HP XP External Storage Software User Manual

HP StorageWorks XP24000 External Storage Software User’s

Guide

Part number: T5206–96001

irst edition: June 2007

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Revision History

Edition

First

Date

June 2007

Description

This edition applies to microcode version 60-01-31-00/00 or later.

Contents

AboutthisGuide .......................... 11

IntendedAudience...................................... 11

RelatedDocumentation.................................... 11

DocumentConventions.................................... 11

ConventionsforStorageCapacityValues ............................ 11

WindowIllustrations.................................... 12

HPTechnicalSupport.................................... 12

SubscriptionService .................................... 12

HPWebsites ....................................... 12

Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1OverviewofHPStorageWorksXPExternalStorageSoftware. . . . . . . 13

UnifyingCopyOperationsbetweenDifferentStorageSystems .................. 13

UnifyingConnectionsfromaHosttoDifferentStorageSystems .................. 14

2AboutExternalStorageOperations ................. 17

ConnectingExternalStorageSystem ............................. 17

ExternalStorageComponents................................ 18

StorageSystemsandCross-subsystemPaths ........................ 19

VolumesandMappingPaths .............................. 19

ExternalStorageOperations................................. 20

ConﬁguringExternalStorage ................................ 20

ChoosingtheExternalPort ............................... 21

ChoosingandMappingExternalVolumes......................... 21

RegisteringaVolumetoanExternalVolumeGroup(ExG) .................. 21

ConﬁguringExternalVolumeAttributes .......................... 22

Cross-subsystemPaths ................................. 23

PathMode .................................... 23

ExamplesofAlternatePaths............................. 23

ExamplesofSwitchingI/OExecutionPathstoAlternatePaths............... 25

ConnectingMainframeVolumes............................. 29

ConnectingOpenSystemsVolumes............................ 30

ChoosingMappingPolicy.................................. 30

DifferencebetweenAutomaticMappingandManualMapping................ 30

PortDiscoveryandVolumeDiscovery........................... 30

UsingaMappedExternalVolumefromaConnectedHost.................... 31

StoringNewDataintheMappedExternalVolume ..................... 31

UsingExistingDataintheMappedExternalVolume .................... 32

InteroperabilitywithotherProductsandFunctions........................ 33

HPStorageWorksXPLUNManager ........................... 33

HPStorageWorksXPLUNExpansion(LUSE)........................ 33

HPStorageWorksXPVirtualLVI/LUN(VLL)......................... 34

CacheResidencyManager ............................... 34

HP StorageWorks XP Performance Monitor and HP StorageWorks XP Auto LUN Software . . . . . 34

