the RV (Separate(immediate)).

Read and write can be performed for a separated RV is complete from the host.

Figure 3-17 Confirmation Screen

[Execution Conditions]

To perform Separate, the following conditions must be satisfied. RV cannot be reused until Separate

is completed. However, it can be used for Separate(completion).

(i) The target MV is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) The target pair is not in the Restore Execution state.

(iv) The disk array where the specified MV and RV are stored is not in the Freeze state.

(v) The disk array where the specified MV and RV are stored is monitored.

(vi) The MV is unmounted from the host.

(vii) The specified MV is not registered in the AT-group.

(viii) Separate is not being performed between the upper volume and the lower volume that are paired.

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Chapter 3 Replication Management

Figure 3-18 illustrates the execution conditions of Separate. (Each of (i) to (viii) in the figure

corresponds to the respective number above.)

(i) Replication Target Disk (ii) Pair Setting (iii) Not in Restore execution (iv) Not in the Freeze state (v) Disk array monitored (vi) MV is unmounted from the host. (vii) The specified MV is not registered in the

Target Pair

MV

RV

Figure 3-18 Execution Conditions of Separate

AT-group.

(viii) Separate is not being performed

between the upper volume and the lower volume that are paired.

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When you perform Restore for volumes with the pair setting, copy from RV to MV starts.

[Operation Procedure]

Do one of the following to display the Restore screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Restore].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Restore].

Figure 3-19 shows an example of the Restore screen.

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(iv)

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Figure 3-19 Example of Restore Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

ot selected

Cannot be selected

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Chapter 3 Replication Management

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Replicated Execute it for a volume in the Separate state.

Restored Execute it for a volume in the Separate state.

Being replicated by other pair

Being restored by other pair

Separating Execute it again in the Separated state.

Freeze Defreeze the Data Replication function and execute it again.

Being separated by other pair

MV Monitoring Suspended

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

Replicate is being executed in another layer. Execute it again after Separate is complete.

Restore is being executed in another layer. Execute it again after Separate is complete.

Separate is being executed in another layer. Execute it again after Separate is complete.

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

Snapshotting Execute it for a pair not in snapshot operation.

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

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Chapter 3 Replication Management

(iii) Active Mode

Specify a Restore operation mode.

Radio Button Description

RV Protection

RV Update Performs restoration while reflecting the updated data of the MV into the RV.

The default operation mode in (iii) is “RV Protection”.

Confirm the Restore operation mode before executing Restore.

“RV Update” needs to be selected for executing Restore in the same operation mode as for

Version1.4 or earlier.

If “RV Protection” is selected, selection of (v) Copy mode is not permitted.

(iv) Range

Normally, Only Difference is selected, which copies only the difference area of MV and RV.

You can also select All, which copies the entire area explicitly.

Radio Button Description

Performs restoration without reflecting the updated data of the MV into the RV.

When the restoration is completed, Separate is automatically executed.

* To use this function for paired volumes located in the same disk array,

the DynamicDataReplication Ver2 is necessary, and to use this function for paired volumes located in different disk arrays, the RemoteDataReplication Ver2 is necessary.

When the restoration is completed, the state changes to Synchronous State (rst/sync).

Only Difference Copies only the difference of the volumes.

All Copies the entire volume.

(v) Copy Mode

You can specify the copy control state in Restore Execution and the Synchronous state at the same

time as Restore. The following copy modes can be specified.

Radio Button Description

Synchronous

Semi-synchronous

Background Copy Changes the copy control state to the Background Copy state.

Changes the copy control state to the foreground copy (Synchronous) mode.

Changes the copy control state to the foreground copy (Semi-synchronous) mode. This can be specified for pairs in different disk arrays.

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Chapter 3 Replication Management

(vi) RV Status

Specifies the access restrictions from the host until Restore is complete.

Radio Button Description

Not Ready Operations for the volume cannot be performed from the host.

Read Only For the volume, only read can be performed from the host.

* Care should be taken to specify Read Only. Refer to 2.6 “RV Access

Restriction”.

When you click the [Execute] button, the following message is displayed.

Figure 3-20 Confirmation Screen

[Execution Conditions]

To perform Restore, the following conditions must be satisfied.

(i) The target MV is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) The activity state of the target pair is Separate, but not Separate Execution.

