Hitachi MP-96RD625-01 User Manual

Hit achi Universal Storage Platform V

Hitachi Universal Replicator for IBM® z/OS®

User's Guide

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Document Organization Product Version Getting Help Contents

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MP-96RD625-01

Hitachi Universal Replicator for IBM /OS User’s Guide

or transmitted in any form or by a ny means, electronic or mechanical, including photocopying and recording, o stored in a database or retrieval system for any purpose without the express written permission of Hitachi Data Systems Corporation (hereinafter referred to as “Hitachi Data Systems”).

Hitachi Data Systems reserves the right to make changes to this document at any time without notice and assumes no responsibility for its use. Hitachi Data Systems products and services can only be ordered under the terms and conditions of Hitachi Data Systems’ applicable agreements. All of the features described in this document may not be currently available. Refer to the most recent p roduct announcement or contact your local H itachi Data Systems sales office for information on feature and product availability.

This document contains the most curren t information available at the time of publication. When new and/or revised inform ation bec omes ava ilable, th is entire document will be updated and distributed to all registered users.

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All other brand or product names are or ma y be trademarks or service marks of and are used to identify products or services of their respective owners.

Contents

Overview of Universal Replicator for IBM z/OS®...................................... 1-1

Hitachi Universal Replicator................................................................................1-2

Features...........................................................................................................1-3

Benefits ............................................................................................................1-4

Business Solutions.............................................................................................1-5

About Universal Replicator Operations.................................................... 2-1

Functionality Overview.......................................................................................2-2

Journal Obtain............................................................................................2-3

Journal Copy..............................................................................................2-4

Journal Restore..........................................................................................2-4

Components.....................................................................................................2-4

USP V Storage Systems...............................................................................2-7

Universal Replicator for z/OS® Software........................................................2-7

Main and Remote Control Units....................................................................2-7

Logical DKC (LDKC) ....................................................................................2-8

Remote Copy Connections...........................................................................2-9

Initiator Ports and RCU Target Ports...........................................................2-10

Data Volume Pair......................................................................................2-10

Journal Volume ........................................................................................2-11

The Number of Journal Volumes..........................................................2-11

Specifications of Journal Volumes........................................................2-11

Restrictions on Journal Volumes.......................................................... 2-12

Journal Volume Areas.........................................................................2-13

Journal Group .......................................................................................... 2-13

Extended Consistency Groups....................................................................2-14

Host I/O Time-Stamp.........................................................................2-17

Error Reporting Communications (ERC)................................................2-18

Remote Copy Operations.................................................................................2-18

Initial Copy Operations..............................................................................2-19

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Hitachi Universal Replicator for IBM /OS User’s Guide

Update Copy Operation............................................................................ 2-20

Journal Group Operations......................................................................... 2-20

Timer Type Option ............................................................................ 2-21

Journal Group Operations .................................................................. 2-21

Read and Write I/O Operations During URz Operations............................... 2-22

Secondary Data Volume Write Option........................................................ 2-23

Secondary Data Volume Read Option ........................................................ 2-23

Difference Management ........................................................................... 2-23

Journal Processing.......................................................................................... 2-24

Journal Processing at the Primary Storage System...................................... 2-24

Types of Journal................................................................................ 2-25

Journal Processing at the Secondary Storage System.................................. 2-25

Storing Journal at the Secondary Storage System ................................ 2-25

Selecting and Restoring Journal at the Secondary Storage System......... 2-26

URz Delta Resync Operation............................................................................ 2-28

Journal Obtain in TCz Synchronous Secondary Site..................................... 2-28

Switching the Master Journal Group of URz................................................ 2-30

Pair Status..................................................................................................... 2-33

Suspend Types........................................................................................ 2-36

Suspension Condition............................................................................... 2-38

Business Continuity Manager Support............................................................... 2-39

Command Device..................................................................................... 2-42

Preparing for Universal Replicator z/OS Operations................................. 3-1

Requirements and Restrictions for URz............................................................... 3-2

System Requirements................................................................................. 3-2

Disk Track Format...................................................................................... 3-4

One-to-One Volume Copy Operations.......................................................... 3-4

Duplicate VOLSER (Volume Serial Number).................................................. 3-5

Volume Types............................................................................................ 3-5

The Maximum Number of Pairs............................................................. 3-8

Journal Group.......................................................................................... 3-11

Accessing URz Primary Data Volume and Secondary Data Volume................ 3-12

Cache and Nonvolatile Storage (NVS)........................................................ 3-12

Duplicate Volumes ................................................................................... 3-12

Installing the Hardware................................................................................... 3-13

Setting up Remote Copy Connections ........................................................ 3-14

Enabling the URz Option(s)............................................................................. 3-16

Using Multiple Primary and Secondary Storage Systems..................................... 3-16

Basic Behavior When Using Multiple Primary and Secondary Storage Systems3-18 Hardware Configuration for Multiple Primary and Secondary Storage Systems3-20