HPStorageWorksXPContinuousAccessSoftware ..................... 34

TrueCopyforMainframe ................................ 34

HPStorageWorksXPContinuousAccessJournalSoftware .................. 34

UniversalReplicatorforMainframe............................ 35

HPStorageWorksXPBusinessCopySoftware ....................... 35

ShadowImageforMainframe .............................. 35

XP24000 External Storage Software User’s Guide

HPStorageWorksXPSnapshot.............................. 35

SNMPAgent ..................................... 35

ExamplesofUsingExternalVolumeswithOtherProducts .................... 35

AutoLUNOperations ................................. 35

ContinuousAccessOperations.............................. 36

ContinuousAccessJournalOperations .......................... 37

BusinessCopyOperations ............................... 39

XPSnapshotOperations ................................ 40

3PreparingforExternalStorageOperations ............. 43

SystemRequirements.................................... 43

StorageSystemsSupportedasExternalStorageSystems................... 43

ExternalStorageRequirements.............................. 43

GuidelinesforExternalStorageOperations .......................... 44

MappingGuidelines.................................. 44

RecommendedApplicationsaccordingtotheHDDType................... 44

CapacityGuidelines.................................. 45

GuidelinesforMainframeVolumes............................ 47

VolumeAttributeGuidelines............................... 47

CreatingLUSEVolumeGuidelines ............................ 47

MaintenanceGuidelinesforanExternalStorageSystem................... 47

PerformanceandStatusGuidelines............................ 48

RAIDLevelConsiderations ............................... 48

InstallingandUninstallingExternalStorage .......................... 48

InstallingExternalStorage................................ 49

UninstallingExternalStorage .............................. 49

StartingExternalStorage .................................. 49

4UsingtheExternalStorageGUI ................... 51

VolumeOperationWindow................................. 51

VolumeOperationTree................................. 52

VolumeOperationList(WhenSubsystemorProductNameisClicked)............. 53

VolumeOperationList(WhenPathGroupisClicked) .................... 54

PreviewDialogBox .................................. 57

PathOperationWindow .................................. 58

PathOperationTree .................................. 60

PathOperationList(WhenSubsystemisClicked)...................... 61

PathOperationList(WhenProductNameisClicked) .................... 62

PathOperationList(WhenPortorWWNisClicked) .................... 63

PortOperationWindow .................................. 63

PortOperationTree .................................. 65

PortOperationList................................... 65

5PerformingExternalStorageOperations .............. 67

OverviewofSettingOperations ............................... 67

SettingPortofExternalStorageSystem ............................ 68

SettingPortAttributeforLocalStorageSystem ......................... 68

MappinganExternalVolumeAutomatically.......................... 69

MappinganExternalVolumeManually............................ 69

AddVolumeDialogBox ................................ 71

SetExternalVolumeParameterDialogBox......................... 72

LDEVMapping(Auto)DialogBox ............................ 74

LDEVMapping(Manual)DialogBox........................... 75

SSIDDialogBox.................................... 76

Example:HowtoMapLDEVsAutomatically........................ 77

Example:HowtoMapLDEVsManually.......................... 77

SettingtheCross-subsystemPaths............................... 78

ConﬁgureCross-subsystemPathsDialogBox........................ 78

ConﬁguringCross-subsystemPath ............................ 81

Changing the ConﬁguredCross-subsystemPathPriority ................... 82

Canceling the Cross-subsystem Path Conﬁguration ..................... 83

ChangingtheCross-subsystemPath............................ 83

CheckingtheExternalVolumeDetails............................. 83

LDEVInformationDialogBox .............................. 84

MappingPathInformationDialogBox .......................... 84

TurningOnorOfftheStorageSystem............................. 87

CommandsforTurningOnorOffOnlytheExternalStorageSystem.............. 87

TurningOnorOffOnlytheExternalStorageSystem .................... 88

TurningOnorOffOnlytheLocalStorageSystem...................... 88

TurningOnorOffBothStorageSystems.......................... 89

DisconnectingExternalStorageSystemorDisconnectingExternalVolume ............. 89

DisconnectingAllExternalVolumes(DisconnectSubsystem) ................. 90

DisconnectinganIndividualExternalVolume(DisconnectVolume)............... 90

CheckingConnectionStatusandResumingExternalVolumeOperation .............. 91

ResumingAllExternalVolumes(CheckPaths&RestoreVolume)................ 91

ResuminganIndividualExternalVolume(CheckPaths&RestoreVolume)............ 92

StoppingtheUseofPathstotheExternalVolume(DisconnectPaths)................ 92

RestoringthePathstotheExternalVolume(CheckPaths)..................... 93

ChangingtheCacheModeSettingoftheExternalVolume.................... 93

Changing the InﬂowControlSettingoftheExternalVolume ................... 94

ChangingthePortSettingoftheExternalStorageSystem .................... 94

ChangeWWNParameterDialogBox .......................... 95

EditingMappingPolicy................................... 95

EditPolicyDialogBox ................................. 95

DeletingtheExternalVolumeMapping ............................ 96

6RemoteCommandDevices.................... 99

OverviewofRemoteCommandDevices............................ 99

GuidelinesforRemoteCommandDevices........................... 100

MappingaCommandDeviceasaRemoteCommandDevice .................. 102

Using Continuous Access or Continuous Access Journal with Remote Command Device . . . . . . . . 102

ProceduretoUseInitiator/ExternalMIXMode ....................... 104

RestrictionsonInitiator/ExternalMIXMode ........................ 105

7Troubleshooting......................... 107

TroubleshootingforExternalStorage ............................. 107

CallingHPTechnicalSupport ................................ 111

AConnectingExternalStorageSystems................ 113

TagmaStoreAMSStorageSystem,TagmaStoreWMSStorageSystem............... 113

System Parameters for Connecting TagmaStore AMS Storage System, TagmaStore WMS Storage

System........................................ 113

Relationship between Serial Number in Device List of Volume Operation Window and TagmaStore

AMSStorageSystem,TagmaStoreWMSStorageSystemModel ............... 114

Relationship between WWN of Port of TagmaStore AMS Storage System or TagmaStore WMS

StorageSystemandController.............................. 115

Path Status and Examples of Recovery Procedure (For TagmaStore AMS Storage System, TagmaStore

WMSStorageSystem) ................................. 115

Thunder9500VStorageSystem ............................... 116

SystemParametersforConnectingThunder9500VStorageSystem .............. 116

RelationshipbetweenSerialNumberandThunder9500VModel............... 118

Relationship between WWN of Port of Thunder 9500V Storage System and Controller . . . . . . 118

Path Status and Examples of Recovery Procedure (For Thunder 9500V Storage System) . . . . . . 119

USPVStorageSystem ................................... 119

PathStatusandExamplesofRecoveryProcedure(ForUSPVStorageSystem).......... 119

TagmaStoreUSPStorageSystem,TagmaStoreNSCStorageSystem................ 120

XP24000 External Storage Software User’s Guide

Path Status and Examples of Recovery Procedure (For TagmaStore USP Storage System, TagmaStore

NSCStorageSystem).................................. 120

Lightning9900VStorageSystem............................... 121

Path Status and Examples of Recovery Procedure (For Lightning 9900V Storage System) . . . . . 121

Lightning9900StorageSystem ............................... 122

Path Status and Examples of Recovery Procedure (For Lightning 9900 Storage System) . . . . . . 122

SVS200StorageSystem .................................. 123

PathStatusandExamplesofRecoveryProcedure(ForSVS200StorageSystem)......... 123

EVAStorageSystem .................................... 124

SystemParameterSettingsforConnectingEVAStorageSystem................ 124

IdentifyingLogicalVolumeofEVAStorageSystem(UsingCharacteristic2)........... 124

NoteonBehaviorofAlternatePathwhenEVAStorageSystemisConnected .......... 125

SystemParameterSettingsforConnectingSunStorEdge6120/6320 ............... 125

SystemParameterSettingsforConnectingStorageTekFlexLine380 ................ 126

SystemParameterSettingsforConnectingCLARiiONCX600................... 126

Non-HPStorageSystems .................................. 126

BRequiredVolumeCapacityforEachEmulationType.......... 127

HowtoFigureOutRequiredExternalVolumeCapacity ..................... 127

CapacityListforEachEmulationType............................. 129

CAdjustingVolumeCapacitiesforPairs ............... 133

DAcronymsandAbbreviations ................... 135

Index .............................. 137

Figures

Type(ExampleoftheOPEN-3emulationtype).................... 46

EmulationType................................. 47

UnifyingCopyOperationsbetweenDifferentStorageSystems ............ 14

UnifyingConnectionsfromaHosttoDifferentStorageSystems ............ 15

ConceptofExternalStorage........................... 18

ExternalStorageComponents .......................... 19

ExampleofAlternatePathSetting ........................ 24

ExampleofAvailableAlternatePathSetting .................... 24

Example of U

WhenthePathModeisMultiMode ....................... 26

WhenthePathModeisSingleMode....................... 27

SingleModewithAlternatePathsinNormalandStandby .............. 28

Single Mod

Storing the New Data in the Mapped External Volume . . . . . . . . . . . . . . . 32