(iv) The Semi-synchronous Copy mode cannot be specified for pairs set in the same disk array.

The Semi-synchronous Copy mode can be specified only for pairs set in different disk arrays.

(v) The activity state of the pair of the specified MV and the paired RV is Separate.

(vi) The activity state of the pair of the specified MV and the paired upper MV is Separate.

(vii) The activity state of the pair of the specified RV and the paired lower RV is Separate.

(viii) The disk array where the specified MV and RV are stored is not in the Freeze state.

(ix) The disk array where the specified MV and RV are stored is monitored.

(x) The MV and RV are unmounted from the host.

(xi) The specified MV is not registered in the AT-group.

(xii) Separate is not being performed between the upper volume, the lower volume, and the derived

volume that are paired.

(xiii) Snapshot is not in operation.

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Chapter 3 Replication Management

Figure 3-21 illustrates the execution conditions of Restore. (Each of (i) to (xiii) in the figure

corresponds to the respective number above.)

(vi) Separated (xii) Separate is not

being performed for an upper volume.

MV

Target Pair

RV

MV

RV

MV

RV

(i) Replication Target Disk (ii) Pair Setting (iii) Separated (iv) Semi-synchronous not

allowed for the same disk

array (viii) Not in the Freeze state (ix) Disk array monitored (x) MV and RV are

unmounted from the host. (xi) The specified MV is not

registered in the

AT-group.

(v) Separated (xii) Separate is not being

performed for a derived pair.

(xiii) Snapshot is not in operation.

(vii) Separated

Target Pair

MV

Target Pair

MV

BV

RV

(xii) Separate is not being

performed for a lower pair.

SV

Figure 3-21 Execution Conditions of Restore

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You can suspend and resume copy operation in the Replicate or Restore state.

[Operation Procedure]

Suspend Copy

The Foreground Copy or Background Copy state is changed to the Suspend Copy state.

Do one of the following to display the Suspend Copy screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Suspend Copy].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Suspend Copy].

Figure 3-22 shows an example of the Suspend Copy screen.

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Figure 3-22 Example of Suspend Copy Screen

From the list, select a pair for which you want to perform the operation, and then click the

[Execute] button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

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Chapter 3 Replication Management

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Already Suspended Execute it for a volume in the Replicate state, Restore state.

Separate State Execute it for a volume in the Replicate state or Restore state.

Freeze Defreeze the Data Replication function and execute it again.

MV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

RV Forced Separate Execute it for a volume in the Synchronous state.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

Resume Copy

The Suspend Copy or Background Copy state is changed to the Foreground Copy state.

Do one of the following to display the Resume Copy screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Resume Copy].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Resume Copy].

Change the disk array of MV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

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Figure 3-23 shows an example of the Resume Copy screen.

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Figure 3-23 Example of Resume Copy Screen

From the list, select a pair for which you want to perform the operation, and then click the

[Execute] button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

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Chapter 3 Replication Management

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Foreground Copy State Execute it for a volume in the Suspend state.

Separate State Execute it for a volume in the Suspend state.

Freeze Defreeze the Data Replication function and execute it again.

MV Monitoring Suspended

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

RV Forced Separate Execute it for a volume in the Synchronous state.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

(iii) Copy Mode

You can specify the copy control state when copy is resumed.

The following copy modes can be specified.

Radio Button Description

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

Synchronous

Semi-synchronous

Background Copy Changes the copy control state to the Background Copy state.

When you click the [Execute] button, the following message is displayed.

Changes the copy control state to the foreground copy (Synchronous) mode.

Changes the copy control state to the foreground copy (Semi-synchronous) mode. This can be specified for pairs in different disk arrays.

Figure 3-24 Confirmation Screen

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[Execution Conditions]

To perform operations of suspending/resuming copy, the following conditions must be satisfied.

(i) The target MV is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) The activity state of the target pair is Replicate or Restore.

(iv) The Semi-synchronous Copy mode cannot be specified for pairs set in the same disk array.

The Semi-synchronous Copy mode can be specified only for pairs set in different disk arrays. (Can

be set only when copy is resumed.)

(v) The disk array where the specified MV and RV are stored is not in the Freeze state.

(vi) The disk array where the specified MV and RV are stored is monitored.

(In case of copy suspend, MV must be monitored)

(vii) The specified MV is not registered in the AT-group.