Connections Between Secondary Storage Systems...................................... 3-21

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Hitachi Universal Replicator for IBM /OS User’s Guide

Configuring Paths and Ports to Establish Connections among Secondary

Storage Systems .........................................................................3-22

Creating Remote Command Devices to Establish Connections among

Secondary Storage Systems .........................................................3-22

Interoperability with Other Products and Functions............................................3-23

Virtual LVI................................................................................................3-25

Cache Residency Manager.........................................................................3-25

ShadowImage for z/OS®........................................................................... 3-25

Using At-Time Split Function When Combining URz with

ShadowImage for z/OS® (SIz).............................................................3-32

TCz Synchronous (3DC Cascading Configuration)........................................3-34

Basic Behavior...................................................................................3-35

Hardware Configuration......................................................................3-37

Setup Procedure ................................................................................3-37

Transferring Business Tasks Back to the Primary Site............................3-38

TCz Synchronous (3DC Multi-target Configuration)......................................3-39

Hardware Configuration......................................................................3-41

Setup Procedure ................................................................................3-42

Requirements for Creating URz Pair for Delta Resync Operation.............3-43

Requirements for Performing Delta Resync Operation ...........................3-43

Changing to 3DC Multi-target Configuration after Recovering from

Primary Site Failures....................................................................3-45

Transferring Business Tasks from TCz Secondary Site to the Primary

Site (in 3DC Cascading Configuration)...........................................3-46

Transferring Business Tasks from TCz Secondary Site to the Primary

Site (in 3DC Multi-target Configuration)........................................3-47

Transferring Business Tasks from TCz Secondary Site to the Primary

Site (When Delta Resync Operation is Performed in 3DC

multi-target configuration) ...........................................................3-48

Recovering from Failures in the Primary Site and the TCz Synchronous

Secondary Site............................................................................

3-51

Transferring Business Tasks from the URz Secondary Site to the

Primary Site................................................................................

3-52

Planning of Journal Volumes ............................................................................3-55

Computing Required Data Transfer Speeds for Journal Volumes...................3-55

Planning RAID Group Configuration and Journal Group Configuration............3-56

Arranging Journal Volumes........................................................................3-57

Computing the Journal Volume Capacity.....................................................3-57

Planning Data Transfer Speed before Reversing Data Volumes.....................3-59

Contributing Factors for Data Transfer Speed between Storage Systems..............3-59

Bandwidth for Data Transfer Paths.............................................................3-60

DKC Journal Transfer Speed......................................................................3-60

Configuration that TagmaStore USP/NSC and USP V is Connected.......................3-60

System Option Mode.................................................................................3-61

Logical Storage System (LDKC) that Can be Connected to TagmaStore

USP/NSC .......................................................................................... 3-61

Volume Pair that Can Create Pairs............................................................. 3-62

Connection with TagmaStore USP/NSC for 3DC Remote Copy Configuration . 3-63 Connection with TagmaStore USP/NSC When Using Extended Consistency

Groups.............................................................................................

3-63

Using the Universal Replicator for z/OS® GUI ........................................ 4-1

Journal Operation Window ................................................................................ 4-2

Pair Operation Window ..................................................................................... 4-7

DKC Operation Window................................................................................... 4-13

Displaying Information about Remote Storage Systems............................... 4-15

Displaying Information about Logical Paths................................................ 4-17

Displaying Information about Ports on the Local Storage System................. 4-18

Usage Monitor Window................................................................................... 4-20

History Window.............................................................................................. 4-21

Optional Operation Window............................................................................. 4-27

EXCTG Operation Window............................................................................... 4-29

Displaying a List of Extended Consistency Groups....................................... 4-32

Displaying a List of Storage Systems in an Extended Consistency Group....... 4-34

Displaying a List of Journal Groups in an Extended Consistency Group ......... 4-35

Configuring Storage Systems and Logical Paths ...................................... 5-1

Reviewing Storage System and Logical Paths...................................................... 5-2

Setup Procedure for Multiple Primary and Secondary Storage Systems........... 5-3

Setup Procedure (When More Than One Primary and Secondary Storage

System are Used)................................................................................ 5-4

Configuring Port Attributes................................................................................5-5

Configuring Storage System Options.................................................................. 5-8

Establishing the Relationship between Primary and Secondary Storage

Systems (Add DKC).................................................................................. 5-10

Changing Options for Logical Paths and Storage Systems .................................. 5-13

Adding Logical Paths....................................................................................... 5-15

Viewing the Status of Logical Paths.................................................................. 5-17

Deleting Logical Paths..................................................................................... 5-20

Managing SIMs............................................................................................... 5-21

Enabling or Disabling SIM Reporting.......................................................... 5-21

Clearing Service Information Messages (SIMs) ........................................... 5-22

Managing Power for Storage Systems and Network Relay Devices...................... 5-23

When Power Stops Unexpectedly .............................................................. 5-23

When the Power is Removed from the Primary Storage System............. 5-23

When the Power is Removed from the Secondary Storage System......... 5-23

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Hitachi Universal Replicator for IBM /OS User’s Guide

When the Power is Removed from Network Relay Devices.....................5-24

Turning Off Power Intentionally.................................................................5-24

When You Power Off the Primary Storage System.................................5-24

When You Power Off the Secondary Storage System.............................5-25

When You Power Off the Primary and Secondary Storage Systems

at the Same Time........................................................................