UsingtheExistingDataintheMappedExternalVolume............... 33

ExampleoftheAutoLUNOperation ....................... 36

ExampleoftheContinuousAccessOperation ................... 37

ExampleoftheContinuousAccessJournalOperation................ 39

ExampleoftheBusinessCopyOperation ..................... 40

ExampleoftheXPSnapshotOperation ...................... 41

Exampl When the External Volume Capacity is Bigger than the Basic Capacity of Speciﬁed Emulation

When the External Volume Capacity is Smaller than the Basic Capacity of Speciﬁed

VolumeOperationWindow........................... 51

VolumeOperationListwhenSubsystemoraProductNameisClicked ......... 54

VolumeOperationListwhenPathGroupisClicked ................. 55

PreviewDialogBox .............................. 58

PathOperationWindow ............................ 59

PathOperationListwhenSubsystemisClicked................... 61

PathOperationListwhenProductNameisClicked ................. 62

PathOperationListwhenPortorWWNisClicked ................. 63

PortOperationWindow ............................ 64

perationsofMakingExternalVolumesUsablefromaHost ............. 67

AddVolumeDialogBox ............................ 71

SetExternalVolumeParameterDialogBox..................... 73

LDEVMapping(Auto)DialogBox ........................ 74

LDEVMapping(Manual)DialogBox....................... 75

navailableAlternatePathSetting ................... 25

ewithAlternatePathsinStandbyonly.................. 29

eofExternalVolumeof2TBorLess .................... 46

XP24000 External Storage Software User’s Guide

SSIDDialogBox................................ 76

SetSSIDDialogBox .............................. 77

ExampleofLDEVMapping(Manual)DialogBox.................. 78

ConﬁgureCross-subsystemPathsDialogBox.................... 79

PortDiscoveryDialogBox............................ 80

Pop-up Menu of ConﬁgureCross-subsystemPathsDialogBox............. 82

LDEV Inform

MappingPathInformationDialogBox ...................... 85

ChangeWWNParameterDialogBox ...................... 95

EditPolicyDialogBox ............................. 96

Outline of

Difference between Standard Mode and Initiator/External MIX Mode . . . . . . . . . 103

Example of Using Continuous Access or Continuous Access Journal with Remote Command

ationDialogBox .......................... 84

RemoteCommandDevice ....................... 100

Device..................................... 104

Conﬁguration Example for which Logical Volumes Cannot be Identiﬁed only by Characteristic

1....................................... 125

IdeaofLDEVCapacity............................. 128

Example of How to Figure Out the Volume Capacity (In the Case of OPEN-3) . . . . . . 129

Copying Data from External Storage System (Using an External Volume as P-VOL) . . . . 133

Copying Data to External Storage System (Setting an External Volume as S-VOL) . . . . 134

Tables

1 2

3 4 5 6 7 8 9

11 12 13 14 15 16 17 18 19

25 26

27 28 29 30

32 33

DocumentConventions .............................. 11

ExternalStorageRequirements .......................... 44

When the Emulation Type of the External Volume is for OPEN ... ... ... ... 45

When the Emulation Type of the External Volume is for Mainframe . . . . . . . . . . 45

TheItems Clickedinthe Volume OperationTreeand theContentsDisplayed . . . . . . 52

Pop-up Menu that can be Displayed in the Volume Operation Tree . ... ... ... 53

Status of the External Volume displayed in the Ext. VOL Status ... ... ... ... 54

Pop-up Menu in the External Volumes (Volume Operation Window) . ... ... ... 57

Pop-up Menu in the Cross-subsystem Paths (Volume Operation Window) . . . . . . . . 57

The Items Clicked in the Path Operation Tree and the Contents Displayed . . . . . . . . 60

Status of the Cross-subsystem Path displayed in the Status .. ... ... ... ... 62

Pop-up Menu in the Path Operation List (when Subsystem is clicked) . ... ... ... 62

Pop-up Menu in the Path Operation List (when Product Name is clicked) . . . . . . . . 63

Pop-upMenuinthePortInformation ....................... 66

pMenuintheAddVolumedialogbox .. ... ... ... ... ... ... 72

Pop-u

Pop-up Menu in the Conﬁgure Cross-subsystem Paths dialog box . . ... ... ... 80

Status of the Mapping Paths in the Mapping Path Information Dialog Box . . . . . . . 86

Displayed Information in Device Column for Remote Command Device ... ... ... 101

ictionsonRemoteCommandDevice ..................... 102

Restr

GeneralTroubleshootingforExternalStorage . ... ... ... ... ... ... 107

System Parameter Settings (TagmaStore AMS Storage System and TagmaStore WMS Storage

System) .................................... 114

Relationship between Serial Number and Storage System Model of TagmaStore AMS Storage

System,TagmaStoreWMSStorageSystem ... ... ... ... ... ... ... 115

ationship between WWN of Port and Controller (TagmaStore AMS Storage System,

Rel

TagmaStoreWMSStorageSystem) ........................ 115

Path Status and Examples of Recovery Procedure (For TagmaStore AMS Storage System,

TagmaStoreWMSStorageSystem) ........................ 116

System Parameter Settings (Thunder 9500V Storage System) . ... ... ... ... 117

Relationship between Serial Number and Storage System Model of Thunder 9500V Storage