Figure 3-25 illustrates the execution conditions of operations of suspending/resuming copy. (Each of

(i) to (vii) in the figure corresponds to the respective number above.)

Figure 3-25 Execution Conditions of Suspend Copy and Resume Copy State Operation

Target Pair

MV

RV

(i) Replication Target Disk (ii) Pair Setting (iii) Replicate or Restore (iv) Semi-synchronous not allowed

for the same disk array (v) Not in the Freeze state (vi) Disk array monitored (vii) The specified MV is not

registered in the AT-group.

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The copy control state is changed from the Replicate or Restore state to the Background Copy state.

[Operation Procedure]

Do one of the following to display the Change to Background Copy screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [Change to Background Copy].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select

[Change to Background Copy].

Figure 3-26 shows an example of the Change to Background Copy screen.

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Figure 3-26 Example of Change to Background Copy Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

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Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Separate State Execute it for a volume in the Replicate state or Restore state.

Already Background Copy State

Freeze Defreeze the Data Replication function and execute it again.

MV Monitoring Suspended

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

RV Forced Separate Execute it for a volume in the Synchronous state.

MV Outside iSM Management

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

When you click the [Execute] button, the following message is displayed.

Execute it for a volume in Foreground Copy.

Change the disk array of MV to the Monitored state and execute it again.

Change the disk array of RV to the Monitored state and execute it again.

Execute it for a pair under the iSM management.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

Figure 3-27 Confirmation Screen

[Execution Conditions]

To perform changes to Background Copy, the following conditions must be satisfied.

(i) The target MV and RV are recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) The activity state of the target pair is Replicate or Restore.

(iv) The disk array where the specified MV and RV are stored is not in the Freeze state.

(v) The disk array where the specified MV and RV are stored is monitored.

(vi) The specified MV is not registered in the AT-group.

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Figure 3-28 illustrates the execution conditions of changes to Background Copy. (Each of (i) to (vi) in

the figure corresponds to the respective number above.)

Target Pair

MV

Figure 3-28 Execution Conditions of Change to Background Copy

RV

(i) Replication Target Disk (ii) Pair Setting (iii) Replicate or Restore (iv) Not in the Freeze state (v) Disk array monitored (vi) The specified MV is not

registered in the AT-group.

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You can change the RV access restriction.

[Operation Procedure]

Do one of the following to display the RV Mode Change screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Volume Operation], and then select [RV Mode Change].

• Right-click in the Replication Information screen, point to [Volume Operation], and then select [RV

Mode Change].

Figure 3-29 shows is an example of the RV Mode Change screen.

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Figure 3-29 Example of RV Mode Change Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

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(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Freeze Defreeze the Data Replication function and execute it again.

RV Outside iSM Management

RV Monitoring Suspended

MV Force Unpaired Perform Forced Unpair for RV.

RV Force Unpaired Perform Forced Unpair for MV.

All Link Path Abnormal

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

(iii) RV Status

Specifies the operations for a write request from the host.

Radio Button Description

R/W Permit Read and write can be performed for a volume from the host.

* This cannot be executed in Replicate, Restore, or Separate execution (Refer

to Figure 3-28 “Execution Conditions of Change to Background Copy”).

Execute it for a pair under the iSM management.

Change the disk array of RV to the Monitored state and execute it again.

Refer to 2.2.2 (2) “Link fault” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

Execute it for a pair that is not registered in the AT-group.

Not Ready Operations for the volume cannot be performed from the host.

Read Only For a volume, only read from the host can be performed.

* Care should be taken to specify Read Only. Refer to 2.6 “RV Access

Restriction”.

Not Available For a volume, access from the host is disabled.

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When you click the [Execute] button, the following message is displayed.

Figure 3-30 Confirmation Screen

When it is performed for a volume in Replicate, Restore, or Separate execution, the following warning

message is displayed and the change of the RV mode of the volume is cancelled.

Figure 3-31 Warning Screen

[Execution Conditions]

To change the RV mode, the following conditions must be satisfied.

(i) The target RV is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired.

(iii) In the Separated state (when R/W Permit is specified).

(iv) The disk array where the specified MV and RV are stored is not in the Freeze state.

(v) The disk array where the specified RV is stored is monitored.

(vi) The specified RV is not registered in the AT-group.