When You Power Off Network Relay Devices........................................5-27

Removing the Relationship Between the Primary and the Secondary

Storage Systems.......................................................................................5-28

5-26

Configuring Journal Groups................................................................... 6-1

Reviewing Administrator Tasks for Managing Journals..........................................6-2

Registering Journal Volumes in a Journal Group...................................................6-3

Deleting Journal Volumes from a Journal Group...................................................6-9

Displaying Detailed Information about a Journal Group ......................................6-11

Changing Options for a Journal Group...............................................................6-16

Deleting a Journal Group .................................................................................6-21

Splitting a Mirror (Suspending a copy operation)................................................6-22

Restoring a Mirror (Resuming a copy operation)................................................ 6-24

Deleting Data Volumes from a Mirror (Ending a copy operation)..........................6-26

Using Extended Consistency Groups....................................................... 7-1

Registering Journal Groups in an Extended Consistency Group..............................7-2

Manipulating Data Volume Pairs in Extended Consistency Groups..........................7-5

Removing Journal Groups from an Extended Consistency Group ...........................7-7

Forcibly Removing Journal Groups from an Extended Consistency Group ...............7-9

Performing Pair Operations ................................................................... 8-1

Filtering Information in the List in the Pair Operation Window...............................8-2

Creating a Pair of Data Volumes.........................................................................8-5

Displaying Detailed Information about a Pair of Data Volumes ............................8-11

Saving Pair Status Information into a Text File...................................................8-16

Changing Options for a Data Volume Pair..........................................................8-18

Splitting a Pair of Data Volumes .......................................................................8-20

Restoring a Pair of Data Volumes .....................................................................8-23

Releasing a Pair of Data Volumes .....................................................................8-26

Recovering a Pinned Track...............................................................................8-28

Recovering a Pinned Track on a Data Volume.............................................8-28

Recovering a Pinned Track on a Journal Volume..........................................8-29

Usage Monitor Operations..................................................................... 9-1

Reviewing the Usage Monitor Window ................................................................9-2

Starting and Stopping Usage Monitoring............................................................. 9-3

Displaying the Usage Monitor Graph................................................................... 9-4

Saving Monitoring Data in Text Files .................................................................. 9-7

Saving Operation History into a Text File............................................................9-8

Usage Scenarios..................................................................................10-1

Creating a Point-in-Time Copy of Data Volumes................................................ 10-2

Performing Disaster Recovery Operations......................................................... 10-2

Preparing for Disaster Recovery Operations................................................ 10-2

File and Database Recovery Procedures..................................................... 10-3

Switching Operations to the Secondary Site ............................................... 10-4

Transferring Operations Back to the Primary Site........................................ 10-5

Resuming Normal Operations at the Primary Site........................................ 10-6

Disaster Recovery for Multiple Primary and Secondary Storage Systems....... 10-7

Consistency of Data Update Sequence When a Disaster Occurs............. 10-7

Disaster Recovery Procedure.............................................................. 10-8

Disaster Recovery in a 3DC Cascading Configuration................................... 10-9

Recovering from a Disaster at the Main Site in a 3DC Multi-Target

Configuration.................................................................................... 10-9

Recovering from Failures in the Primary Site (When Delta

Resync Operation is Performed)..................................................10-11

Establishing 3DC Delta Resync Operations.......................................................10-13

Performing Failover and Failback for Host Maintenance at the Primary Site.........10-17

Normal Operations..................................................................................10-17

Performing Failover.................................................................................10-17

Performing Failback ................................................................................10-19

Troubleshooting...................................................................................... 1

Troubleshooting..................................................................................................2

General Troubleshooting...................................................................................... 2

Universal Replicator for z/OS® Software Error Codes.............................................. 7

Checking Service Information Messages (SIMs)...................................................... 8

Calling the Hitachi Data Systems Support Center.................................................. 11

Acronyms and Abbreviations ..........................Acronyms and Abbreviations-1

Index............................................................................................Index-1

x Contents

Hitachi Universal Replicator for IBM /OS User’s Guide

Preface

This document describes and provides instructions for using the Universal Replicator for z/OS Hitachi Universal Storage Platform V (USP V) storage system.

Please read this document carefully to understand how to use this product, and maintain a copy for reference purposes.