System .................................... 118

lationship between WWN of Port and Controller (Thunder 9500V Storage System) . . 118

Path Status and Examples of Recovery Procedure (For Thunder 9500V Storage System) . . 119

Path Status and Examples of Recovery Procedure (For USP V Storage System) . . . . . . 120

Path Status and Examples of Recovery Procedure (For TagmaStore USP Storage System,

TagmaStoreNSCStorageSystem) ......................... 121

Path Status and Examples of Recovery Procedure (For Lightning 9900V Storage System) . 122

Path Status and Examples of Recovery Procedure (For Lightning 9900 Storage System) . . 123

Path Status and Examples of Recovery Procedure (For SVS200 Storage System) . . . . . 124

XP24000 External Storage Software User’s Guide

SystemParameterSettingsforConnectingEVAStorageSystem ............ 124

SystemParameterSettingsforConnectingSunStorEdge6120/6320.......... 126

SystemParameterSettingsforConnectingStorageTekFlexLine380 .......... 126

SystemParameterSettingsforConnectingCLARiiONCX600............. 126

Maximum Usable Capacity of External Volume . . . . . . . . . . . . . . . . . . . 127

LDEVCapacityInformationforEachEmulationType................. 130

VolumeCapacityInformationonEachEmulationType................ 131

AcronymsandAbbreviations .......................... 135

About this Guide

This user’s guide describes and provides instructions for performing External Storage operations on the HP storage system.

The term storage system in this guide refers to an HP StorageWorks XP24000 Disk Array.

Intended Audience

This user’s gu

• the user has a background in data processing and understands RAID storage systems and their

basic functions,

• the user is familiar with the storage system and the Remote Web Console computer,

• the user has r

Guide,and

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

Remote Web Console remote console software. For details StorageWorks XP24000 Remote Web Console User’s Guide.

Conventions for Storage Capacity Values

HP XP storage systems use the following values to calculate physical storage capacity values (hard disk drives):

• 1 KB (kilobyte) = 1,000 bytes

bytes

• 1MB (megabyte) =1,000

• 1 GB (gigabyte) = 1,000

• 1 TB (terabyte) = 1,000

XP24000 External Storage Software User’s Guide

HP XP storage systems use the following values to calculate logical storage capacity values (logical devices):

• 1KB(kilobyte)=1,024bytes

bytes

• 1MB(megabyte)= 1,024

• 1GB (gigabyte) = 1,024

• 1 TB (terabyte) = 1,024

• 1 block = 512 bytes

Window Illus

The windows shown in this guide were displayed on a Windows computer with the Internet Explorer browser. The windows may appear different on your computer depending on the operating system and browser being used. Window contents also vary depending on installed program products and the storage s

trations

ystem being managed.

HP Technical Support

For worldwide technical support information, see the HP support website:

ttp://www.hp.com/support

Before contacting HP, collect the following information:

• Product model names and numbers

• Technical support registration number (if applicable)

• Product serial numbers

• Error messages

• Operating system type and revision level

• Detailed questions

Subscription Service

HP recommends that you register your product at the Subscriber’s Choice for Business website:

ttp://www.hp.com/go/e-updates

After registering, you will receive e-mail notiﬁcation of product enhancements, new driver versions, ﬁrmware updates, and other product resources.

HP Websites

For additional information, see the following HP websites:

ttp://www.hp.com

• h

• http://www.hp.com/go/storage

• http://www.hp.com/service_locator

• http://www.hp.com/support/manuals

Documentation Feedback

HP welc To make comments and suggestions about product documentation, send a message to

storagedocsFeedback@hp.com. All submissions become the property of HP.

omes your feedback.

About this Guide

1 Overview of HP StorageWorks XP External Storage Software

External Storage is a program product that enables you to operate multiple storage systems, including the HP StorageWorks XP24000 Disk Array, as if they are all in one storage system. This allows system administrators to easily manage different types of multiple storage systems.

For example, External Storage enables you:

• To unify copy operations between different storage systems.

• To unify connections from a host to different storage systems.

The following subsections explain how the copy operations and the host connection will change after Universal Volume Manager is installed.

Unifying Copy Operations between Different Storage Systems

When you copy data between different storage systems, the copy operations are usually different depending

on the storage system which you use.

If you inst you copy data between volumes in the storage system.

• To copy databetween avolumeinthe storagesystemandavolumeinanexternalstorage system.

• To copy dat

all External Storage, you can perform the following copy operations in the same way as when

a between a volume in an external storage system and a volume in another external

storage system.

XP24000 External Storage Software User’s Guide

Figure 1 Unifying Copy Operations between Different Storage Systems

Unifying Connections from a Host to Different Storage Systems

When a system has multiple storage systems, a host usually needs to connect all storage systems. When a system administrator conﬁgures the connections from a host to volumes, they need to follow the different instructions depending on the storage systems.

If you install External Storage, a system administrator only needs to conﬁgure the connection from a host to the storage system. After the conﬁguration is completed, a host can manipulate volumes in the external storage system in the same way as volumes in the storage system.

Overview of HP StorageWorks XP External Storage Software

Figure 2

Unifying Connections from a Host to Different Storage Systems

XP24000 External Storage Software User’s Guide

Overview of HP StorageWorks XP External Storage Software

2 About External Storage Operations

This chapter explains the functions and the applications of External Storage. This user’s guide uses the following terms:

• An original storage system is called the local storage system.

• A connected storage system is called the external storage system (other user’s guides call this

the external device).

• The volume managed in the local storage system is called the internal volume.

• The volume in the external storage system is called the external volume.