Figure 3-32 illustrates the execution conditions of change of the RV mode. (Each of (i) to (vi) in the

figure corresponds to the respective number above.)

(i) Replication Target Disk (ii) Pair Setting (iii) Separate state (when R/W

Permit is specified)

Target Pair

MV

Figure 3-32 Execution Conditions of Change of RV Mode

RV

(iv) Not in the Freeze state (v) Disk array in RV monitored (vi) The specified RV is not

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When a failure occurs in the connection between disk arrays and the normal Separate cannot be

performed on MV and RV, you can use Forced Separate to instruct Separate to MV and RV

individually.

Forced Separate forcibly separates MV and RV and makes RV available.

[Operation Procedure]

Do one of the following to display the Forced Separate screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Forced Operation], and then select [Forced Separate].

• Right-click in the Replication Information screen, point to [Forced Operation], and then select

[Forced Separate].

Figure 3-33 shows an example of the Forced Separate screen.

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Figure 3-33 Example of Forced Separate Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

You can select multiple executable pairs and execute them in a batch.

Unexecutable pairs cannot be selected.

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(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Separated Execute it for a volume in the Synchronous state.

MV Separated Complete Execute it for a volume in the Synchronous state.

Forced Separation Execute it for a volume in the Synchronous state.

MV Forced Separate Execute it for a volume in the Synchronous state.

MV Fault

MV Outside iSM Management

MV Monitoring Suspended

MV Freeze

MV Force Unpaired Perform Forced Unpair for RV.

RV Separate Complete Execute it for a volume in the Synchronous state.

RV Forced Separate Execute it for a volume in the Synchronous state.

RV Outside iSM Management

RV Monitoring Suspended

RV Freeze

RV Force Unpaired Perform Forced Unpair for MV.

Have been registered to ATgroup

Refer to 2.2.2 “HW Fault Unique to Replication” in the “Data Replication User’s Manual (Installation and Operation Guide for Windows)” to recover from the failure.

After execution of RV Forced Separate, perform Forced Separate for the volume in MV with the pair setting.

After execution of MV Forced Separate, perform Forced Separate for the volume in RV with the pair setting.

Execute it for a volume that is not registered in the AT-group.

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

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Figure 3-34 is displayed when MV is not under the iSM. Figure 3-35 is displayed when RV is not

under the iSM.

After execution, perform Forced Separate for MV or RV not separated.

Figure 3-34 Warning Screen for MV without under iSM

Figure 3-35 Warning Screen for RV without under iSM

When you click the [Yes] button, the following message is displayed.

Figure 3-36 Confirmation Screen

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[Execution Conditions]

To perform Forced Separate, the following conditions must be satisfied.

(i) The target volume is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired, or one of them is forcibly separated.

(iii) The disk array where the specified MV and RV are stored is not in the Freeze state.

(iv) The disk array where the specified volume is stored is monitored.

(v) The specified MV or RV is not registered in the AT-group.

Figure 3-37 illustrates the execution conditions of Forced Separate. (Each of (i) to (v) in the figure

corresponds to the respective number above.)

Target Pair

MV

RV

Figure 3-37 Execution Conditions of Forced Separate

(i) Replication Target Disk (ii) Pair Setting (iii) Not in the Freeze state (iv) Disk array monitored (v) The specified MV or RV is not

registered in the AT-group

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When a failure occurs in the disk array of MV or RV, monitoring is suspended and the normal Cancel

Pair may not be performed. In such a case, you can use Forced Unpair to unpair the pairs for MV and

RV separately.

[Operation Procedure]

Before performing Forced Unpair, you must separate MV and RV with Separate or Forced Separate.

Do one of the following to display the Forced Unpair screen.

• Select a volume in the Replication Information screen, click [Operation] on the menu bar of the

Replication screen, point to [Forced Operation], and then select [Forced Unpair].

• Right-click in the Replication Information screen, point to [Forced Operation], and then select

[Forced Unpair].

Figure 3-38 shows an example of the Forced Unpair screen.

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Figure 3-38 Example of Forced Unpair Screen

From the list, select a pair for which you want to perform the operation, and then click the [Execute]

button.

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Unexecutable pairs cannot be selected.

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(i) Selected Volume List

Displays the list of the pair (MV/RV) information selected in the Replication Information screen.