This preface includes the following information:

 Intended Audience  Product Version  Document Revision Level  Changes in this Revision  Document Organization  Referenced Documents  Document Conventions  Convention for Storage Capacity Values  Getting Help  Comments

software to configure and perform operations on the

Notice: The use of Universal Replicator for z/OS® and all other Hitachi Data Systems products is governed by the terms of your agreement(s) with Hitachi Data Systems.

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Hitachi Universal Replicator for IBM /OS User’s Guide

Intended Audience

This document is intended for system administrators, Hitachi Data Systems representatives, and Authorized Service Providers who are involved in installing, configuring, and operating the Hitachi Universal Storage Platform V storage system.

This document assumes the following:

• The user has a background in data processing and understands RAID

storage systems and their basic functions.

• The user is familiar with the Hitachi Universal Storage Platform V storage

system and has read the Universal Storage Platform V User and Reference Guide.

• The user is familiar with the Storage Navigator software for the Universal

Storage Platform V and has read the Storage Navigator User’s Guide.

• The user is familiar with the operating system and web browser software

on the system hosting the Storage Navigator software.

Product Version

This document revision applies to Universal Storage Platform V microcode 60-

01-3x

and higher.

Document Revision Level

Revision Date Description

MK-96RD625-P February 2007 Preliminary Release MK-96RD625-00 April 2007 Initial Release, supersedes and repl aces MK-96RD625-P MK-96RD625-01 May 2007 Revision 1, supersedes and repl aces MK-96RD625-00

Changes in this Revision

Not applicable to this release.

xii Preface

Hitachi Universal Replicator for IBM /OS User’s Guide

Document Organization

The following table provides an overview of the contents and organization of this document. Click the chapter title The first page of each chapter provides links to the sections in that chapter.

Chapter Description

in the left column to go to that chapter.

Chapter_1_Overview_of_Univers al_Replicator_for_IBM_z/OS®

Chapter_2_About_Universal_Repl icator_Ope

Chapter_3_Preparing_for_Univer sal_Replic

Chapter_4_Using_the_Universal_ Replicator

Chapter_5_Configuring_Storage_ Systems_an

Chapter_6_Configuring_Journal_ Groups

Chapter_7_Using_Extended_Con sistency_Gro

Chapter_8_Performing_Pair_Ope rations

Chapter_9_Usage_Monitor_Oper ations

Chapter_10_Usage_Scenarios

Troubleshooting

Acronyms and Abbreviations Defines the acronyms and abbreviations used in this document. Index Lists the topics in this document in alphabetical order.

This chapter provides an overview of the Hitachi Universal Replicator software and describes its features and benefits.

This chapter provides an overview of Universal Replicator operations.

This chapter describes URz operations involving the USP V primary and secondary storage systems, the remote copy connections between the primary \secondary storage systems, and the host(s) at the primary and secondary sites, as well as the licensed URz remote console software

This chapter how to use the Universal Replicator for z/OS graphical user interface.

This chapter describes the introduction of the URz in your system and explains how to configure your system for remote copy operations.

This chapter explains how to perform remote copy operations between more than one primary and secondary storage system, as well as how to register journal groups in extended consistency groups (abbreviated as EXCTG).

This chapter explains how to perform remote copy operations with UR z, including how to create pairs of a primary data volume and a secondary data volume.

This chapter describes the Usage Monitoring window which enables you to collect I/O statistics for all volumes to be monitored on the connected storage system.

This chapter describes how to use URz to enables to make Point-in-Time (PiT) duplicates of groups of volumes.

This chapter provides troubleshooting information for Universal Replicator for z/OS® and instructions for calling technical support.

Referenced Documents

Hitachi Universal Storage Platform V:

• LUN Manager User’s Guide, MK-96RD615

• User and Reference Guide, MK-96RD635

• Storage Navigator User’s Guide, MK-96RD621

• Business Continuity Manager User and Reference Guide, MK-94RD247

• Data Retention Utility User's Guide, MK-94RD210

• Virtual LVI/LUN and Volume Shredder User's Guide, MK-96RD630

Preface xiii

Hitachi Universal Replicator for IBM /OS User’s Guide

• Universal Volume Manager User's Guide, MK-94RD626

• Guideline for the Timeout Menu Setting When Using At-Time Split Function

at Combining Universal Replicator with ShadowImage

• TrueCopy for IBM z/OS User's Guide, MK-94RD623

Document Conventions

The terms “Universal Storage Platform V” and “USP V” refer to all models of the Hitachi Universal Storage Platform V, unless otherwise noted.

This document uses the following typographic conventions:

Typographic Convention Description

Bold

Italic

screen/code

< > angled brackets

[ ] square brackets

{ } braces

| vertical bar

underline Indicates the default value. Example: [ a | b ]

Indicates text on a window, other than the window title, including menus, menu options, buttons, fields, and labels. Example: Click OK.