Connecting

External St systems, and other vendors’ storage systems (such as IBM or EMC) as connectable external storage systems. Hosts will recognize these volumes as internal volumes of the storage system.

External volume mapping is required for manipulating external volumes from storage system. Mapping means assigning the management numbers to the external volumes. This management numbers are required for the manipulating external volumes from storage system. By assigning the managemen not only i XP Remote sequential number (Example: E2-1, E50-3). For details on the external volume group number, see “Registering a Volume to an External Volume Group (ExG)”onpage21.

Figure 3 on page 18 shows the idea of connection between a storage system and an external storage

system which are connected by the External Storage function. In the Figure 3 on page18, theexternal storage system is connected to the external port of the storage system via a switch using the Fibre Channel interface. The external port is a kind of port attribute, which is used for External Storage. In the

3 on page 18, the external volumes are mapped as storage system volumes.

Figure

Note:

Make sure that you do not access the external volume, which has been mapped as a storage system volume, from the host that is connected to the external storage system. Also make sure that you do not access the mapped external volume using the function (for example, copy function) of the external storagesystem. Once youhavemappedanexternalvolumeasastoragesystem volume, you haveto access the mapped external volume only from the storage system side.

From the host, you can access the external storage system volumes that have not been mapped as

Note

the storage system volumes. There is no restriction.

External Storage System

orage enables you to use HP storage systems, original equipment manufacturer (OEM) storage

t numbers to the external volumes, the system administrator will be able to manipulate

nternal volumes of storage system but also external volumes using HP StorageWorks

Web Console. The management numbers consist of external volume group number -

XP24000 External Storage Software User’s Guide

Figure 3 Concept of External Storage

By mapping an external volume as an internal volume using External Storage as shown in

Figure 3

if it is a

on page 18, it becomes possible to operate the external volume using Remote Web Console as

volume in the storage system.

External Storage Components

Systems using External Storage usually contain the following components:

• Local storage system (storage system)

• External storage system

• Remote Web Console computer

• External Storage

• External volume

• Internal volume, which is a virtual representation of an external volume

• LDEVs(LogicalDevices)inanexternalvolume

• Cross-subsystem path

• Mapping path

The following ﬁgure illustrates the relations of the External Storage components.

About External Storage Operations

Figure 4

is section describes the details on the storage systems, cross-subsystem paths, volumes and mapping

aths as shown in the above ﬁgure.

External Storage Components

Storage Systems and Cross-subsystem Paths

Before using External Storage, connect the Fibre Channel port of the local storage system to the external storage system port with the ﬁbre cable. The route between ports, which is connected with the cable, is called the cross-subsystem path.

The Fibre Channel port of the local storage system is set to connect to the host by default. The Fibre Channel port can be connected to an external storage system if you change the attribute of the Fibre Channel port so that it is an external port, which can be connected to an external storage system. The external storage system port can be a target port, which can be connected to a host.

To manipulate External Storage, you need to install External Storage by using the license key. Use your Remote Web Console computer to access the local storage system via SVP (web server) and perform the External Storage operations.

Volumes and Mapping Paths

Volumes in the external storage system (see C in Figure 4 on page 19) are called external volumes. Mapping is necessary to manipulate an external volume from the local storage system. The system administrator maps an external volume as an internal volume (see B in Figure 4 on page 19) in the local storage system. After the mapping, you can manipulate the external volume from the local storage system in the same way as manipulating an internal volume.

Note:

When external volumes in external storage systems are mapped as internal volumes in your storage systems, the external volumes can be accessed and copied by hosts connecting to your storage systems, but not by hosts connecting to the external storage systems.

XP24000 External Storage Software User’s Guide

This document sometimes uses the term external volume or mapped external volume to mention an internal volume where an external volume is mapped (see B in Figure 4 on page 19), because this internal volume is a virtual representation of an external volume.

When you perform mapping, a path is automatically created between an internal volume and an external volume. This path is called a mapping path, which connects one volume with another volume. A cross-subsystem path is a part of a mapping path.

To use the external volumes, which you mapped as an internal volume (see B in Figure 4 on page 19), from the host or other program products, the system administrator needs to create LDEVs in the external volume (see A in Figure 4 on page 19). To create LDEVs, use External Storage at the time of mapping, or use VLL function to an internal volume where an external volume is mapped after mapping. The LDEVs created by these methods are called LDEVs in the external volume in this document. These LDEVs are usually called external volumes in other documents.

An external volume corresponds to a VLL VDEV (Virtual Device). An LDEV in the external volume corresponds to a VLL LDEV. Therefore, you can use VLL function to create custom-sized volumes in an external volume after mapping, in the same way as creating custom-sized volumes in the normal internal volumes. For details on VDEVs and LDEVs, see the HP StorageWorks XP24000 Virtual LVI/LUN (VLL) and Volume Shredder User’s Guide.

External Storage Operations

External Storage enables you to execute the following operations.

• Preparing to use external volumes

You can map paths. For details, see “Conﬁguring External Storage” on page 20, and section “Overview of Setting Operations”onpage67.

• Preparing to manipulate the power supply of the storage systems

You must follow speciﬁc procedures if you want to manipulate the power supply of the storage systems when external volumes are used. To turn on or off the power supply of the external storage Externa

• Setting up and removing the cross-subsystem paths

When you set up or remove the path (cable) connecting the storage systems, you need to use Ex “Disconnecting External Storage System or Disconnecting External Volume” on page 89 and section “Checking Connection Status and Resuming External Volume Operation” on page 91. For details on setup, see “Conﬁguring Cross-subsystem Path” on page 81.

• Refer

You ca “ Checking the External Volume Details” on page 83.