Volumes whose Execution Result is “Unexecutable” cannot be selected because they do not

satisfy the execution conditions.

For the “Unexecutable” volumes, do the following by referring to the Unexecutable Information.

Unexecutable Information Measure

Have Unpaired Execute it for a volume with the pair setting.

Separating Execute it again in the Separated state.

MV Separating Execute it again in the Separated state.

Replicate Execute it for a volume in the Separate state.

MV Replicate Execute it for a volume in the Separate state.

Restore Execute it for a volume in the Separate state.

MV Restore Execute it for a volume in the Separate state.

MV Outside iSM Management

MV Monitoring Suspended

MV Freeze

MV Force Unpaired Perform Forced Unpair for RV.

RV Separating Execute it again in the Separated state.

RV Replicate Execute it for a volume in the Separate state.

RV Restore Execute it for a volume in the Separate state.

RV Outside iSM Management

RV Monitoring Suspended

RV Freeze

RV Force Unpaired Perform Forced Unpair for MV.

Have been registered to ATgroup

(ii) Summary Display/Details Display

For more information on this item, refer to 3.2.6 “Information Displayed on Execution Dialog”.

After execution of RV Forced Unpair, perform Forced unpair for the volume in MV with the pair setting.

After execution of MV Forced Unpair, perform Forced unpair for the volume in RV with the pair setting.

Execute it for a volume that is not registered in the AT-group.

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If Forced Unpair is performed for either MV or RV, the replication operations will not function

properly because inconsistency occurs in the recognized states of MV and RV. In this case,

perform Forced Unpair for MV or RV for which Unpair is not performed.

Figure 3-39 is displayed when MV is not under the iSM. Figure 3-40 is displayed when RV is not

under the iSM.

Figure 3-39 Warning Screen for MV without under iSM

Figure 3-40 Warning Screen for RV without under iSM

When you click the [Yes] button, the following message is displayed.

Figure 3-41 Confirmation Screen

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[Execution Conditions]

To perform Forced Unpair, the following conditions must be satisfied.

(i) The target volume is recognized by Replication Management as the Replication target disk.

(ii) The target MV and RV are paired, or one of them is forcibly unpaired.

(iii) The target pair is in the Separated or Forced Separate state.

(iv) The disk array where the specified MV and RV are stored is not in the Freeze state.

(v) The disk array where the specified volume is stored is monitored.

(vi) The specified MV or RV is not registered in the AT-group.

Figure 3-42 shows the execution conditions for Forced Unpair. (Each of (i) to (vi) in this figure

correspond to the respective number above.)

(i) Replication Target Disk (ii) Pair Setting, or one of them is

forcibly unpaired.

(iii) Separated or Forced Separate

state

Target Pair

MV

RV

(iv) Not in the Freeze state (v) Disk array monitored (vi) The specified MV or RV is not

registered in the AT-group

Figure 3-42 Execution Conditions of Forced Unpair

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You can freeze or defreeze the Data Replication function of the disk array.

[Operation Procedure]

Do one of the following to display the Freeze/Defreeze screen.

• Select the disk array in the configuration display area, click [Operation] on the menu bar of the

Replication screen, point to [System Operation], and then select [Freeze/Defreeze].

• Select the disk array in the configuration display area, right-click it, and then select [Freeze/Defreeze].

Figure 3-43 shows an example of the Freeze/Defreeze screen.

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(i) Freeze/Defreeze Execute

Button Description

Freeze Freezes (invalidates) the Data Replication function of the disk array.

Defreeze Defreezes (validates) the Data Replication function of the disk array.

When you click the [Execute] button, the following message is displayed.

Figure 3-44 Confirmation Screen

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[Execution Conditions]

To perform Freeze/Defreeze, the following conditions must be satisfied.

(i) The target disk array is recognized by Replication Management.

(ii) The specified disk array is monitored.

When you perform Freeze, no replication operations can be performed in the disk array. Refer to 2.8

“Freeze of Disk Arrays”.

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[Operation Procedure]

Do one of the following to display the Background Copy Level Change screen.

• Select the disk array in the configuration display area, click [Operation] on the menu bar of the

Replication screen, point to [System Operation], and then select [Background Copy Level Change].

• Select the disk array in the configuration display area, right-click it, and then select [Background

Copy Level Change].