Indicates a variable, which is a placeholder for actual text provided by the user or system. Example: copy source-file target-file

Note: Angled brackets (< >) are also used to indicate varia bles. Indicates text that is displayed on screen or entered by the user. Example: #

pairdisplay -g oradb

Indicates a variable, which is a placeholder for actual text provided by the user or system. Example:

Note: Italic font is also used to indicate variables. Indicates optional values. Example: [ a | b ] indicates that you can choose a, b, or

nothing. Indicates required or expected values. Example: { a | b } indicates that you must

choose either a or b. Indicates that you have a choice between two or more options or arguments.

Examples:

[ a | b ] indicates that you can choose a, b, or nothing. { a | b } indicates that you must choose either a or b.

# pairdisplay -g <group>

This document uses the following icons to draw attention to information:

Icon Meaning Description

Note Calls attention to important and/or additional information.

Tip

Caution

WARNING

DANGER

Provides helpful information, guidelines, or suggestions for performing tasks more effectively.

Warns the user of adverse conditions and/or consequences (e.g., disruptive operations).

Warns the user of severe conditions and/or consequences (e.g., destructive operations).

Dangers provide information about how to avoid physical injury to yourself and others.

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Hitachi Universal Replicator for IBM /OS User’s Guide

ELECTRIC SHOCK HAZARD!

ESD Sensitive

Warns the user of electric shock hazard. Failure to take appropriate precautions (e.g., do not touch) could result in serious injury.

Warns the user that the hardware is sensitive to electrostatic discharge (ESD). Failure to take appropriate precautions (e.g., grounded wriststrap) could result in damage to the hardware.

Convention for Storage Capacity Values

Physical storage capacity values (e.g., disk drive capacity) are calculated based on the following values:

1 KB = 1,000 bytes 1 MB = 1,000 1 GB = 1,000 1 TB = 1,000 1 PB = 1,000

Logical storage capacity values (e.g., logical device capacity) are calculated based on the following values:

1 KB = 1,024 bytes 1 MB = 1,024 1 GB = 1,024 1 TB = 1,024 1 PB = 1,024 1 block = 512 bytes

Getting Help

If you need to call the Hitachi Data Systems Support Center, make sure to provide as much information about the problem as possible, including:

• The circumstances surrounding the error or failure.

• The exact content of any error messages displayed on the host system(s).

bytes

• The exact content of any error messages displayed by Storage Navigator.

• The Storage Navigator configuration information (use the FD Dump Tool).

• The service information messages (SIMs), including reference codes and

severity levels, displayed by Storage Navigator.

The Hitachi Data Systems customer support staff is available 24 hours/day, seven days a week. If you need technical support, please call:

• United States: (800) 446-0744

• Outside the United States: (858) 547-4526

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Hitachi Universal Replicator for IBM /OS User’s Guide

Comments

Please send us your comments on this document. Make sure to include the document title, number, and revision. Please refer to specific section(s) and paragraph(s) whenever possible.

• E-mail: doc.comments@hds.com

• Fax: 858-695-1186

• Mail:

Technical Writing, M/S 35-10 Hitachi Data Systems 10277 Scripps Ranch Blvd. San Diego, CA 92131

Thank you! (All comments become the property of Hitachi Data Systems Corporation.)

xvi Preface

Hitachi Universal Replicator for IBM /OS User’s Guide

Overview of Universal Replicator for

IBM z/OS

This chapter provides an overview of the Hitachi Universal Replicator software and describes its features and benefits. This chapter covers the following key topics:

 Hitachi Universal Replicator  Features  Benefits

Chapter 2 About Universal Replicator Operations 1-1

Hitachi Universal Replicator for IBM /OS User’s Guide

Hitachi Universal Replicator

The Hitachi Universal Replicator software intelligently replicates data among storage environments controlled through the Hitachi Universal Storage Platform V, satisfying the most demanding disaster recovery and uptime requirements. Since its introduction on the Hitachi TagmaStore Storage Platform and Network Storage Controller, the Universal Replicator software has set a new standard for data protection by redefining the way asynchronous replication is performed.

Reliable data storage and recovery systems are essential in today’s market climate where downtime can be very costly. Businesses must manage increasing amounts of data across a variety of storage systems and operating environments in various locations, while optimizing usage of storage hardware resources and minimizing the management burden.

To address these needs, Hitachi Universal Replicator software provides the enterprise-class performance associated with storage system-based replication while delivering resilient business continuity. Through the Hitachi RAID storage systems, Universal Replicator provides a powerful data management and recovery solution that replicates data to a variety of storage platforms at one or multiple remote sites. Data is replicated asynchronously over any distance without the need for redundant servers or replication appliances, thus significantly reducing resource consumption.