• Stopping the use of external volumes

You can cancel mapping of external volumes. For details, see “Dele

• Setting the remote command device

By using the remote command device, you can manipulate volumes in the external storage system from the HP StorageWorks XP RAID Manager on host computers. For details, see “Rem

l Storage. For details, see “Turning On or Off the Storage System” on page 87.

ring to the status of external volumes

n see the status and the conﬁguration of external volumes. For details, see

ting the External Volume Mapping” on page 96.

ote Command Devices”onpage99.

external volumes, set port attributes, and set cross-subsystem

system after starting to use the external volumes, you need to execute the commands of

ternal Storage to make settings on the path. For details on removal, see

Conﬁguring External Storage

Before conﬁguring the External Storage settings, you need to answer the following:

• Which ports can be connected to external storage systems (see

“Choosing the External Port”on page21).

• Which external storage system and volumes should be mapped as the internal volumes (see

“Choosing and Mapping External Volumes” on page 21).

About External Storage Operations

• How to conﬁgure external volume groups (see

“Registering a Volume to an External Volume Group (ExG)”onpage21).

• What external volume attributes to be conﬁgured (see

“Conﬁguring External Volume Attributes”onpage22).

•

How to conﬁgure cross-subsystem paths (see “Cross-subsystem Paths”onpage23).

• How tomakevolumeusablefromthe localstorage system (see

“Connecting Mainframe Volumes” on page 29 and section “Connecting Open Systems Volumes”onpage30).

Each item above is explained in the following sections.

Choosing the External Port

The port used for External Storage must be set as the external port. When the external storage system is connected to the external port of the local storage system, you can view the information on the external storage system from the Remote Web Console computer. The external storage system cannot be connected

In order to set the port attribute to external, the LU paths set to the port must be released. The attribute of theport where theLUpaths arealready set cannotbechanged to external. Therefore,you must identify ports whose attributes can be changed to external before starting the External Storage operations.

Note:

or other features cannot be used as external ports for External Storage. In addition, change the port attribute to external if the port attribute is set to other than external.

For instr “Settin

to the ports other than the external port.

The ports whose attributes are set for remote copy software (for example, RCU target, initiator)

uctions on conﬁguring port attributes, see

g Port Attribute for Local Storage System”onpage68.

Choosing and Mapping External Volumes

When you connect an external storage system to an external port, volumes in the external storage system (external volumes) become available for mapping as volumes in the local storage system (internal volumes). Identify the volumes in each external storage system that should be mapped as internal volumes.

• You cannot access the data that is stored in an external volume beyond the maximum available

capacity. For example, if an external volume of 100 GB was mapped as an internal volume of 70 GB, then 30 GB of theexternalvolume would notbeaccessiblefrom the localstorage system side.

• You cannot map an external volume whose capacity is smaller than the minimum available

capacity. For example, you cannot map an external volume of 10 GB as an internal volume which requires at least 30 GB.

The maximum or minimum available capacity of an external volume depends on the emulation type that is set when the volume is mapped. See “Required Volume Capacity for Each Emulation Type” on page 127 for the capacity of the external volume for each emulation type. For the maximum number of external volumeswhich canbemapped, see“External Storage Requirements”onpage43.

stering a Volume to an External Volume Group (ExG)

Regi

When you map an external volume as an internal volume, you need to register the external volume to an external volume group.

External volumes, which are set by External Storage, can be classiﬁed into groups by usage. Any group of this type is called an external volume group (ExG). For instance, you can register multiple volumes

ne external storage system to one external volume group. Or you can register the volumes in one

in o external volume group and manage them in block, even though the data you want to manage in a lump is stored in volumes in the different external storage systems.

XP24000 External Storage Software User’s Guide

You need to assign numbers to external volume groups. See “External Storage Requirements” on page 43 for details on a maximum number of external volume groups, or a maximum number of volumes to be registered in one external volume group.

Conﬁguring Ex

When you map an volume. External volume attributes can be set using the mapping policy or the Set External Volume Parameter dialog box of the External Storage. For details on the mapping policy, see “Choosing Mapping Policy” on page 30. For details on the Set External Volume Parameter dialog box, see “Set Exte

The attribut

• Emulation type

Select an emulation type for the mapped external volume from the drop-down list. The emulatio existing dat migrate the existing data in the external volume to the local storage system volume, you have to set the OPEN-V emulation type when the external volume is mapped. If you selec for management data. Once this area is provided, volume capacity after the mapping becomes less than the actual external volume capacity for the area (volume). For details on volume capacity, see “Capacity Guidelines”onpage45.

• Cache Mode

Cache mode speciﬁes whether the write data from the host to the external storage system is propagated synchronously or asynchronously. All I/O to and from the local storage system (either Enable or Disable) always uses cache. Write operations are always backed up in duplex cache.

•If you sel the local asynchronously destages the data to the external storage system cache where it is then asynchronously destaged to disk.

•If you se complet external storage system cache. The external storage system cache then asynchronously destages this data to disk. If you perform the HP StorageWorks XP Cache Residency Manager operation on the external volume, which the Cache Mode is set to Disable, the bind mode of Cache Residency Manager cannot be speciﬁed. For the Cache Residency Manager operation, see the HP StorageWorks

XP240

• Inﬂow Control (Enable or Disable)

Inﬂow control speciﬁes whether the writing operation to the cache memory is stopped (Enable)or continued (Disable) when the writing operation to the external volume is impossible. By default, inﬂow control is set to Disable

•If yo accepted when the writing operation to the external volume is impossible.

•If you select Disable, the I/O from the host during the retry operation is written to the cache memory even after the writing operation to the external volume is impossible. Once the wri is written to the external volume (all the data is destaged).