Figure 3-45 shows an example of the Background Copy Level Change screen.

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(i) Background Copy Level

Specifies the priority of copy operation when Background Copy is selected in Replicate and

Restore.

A higher priority results in faster copying for reflecting difference. (For more information, refer

to 2.4 “Copy Control State”.)

• Return Default Value

Restores the default value of the disk array.

• Change

You can specify the priority of the disk array.

When you click the [Execute] button, the following message is displayed.

Figure 3-46 Confirmation Screen

[Execution Conditions]

To perform operations of the copy control state, the following conditions must be satisfied.

(i) The target disk array is recognized by Replication Management.

(ii) The specified disk array is monitored.

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The connection state of the volume is displayed.

[Operation Procedure]

Do one of the following to display the Volume Connection screen.

y Select a volume in the Replication Information screen, point to [View] on the menu bar of the

Replication screen, and then select [Connection Screen].

y Select a volume in the Replication Information screen, right-click it, and then select [Connection

Screen].

y Double-click a volume in the Replication Information screen.

Figure 3-47 shows an example of the Connection screen.

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This screen displays the pair selected in the Replication Information screen. If two or more volumes

are selected, all of them are displayed.

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(i) Disk Array Name

Displays the name of the disk array where the volume exists.

The disk array name of the selected volume is highlighted.

(ii) Logical Disk Number, Format, Logical Disk Name

Displays them in the form of “(logical disk number) format:logical disk name (or VAA)”.

The logical disk number, format, and logical disk name of the selected volume is highlighted.

(iii) Copy Progress

Displays the progress of copy. This display disappears when copy is complete.

Progress may not change if I/O load is too heavy.

If a link failure occurs, Progress may not change. In this case, refer to 2.2.2 (2) “Link fault” in

the “Data Replication User’s Manual (Installation and Operation Guide for Windows)”.

(iv) Access Restrictions for RV

Displays the access restrictions for RV. There are the following modes.

Mode Description

R/W Permit Read and write can be performed for a volume from the host.

Read Only Only read can be performed for a volume from the host.

Not Ready Operations for a volume cannot be operated from the host.

Not Available Operations for a volume cannot be operated from any host.

(v) Operation Time Display

Displays the Start Time and End Time when operation for a volume is performed.

Displays the transition time at the forced separation or fault occurrence.

Displays the estimate of remaining time before copy completion during Replicate, Restore, or

Separate. However, “-“ is displayed for the time if the disk array to which MV belongs is not

recognized by replication management.

* The time is displayed at the forced separation only on the RV side even if replication

management does not recognize the disk array to which MV belongs.

Note: The estimate of remaining time may not be correct because it changes according to the

monitoring timing, the units, the status of lines and so on.

(vi) Differential Quantity of Volume

Displays “remaining amount/transfer rate” during synchronization.

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[Connection Display of Paired Volumes]

Connections of volumes are displayed as pipes as shown below.

During copy operation, the color of the original disk moves through the pipe.

y For DynamicDataReplication

Replicate is executed : Replicate is complete :

Restore is executed : Restore is complete :

Separate is executed : Separate is complete :

y For RemoteDataReplication

Replicate is executed : Replicate is complete :

Restore is executed : Restore is complete :

Separate is executed : Separate is complete :

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[Differential Quantity of Volume/Transfer Rate]

Displays the amount of difference and transfer rate during copy operation.

The unit of the amount of difference is variable (e.g. KB, MB, GB), and the unit of transfer rate is fixed

(MB/S).

Example of Display (Replicate)

Amount of Difference Transfer Rate

When Replication is complete (Amount of Difference=0), Amount of Difference and Transfer Rate

(MB/S) disappears.

After Replicate is complete

[Volume Color]

The Volume Color changes by layer and it becomes the layer color immediately after setting the pair or

when Separate has completed.

When volume colors of the pair match, it indicates synchronization.

Layer color

(i) PV: Yellowish green

(ii) 1st Layer: Light blue

(iii) 2nd Layer: Blue

(iv) 3rd Layer: Yellow

Example of Display

Yellowish green Light blue Blue Yellow

PV 1st Layer 2nd Layer 3rd Layer

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In the pair connected by RemoteDataReplication, the remote disk array is not managed by iSM or, in

a monitoring stop, may be displayed like the above.