Universal

The Hitachi Universal Replicator software helps organizations to:

• Lower the cache and resource consumption on production/primary storage

systems

• Improve bandwidth utilization

• Simplify bandwidth planning

• Mitigate the impact of network failures

• Gain more flexibility in trading off between Recovery Point Objective and

cost

• Implement advanced multi–data center support more easily

• Move data among levels of tiered storage systems more easily

• Fully leverage the Universal Storage Platform V and optimize the storage

infrastructure

1-2 Chapter 3 Preparing for Universal Replicator z/OS Operations

Hitachi Universal Replicator for IBM /OS User’s Guide

Features

Hitachi Universal Replicator provides the following key features:

• Heterogeneous Storage System Support

• More Efficient Replication

– Used with the Universal Storage Platform or Network Storage

Controller, Universal Replicator software enables storage management and disaster recovery in heterogeneous systems, providing maximum flexibility and support of enterprise-class environments.

– Universal Replicator software supports any storage connected to a

Universal Storage Platform or Network Storage Controller, permitting data to be copied from any supported device to any other supported device, regardless of operating system or protocol differences. This ensures maximum flexibility for data distribution as well as increased storage utilization and failover options.

– Universal Replicator software uses asynchronous replication driven by

the remote site to minimize impact on primary production systems and takes advantage of journaling rather than cache files to mitigate the high resource usage of other asynchronous approaches.

– Storage usage on the Universal Storage Platform or Network Storage

Controller can be minimal, just enough for the journals.

– Limited use of cache leaves cache for production application usage,

further restoring primary site storage to its intended role as a transaction processing resource, not a replication engine.

– Advanced three data center capabilities provide a choice of cascade or

multi-target configurations (teams with TrueCopy Synchronous software for advanced configurations).

– Consistency groups can span multiple storage systems for large

enterprise-class applications requiring unmatched scalability and data integrity.

Note: Please check with your Hitachi Data Systems representative for detailed feature availability information.

Chapter 2 About Universal Replicator Operations 1-3

Hitachi Universal Replicator for IBM /OS User’s Guide

Benefits

The business benefits of Hitachi Universal Replicator include:

• Ensure Business Continuity

– Simplifies implementation to meet the most demanding disaster

recovery and uptime requirements, regardless of the type of supported

storage platform hosting the business-critical data

– Supports availability of up-to-date copies of data in dispersed locations

by leveraging Hitachi TrueCopy

Synchronous software

– Maintains integrity of a replicated copy without impacting processing,

even when replication network outages occur or optimal bandwidth is

not available

– Works with Universal Storage Platform V replication technology to

greatly enhance administrative productivity and response to and

proactive aversion of crises

• Optimize Resource Usage

– Leverages advanced technology to maintain data integrity and optimize

the storage/IT infrastructure for protection of data from any application

across a variety of hardware and software platforms

– Optimizes storage resources for more efficient data protection over any

distance

– Significantly reduces cache utilization and increases bandwidth

utilization by leveraging performance-optimized disk-based journals

– Reduces overhead and application impact at production site by placing

more of the workload on remote site

– Centralizes operations for management resources and provides secure

management of data-related operational risk

• Improve Operational Efficiency and Resiliency

– Simplifies consolidation/aggregation and mapping of data value to the

cost of storage

– Supports planned site outages – Keeps logging changes in the event of network problems between sites – Reduces costs—requires only one product to provide asynchronous copy

across all attached storage systems

• Synergy with Hitachi Business Continuity Framework

– Builds on the data integrity heritage of Hitachi open-systems and

mainframe remote replication software

– Provides unified, simplified management via Hitachi HiCommand®

Device Manager and Hitachi Business Continuity Manager software for

IBM® z/OS®

1-4 Chapter 3 Preparing for Universal Replicator z/OS Operations

Hitachi Universal Replicator for IBM /OS User’s Guide

– Integrates tightly with other Hitachi software products supporting

business continuity, further expanding capabilities

Business Solutions

Hitachi Data Systems and its Hitachi TrueNorth™ Channel Partners provide cost-effective storage products and solutions that leverage world-renowned Hitachi global R&D resources to deliver performance, availability, and scalability—supporting business-critical applications and strengthening competitive advantage.

Complementary solutions for Universal Replicator software include:

• Hitachi HiCommand

• Hitachi TrueCopy

like Hitachi storage systems

• Hitachi ShadowImage™ Heterogeneous In-System Replication software for

non-disruptive, high-speed data replication within any Hitachi storage system

Replication Monitor software

Synchronous software, which duplicates data between

Hitachi Business Continuity Manager software for managing TrueCopy and ShadowImage solutions for IBM

z/OS® mainframe

Chapter 2 About Universal Replicator Operations 1-5

Hitachi Universal Replicator for IBM /OS User’s Guide

1-6 Chapter 3 Preparing for Universal Replicator z/OS Operations

Hitachi Universal Replicator for IBM /OS User’s Guide

About Universal Replicator Operations

This chapter provides an overview of Universal Replicator operations:

 Functionality Overview  Components  Remote Copy Operations  Journal Processing  URz Delta Resync Operation  Pair Status  Business Continuity Manager Support

Chapter 3 Preparing for Universal Replicator z/OS Operations 2-1

Hitachi Universal Replicator for z/OS User’s Guide

Functionality Overview

Hitachi Universal Replicator represents a unique and outstanding disaster recovery solution for large amounts of data that span multiple volumes. The UR group-based update sequence consistency solution enables fast and accurate database recovery, even after a “rolling” disaster, without the need for time-consuming data recovery procedures. The user-defined UR journal groups (volume groups) at the secondary site can be recovered with full update sequence consistency but behind the primary site due to asynchronous copy operations. This functionality also provides protection for writedependent applications in the event of a disaster.