• CLPR

n the cache memory is partitioned using HP StorageWorks XP Disk/Cache Partition,

Whe

ﬁgure a cache logical partition (CLPR) to access the mapped volume. Please see the HP

con

orageWorks XP24000 Disk/Cache Partition User’s Guide for the detailed information on CLPR.

ternal Volume Attributes

external volume as an internal volume, you set the attributes of the external

rnal Volume Parameter Dialog Box” on page 72.

es of the external volume are as follows:

ntype OPEN-V must be selected if, after the mapping, you are planning to use the

a in the external volume from the local storage system. For example, if you want to

t the emulation type other than OPEN-V,the volume requires aspeciﬁcareaprovided

(Enable or Disable)

ect Enable, after receiving the data into the local storage system cache memory,

storage system signals the host that an I/O operation has completed and then

lect Disable, the local storage system signals the host that an I/O operation has

ed only after the local storage system has synchronously written the data to the

00 Cache Residency Manager User’s Guide.

uselect Enable,the writingoperation to cacheisstoppedand theI/O from thehostisnot

ting operation to the external volume becomes normal, all the data in the cache memory

About External Storage Operations

Cross-subsyste

A cross-subsystem path is a route from a local storage system port to an external storage system port. To prepare for possible failures of the cable, the switch, or the channel processor, it is recommended that you create redu operations to the external volumes when you maintain the cable. You can set up to eight paths.

A group of redundant cross-subsystem paths is called a path group. In a path group, the cross-subsystem path that has the highest priority is called the primary path. The cross-subsystem paths other than priority path are calle

• Setting of the path groups

A path group is automatically set when you map the external volume. You cannot set a new path group by itself.

• Setting of cr

Use ﬁbre cabl storage syst of the local If multiple (that is, e show the po an external volume. In this dialog box, you can set cross-subsystem paths by selecting the starting points and the ending points of the paths according to the actual cable connections. For details on how to set cross-subsystem paths, see “Conﬁgure Cross-subsystem Paths Dialog Box”onpage78.

• Setting of redundant cross-subsystem paths

You can se cross-subsystem paths. You can also add an alternate path or change the priority after completing the mapping of the external volume (see “Setting the Cross-subsystem Paths” on page 78).

mPaths

ndant cross-subsystem paths. This redundancy allows you to continue performing the I/O

d alternate paths.

oss-subsystem paths

es to establish multiple paths between the external storage system and the local

em. At this time, connect to the external storage system from the different cluster port

storage system.

paths are established between the two storage systems, the starting points of the paths

xternal ports of the local storage system) and the ending points (that is, WWNs which

rts of the external storage system) will be displayed in a dialog box when you map

t redundant cross-subsystem paths (add alternate paths) when you set the

Path Mode

Path mode is either Single mode or Multi mode, depending on the connected external storage system.

• In the Single mode, only the path with the highest priority (primary path) is used to execute the

I/O to the external volume. When an error occurs in the primary path, the path with the second highest priority is used.

• In the Multi mode, all of the set paths are used at the same time. The multiple paths are used to

executethe I/Os to theexternalvolumethusdistributing the work load (round-robin processing).

For example, when a volume in the external storage system with the path mode of the Single mode is mapped as an internal volume using External Storage, the host I/O operations to the external volume are enabled using the primary path set in the mapping operation. The path is automatically switched to the alternate path when the primary path set in mapping operation cannot be used due to, for instance, maintenance operation in the storage system, or a failure in the channel processor. Because the path is switched to the alternate path, the I/O operation to the external volume continues even though an error occurred in the original path.

Note:

When the primary path cannot be used for three minutes continuously, the path is switched

to the alternate path.

Examples of Alternate Paths

Figure 5 on page 24 illustrates an example of setting an alternate path. In Figure 5 on page 24, external

rage system ports, WWN A and WWN B, are connected to CL1-A and CL2-A respectively, which are

sto

t to the external ports in the local storage system. You need to specify the port of a different cluster

the local storage system for the alternate path. Therefore, CL1 port and CL2 port are speciﬁed as

in shown in Figure 5 on page 24.

XP24000 External Storage Software User’s Guide

Figure 5 Example of Alternate Path Setting

Figure 6 on page 24 illustrates an example of setting an alternate path when a switch is used. In Figure 6 on page 24, two ports are speciﬁed in the local storage system, and connected to the ports in

the external storage system through the switch. In this case, two ports of different clusters are speciﬁed in the local storage system. Therefore, the setting of the alternate path is enabled.

Figure 6 Example of Available Alternate Path Setting

In Figure 7 on page 25, two paths are also set between the internal volume and the external volume. However, one port is speciﬁed in the local storage system, and two ports are speciﬁed in the external storage systems over the switch. This conﬁguration is not recommended because two ports of different clusters need to be set in the local storage system for alternate path settings in External Storage.

About External Storage Operations

Figure 7 Example of Unavailable Alternate Path Setting

Examples of Switching I/O Execution Paths to Alternate Paths

This section describes the case examples of the performance when the I/O execution path is switched to the alternate path for each path mode as follows:

• When the path mode is Multi mode.

• When thepathmodeis Singlemode.

• When the path mode is Single mode and there is at least one alternate path in the Standby status.

For the description about the path status, see “Mapping Path Information Dialog Box” on page 84.

• When the path mode is Multi mode

Figure 8 on page 26 shows an example of the case when the path mode is Multi mode. When

an error occurs in one path, I/Os are executed using the paths other than the error path.

Note:

As you restore the error path, the use of the restored path is automatically resumed.

XP24000 External Storage Software User’s Guide

Figure 8 When the Path Mode is Multi Mode

• When t

Figur

an err

he path mode is Single mode

e 9 on page 27 shows an example of the case when the path mode is Single mode. When

or occurs in the path that is being used for I/Os, the I/O execution path is switched to the

path with the second highest priority.