In the pair connected by RemoteDataReplication, when Remote Volume cannot be recognized from

the host computer which Local Volume has connected by having performed Forced Unpair to

Remote Volume etc., it may display like the above.

Case of the 2nd layer or more layer pair composition, when Forced Unpair is performed to the

volume of the 1st layer or the 2nd layer, the volume of upper layers may not be displayed.

[Copy Progress]

Displays the progress of Replicate, Restore, etc. as the change in volume.

Example of Display 1: Replicate

Replicate Execution

Replicate is complete

Turns to the same color when synchronized.

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b

Example of Display 2: Separate during Replicate

Replicate Execution

Separate Execution

Separate is executed.

Separate is complete.

Turns to the layer color

ecause Separate is complete.

[Others]

You can perform the replication operations by right-clicking the volume in the Connection screen. For

how to operate, refer to the items in 3.3.

3.3.2 “Replicate”

3.3.3 “Separate”

3.3.4 “Restore”

3.3.5 “Suspend/Resume Copy”

3.3.6 “Change to Background Copy”

3.3.7 “RV Mode Change”

3.3.8 “Forced Separate”

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The replication information, the disk array LINK Information, and the AT-group information for the

specified disk array can be output to a file in CSV format.

This CSV file can be used as a data for spreadsheet software.

On the menu bar, do the following:

• Click [File], and then click [CSV Output of Information List Display].

Figure 3-48 shows an example of the CSV Output of Information List Display screen.

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Figure 3-48 Example of CSV Output of Information List Display Screen

91

Chapter 3 Replication Management

[CSV File Containing Information Display List]

This section shows an example of the CSV file that is created by executing the CSV output of

information display list.

In this file, the information displayed on the screen is written in the format in which each item is

separated by commas.

An example of the CSV file

Classification, Number, OS Type, Logical Disk Name, Pair Number, Paired Disk Name, Activity

State, Disk Array, Sync State, Copy Control State, Copy Mode, RV Mode, Differential Quantity of

Volume, Number of Pairs, Capacity [GB], LD Set name, ATgroup name

IV,0000h,WN,driveWN0,,,,,,,,,,,4.2,,

MV,0001h,WN,driveWN1,0001h,driveWN2,Replicate,Storage4300,Synchronized,Foreground

Copy,,,0 KB,1,4.2,WN:wos1,ATG0

RV,0002h,WN,driveWN2,0000h,driveWN1,Replicate,Storage4300,Synchronized,Foreground

Copy,Not Ready,,0 KB,1,4.2,,

MV,0003h,WN,driveWN3,0004h,driveWN4,Replicate,Storage4300,Synchronized,Foreground

Copy,,,3.7GB,1,4.2,,

RV,0004h,WN,driveWN4,0003h,driveWN3,Replicate,Storage4300,Synchronized,Foreground

Copy,Not Ready,,3.7 GB,1,4.2,,

IV,0005h,WN,driveWN5,,,,,,,,,,,4.2,WN:wos1,ATG1

IV,0006h,WN,driveWN6,,,,,,,,,,,4.2,WN:wos1,ATG2

MV,0007h,WN,driveWN7,0008h,driveWN8,Restore,Storage4300,Synchronized,Foreground

Copy,,,0 KB,1,4.2,,

RV,0008h,WN,driveWN8,0007h,driveWN7,Restore,Storage4300,Synchronized,Foreground

Copy,Not Ready,,0 KB,1,4.2,,

MV,0009h,WN,driveWN9,000ah,driveWNa,Separate,Storage4300,Forced Separation,,,,0

KB,1,4.2,,

RV,000ah,WN,driveWNa,0009h,driveWN9,Separate,Storage4300,Forced Separation,,R/W

Permit,,0 KB,1,4.2,,

IV,000bh,WN,driveWNb,,,,,,,,,,,4.2,,

MV,000ch,WN,driveWNc,000dh,driveWNd,Separate,Storage4300,Separated,,,,0

KB,1,4.2,WN:wos1,ATG3

RV,000dh,WN,driveWNd,000ch,driveWNc,Separate,Storage4300,Separated,,R/W Permit,,0

KB,1,4.2,,

92

NEC IS015-9E User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Contents

Chapter 1 Data Replication Overview

Backup

Chapter 2 Data Replication

Copy Control State Copy State

Chapter 3 Replication Management