UR enables you to create duplicate volumes by copying data from the primary data volumes in the primary storage system to the secondary data volumes in the secondary storage system at the remote location. To perform this function, the journal obtain function at the primary site, the journal copy function between the primary and secondary sites, and the journal restore function at the secondary site are performed sequentially with the primary and secondary data volumes and the journal volumes. Write sequence consistency for the primary data volume at the primary site is also maintained for the secondary data volume at the secondary site by the write sequence number to be assigned for the journal data with the journal obtaining function, enabling you to configure the duplicate system which has data integrity. UR reduces the occurrence of pair suspensions due to restrictions of data transfer from the primary site to the secondary site by storing the write data from the host in the master and restore journal volumes, providing a high-reliability duplication system.

Figure 2-1 UR Components for Fibre-Channel Connection shows an overview of UR operations.

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Hitachi Universal Replicator for IBM /OS User’s Guide

Primary site

Secondar

site

Primary data volume

Journal obtain function

Figure 2-1 UR Components for Fibre-Channel Connection

Journal Obtain

Journal obtain is the function to store the already stored data in the primary data volume as a base-journal in the journal volume at the primary site. And then, this function stores the write data as a journal data in the journal volume with every update of the primary data volume according to the write instruction from the host. The journal obtain operation is performed according to the instruction of add pair or Resume Pair operation from the primary site. The write sequence number from the host is assigned to the journal data. According to this information, the write sequence consistency at the secondary site can be maintained. The update data from the host is kept in the cache. Therefore, the journal obtain function for the update data is performed asynchronously from the time the storage system receives the update data from the host and stores the update data to the data volume.

Primary host

Write instruction

Issuing Read Journal command

Secondary host

Master

ournal

Primar

volume

storage system Secondary storage system

Journal copy function

Restore

ournal

volume

Secondary data volume

Journal restore function

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Journal Copy

Journal copy is the function to copy the data in the master journal volume at the primary site to the restore journal volume at the secondary site. The secondary storage system issues the read journal command to the primary storage system to request to transfer the data that is stored in the master journal volume according to the pair create or Resume Pair operation instruction from the primary site. The primary storage system transfers the data in the journal volume to the secondary site according to the read journal command if it has the journal data that should be sent. If the primary storage system does not have the journal data, the information is sent. The secondary storage system stores the journal volume data that is sent from the primary site in the restore journal volume at the secondary site. The read journal commands are issued repeatedly and regularly from the secondary site to the primary site until the journal operation is stopped. After the data are restored, the journal sequence numbers are informed from the secondary site to the primary site when the read journal command is issued. According to this information, the journal data at the primary site are discarded.

Journal Restore

Journal restore is the function to reflect the stored data in the restore journal volume to the secondary data volume at the secondary site. The data in the restore journal volume are restored to the secondary data volume according to the write sequence number. This will ensure the write sequence consistency between the primary and secondary data volumes. After the journal data are restored to the secondary data volume, the journal data are discarded at the secondary site.

Components

URz operations involve the USP V storage systems at the primary and secondary sites, the physical communications paths between these storage systems, and the USP V URz remote console software. URz copies the original online data at the primary site to the offline backup volumes at the secondary site via the dedicated fibre-channel remote copy connections using a journal volume. You can operate the URz software with the user-friendly GUI environment using the USP V URz remote console software.

Note: Host failover software is required for effective disaster recovery with URz.

For management of URz journal groups that consist of journal volumes located in multiple storage systems, host I/O time stamping function (provided by MVS DFSMSdfp) is a requisite functional item. An error reporting communications (ERC) feature is essential for URz to be able to recover data lost in a disaster.

Figure 2-2 shows the URz components and their functions:

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)

(

Host processor

at the primary site

MVS) Time stamping function (MVS) Time stamping function

Error Reporting

Communications

URz volume pair

Host processor

at the secondary site

Disk subsystemStorage system

e system (LDKC

et port

Secondar

data

volume

CHT

RCU

Restore

journal volume

SVP

Restore journal group

Primar

CHT

Primary

data

volume

SVP

Master journal group

Storage Navigator computer

subsystem(LDKC

MCU

Internal LAN (TCP/IP)

Initiator port

Master journal volume

RCU target port

Remote copy

connection

Copy direction

Stora

RCU tar

Initiator port

Storage Navigator computer

Figure 2-2 URz components

Figure 2-3 shows the plural secondary storage systems connection configuration of URz. By connecting one primary storage system with more than one secondary storage system, you can create a volume pair that has a one-to-one relationship for each journal group.