Note:

As you restore the path with the priority higher than the currently used path, the I/O

execution path is automatically switched to the restored path that has the highest priority.

About External Storage Operations

Figure 9 When the Path Mode is Single Mode

• When t

Figur

he path mode is Single mode and there is at least one alternate path in the Standby status

e10 on page 28 shows an example of the case when the path mode is Single mode, and

there are the alternate paths in the Normal status and the Standby status. Figure 11 on page 29 shows another example of the case when the path mode is Single mode. In the case of

Figure 11 on page 29, there are alternate paths in the Standby status only.

When an error occurs in the path that is being used for I/Os, the I/O execution path is switched to the path with the second highest priority in the Normal status (see Figure 10 on page 28). If there is no path in the Normal status other than the path that is being used for I/Os, the status of the path in the Standby status is automatically changed to Normal, and the I/O execution path is

tched to that path (see Figure 11 on page 29).

swi

Note:

Only when the external storage system is EVA storage system, as you restore the path with the highest priority, the I/O execution path is switched back to the restored highest priority path. In this case, the status of the path for which the status has been changed to Normal when the error has occurred is changed back to Standby.

XP24000 External Storage Software User’s Guide

Figure 10 Single Mode with Alternate Paths in Normal and Standby

About External Storage Operations

Figure 11 Single Mode with Alternate Paths in Standby only

Connecting Mainframe Volumes

Mainframe volumes, that pre-exist on an external storage system and are accessed by ESCON or FICON channels, cannot connect directly to the storage system as an external volume. The storage system does not recognize these volumes because of the Fibre Channel.

To use external volumes as mainframe volumes, there are two ways:

• Zero-format external volumes on the external storage system side, map the external volumes to the

internal volumes using External Storage on the local storage system side, and then perform the Write to Control Blocks operation using the VLL function on the local storage system side.

• Map the external volumes to the internal volumes using External Storage on the local storage

system side, and then format the mapped external volumes using the VLL function on the local storage system side.

If you set the emulation type for the mainframe system (such as 3380 or 3390, shown in “Required Volume Capacity for Each Emulation Type” on page 127) as you map the external volume, the status of the mapped volume becomes Blockade after the mapping operation. After the system administrator performs the Write to Control Blocks operation or formats the mapped external volumes using VLL function on the local storage system side, the mainframe host can then access the new mainframe volume through the local storage system’s ESCON or FICON channels.

XP24000 External Storage Software User’s Guide

Note:

If you format the mapped volume of the external storage system from the external storage system side, the existing data before formatting cannot be assured. When you use the mapped external volume from the mainframe OS, format the mapped volume from the local storage system side.

For the procedure of the volume formatting operation and the Write to Control Blocks operation, see the HP StorageWorks XP24000 Virtual LVI/LUN (VLL) and Volume Shredder User’s Guide.

Connecting Open Systems Volumes

Open systems as open syst connection to initiali of the volu Volume Shredder User’s Guide.

OPEN-V emulation is recommended because, in most cases, OPEN-V emulation provides the most efﬁcient u retain ex

volumes in external storage system connect to and are recognized by the storage system

ems volumes, without requiring reformatting. Reformatting is not required because the

between the storage system and the external storage system is Fibre Channel. If you need

ze the data area for the volume, format the volume using the VLL function. For the procedure

me formatting operation, see the HP StorageWorks XP24000 Virtual LVI/LUN (VLL) and

se of storage and the best performance. Also, emulation types other than OPEN-V may not

isting data after being mapped.

Choosing Mapping Policy

Policy is a list of settings of the necessary information for mapping the external volume. By setting the mapping policy in advance, the setting at the time of mapping will be easier.

Two policies are prepared in advance. The user can change the default value of the policy. For details on the default value, see “Edit Policy Dialog Box” on page 95.

Difference between Automatic Mapping and Manual Mapping

When you map the external volume, you need to conﬁgure:

• cross-subsystem paths

• extern

• LDEV number to LDEVs in the external volume

• SSID

When yo settings above are automatically made by External Storage according to the mapping policy. When you perform manual mapping, users conﬁgure all the settings.

al volume parameters

u perform automatic mapping, users conﬁgure only cross-subsystem paths and all the other

Automatic mapping maps all the external volume found by the Volume Discovery to the internal volumes. Automatic mapping requires less settings but you are not allowed to set different parameters to each external volumes or to specify LDEV number to each LDEVs. You can set the parameters such as emulation type to mapping policy in advance.

For the procedure of automatic mapping, see “Mapping an External Volume Automatically” on page 69. For the procedure of manual mapping, see “Mapping an External Volume Manually” on page 69.

Port Discovery and Volume Discovery

Port Discovery and Volume Discovery are the methods used to ﬁnd external volumes, and will be executed when you map external volumes or when you add cross-subsystem paths.

Port Discovery is a process to search for and get information about target ports of the connected external storage system from an external port of the local storage system. The latest information about the external storage system can be displayed in a dialog box of External Storage when you execute Port Discovery.

You can set in advance the mapping policy on whether to execute the Port Discovery automatically or manually. If Port Discovery is executed automatically, WWNs connected to all the external ports of the local storage system will be searched for. If Port Discovery is executed manually, you can select a speciﬁc

About External Storage Operations

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HP XP External Storage Software User Manual

About this Guide

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1 Overview of HP StorageWorks XP External Storage Software

Unifying Connections from a Host to Different Storage Systems

2 About External Storage Operations

External Storage Components

External Storage Operations

Conﬁguring External Storage

Choosing Mapping Policy