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Primary storage system

Secondary storage system

Primary

data

volume

Master journal group 0

Primary

data

volume

Master journal group 1

Primary

data

volume

Master journal group n

Master journal

volume

Master journal volume

Master

journal

volume

Secondary

data

volume

Restore

journal

volume

Restore

journal

volume

Secondary storage system

Secondary

data

volume

Restore

journal

volume

Secondarystorage system

Secondary

data

volume

Figure 2-3 Connection Confi guration of Plural Secondary Storage

systems

This URz components describes:

• USP V storage system

• Logical DKC

• Main and remote control units (primary storage systems and secondary

storage systems)

• Journal group

• Data volume pair

• Journal volume

• Remote copy connections

• Initiator ports and RCU target ports

• USP V URz remote console software

• Host I/O time stamping function

• Error reporting communications (ERC)

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USP V Storage Systems

URz operations involve the USP V storage systems at the primary and secondary sites. The primary storage system consists of the main control unit (primary storage system) and SVP. The secondary storage system consists of the remote control unit (secondary storage system) and SVP.

To provide greater flexibility and to enable the USP V to be tailored to unique customer operating requirements, operational parameters, or optional modes, are available in URz for the USP V storage system. At installation, the USP V modes are set to their default values, so make sure to discuss these settings with your Hitachi team. The USP V modes can only be changed by your Hitachi representative.

Universal Replicator for z/OS® Software

USP V Storage Navigator Java applet program product includes URz for the USP V storage system. The USP V Storage Navigator software communicates with the SVP of each USP V storage system via defined TCP/IP connections. For further information on USP V Storage Navigator operations, please refer to the Storage Navigator User's Guide, or contact your Hitachi account team.

The Storage Navigator PC at the primary site must be attached to the primary storage system. You should also attach a Storage Navigator PC at the secondary site to all secondary storage systems. Having a Storage Navigator PC at the secondary site enables you to change the URz parameter of the secondary storage system and access the URz secondary data volume (e.g. for the maintenance of media). If you need to perform URz operations in the reverse direction from the secondary site to the primary site (e.g., disaster recovery), the USP V URz software simplifies and expedites this process.

Note: If the USP V Storage Navigator remote console PC is not installed, please

contact your Hitachi account team for information on URz configuration services.

Main and Remote Control Units

The main control unit (primary storage system) and remote control unit (secondary storage system) control URz operations:

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• The primary storage system is the control unit in the primary storage

system which controls the primary data volume of the URz pairs and master journal volume. The Storage Navigator remote console PC must be LAN-attached to the primary storage system. The primary storage system communicates with the secondary storage system via the dedicated remote copy connections. The primary storage system controls the host I/O operations to the URz primary data volume and the journal obtain operation of the master journal volume as well as the URz initial copy and update copy operations between the primary data volumes and the secondary data volumes.

• The secondary storage system is the control unit in the secondary storage

system which controls the secondary data volume of the URz pairs and restore journal volume. The secondary storage system controls copying of journals and restoring of journals to secondary data volumes. The secondary storage system assists in managing the URz pair status and configuration (e.g., rejects write I/Os to the URz secondary data volumes). The secondary storage system issues the read journal command to the primary storage system and executes copying of journals. The secondary Storage Navigator PC should be connected to the secondary storage systems at the secondary site on a separate LAN. The secondary storage systems should also be attached to a host system to allow sense information to be reported in case of a problem with a secondary data volume or secondary storage system and to provide disaster recovery capabilities.

The USP V can function simultaneously as a primary storage system for one or more primary data volumes and as a secondary storage system for one or more secondary data volumes, provided the remote copy connections and fibre-channel interface ports are properly configured. The URz software allows you to specify the secondary storage system from the connected primary storage system. URz operations can be performed on all LDEVs except for the USP V command device. For further information on the USP V command device, please refer to the Business Continuity Manager User and Reference Guide.

Note: When you configure a URz journal group pair, you have to specify the

serial numbers of primary storage systems and secondary storage systems. You have to specify the different serial numbers of primary storage system and secondary storage system for the same URz journal group pair. If you have to specify the same serial number, please contact your Hitachi account team.

Logical DKC (LDKC)

The USP V storage system controls the CU (Control Unit) by dividing the CUs in to groups of 255 CUs. Each group is a storage system that logically exists in USP V (logical storage system). These groups are called a “logical DKC” or an “LDKC (L system and number “00” and “01” is assigned to each LDKC.

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ogical disk controller)”. There are 2 LDKCs in the USP V storage

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