Mirrorset Switches | Compaq HSZ80 manual

3–45

Mirrorset Switches

You can enable the following switches to control how a mirrorset behaves to ensure data availability:

■Replacement policy

■Copy speed

■Read source

■Disaster Tolerance Support

Replacement Policy

Specify a replacement policy to determine how the controller replaces a failed disk drive:

NOTE: If DT_SUPPORT is enabled, no policy can be selected.

■POLICY=BEST_PERFORMANCE (default) puts the failed disk drive in the failedset, then tries to find a replacement (from the spareset) that is on a different device port than the remaining operational disk drives. If more than one disk drive meets this criterion, this switch selects a drive that also provides the best fit. This switch is not valid if DT_SUPPORT is enabled.

■POLICY=BEST_FIT puts the failed disk drive in the failedset, then tries to find a replacement (from the spareset) that equals or exceeds the base member size (smallest disk drive at the time the mirrorset was initialized). If more than one disk drive meets this criterion, this switch selects one that also provides the best performance. This switch is not valid if DT_SUPPORT is enabled.

■NOPOLICY puts the failed disk drive in the failedset and does not replace it. The storageset operates with less than the nominal number of members until you specify a replacement policy or manually replace the failed disk drive.

Compaq HSZ80 Array Controller ACS Version 8.3 Configuration and CLI Reference Guide

Image 135

Compaq HSZ80 manual Mirrorset Switches

Contents

HSZ80 Array Controller ACS Version Page Japan USA Page Chapter Creating Storagesets Vii CLI Commands Viii Appendix a Page Figures Xii Xiii Tables Xiv Compaq Website Telephone Numbers Getting Help Xvi About This Guide PrecautionsElectrostatic Discharge Precautions Component Precaution Vhdci Cable Precautions Maintenance Port PrecautionsXvii Conventions Typographical ConventionsXviii About This Guide Xix Special Notices Xx About This Guide Required Tools Xxi Related Publications Xxii About This Guide Revision History General Description 2General Description Typical Installation Basic Building Block 4General Description Basic Building Blocks List Summary of Controller Features Summary of HSZ80 Features 6General Description Bridging the Gap Between the Host and Its Storage Subsystem HSZ80 Array Controller 8General Description HSZ80 Array Controller HSZ80 Array Controller 10General Description Description of Parts Description of Parts 12General Description Parts of the Optional Maintenance Port Cable EMU PVA Operator Control Panel 14General Description Maintenance Port Fault Management Utility Utilities and ExercisersVirtual Terminal Display Clone Utility Configuration UtilityDisk Inline Exerciser Code Load and Code Patch Utility Field Replacement Utility Change Volume Serial Number UtilityDevice Statistics Utility Cache Module Memory Configurations Cache Module18General Description Location of Cache Module Parts 20General Description Caching TechniquesRead Caching Read-Ahead Caching Write-Back Caching Write-Through Caching 22General Description Fault-Tolerance for Write-Back CachingNonvolatile Memory Cache Policies Resulting from Cache Module Failures Cache Policies and Cache Module Status Failover to controller B 24General Description Resulting Cache Policies and ECB Status 26General Description Through caching to its units Less than 28General Description 10 ECB Capacity Based on Memory Size External Cache Battery 30General Description 11 Location of Parts Battery Hysteresis Charging DiagnosticsPage Configuring an HSZ80 Array Controller Configuration Rules 2Configuring an HSZ80 Array ControllerIntroduction Few Tips Configuring an HSZ80 Array Controller 4Configuring an HSZ80 Array Controller Location of Parts for a Single Controller Configuration Configuring a Single Controller 6Configuring an HSZ80 Array Controller SET Thiscontroller HOSTFUNCTION= ID, Mode 8Configuring an HSZ80 Array Controller Connecting a Single Controller to the Host 10Configuring an HSZ80 Array Controller Location of Parts for Transparent Failover SET Failover Copy = Thiscontroller 12Configuring an HSZ80 Array Controller Restart Othercontroller Restart Thiscontroller 14Configuring an HSZ80 Array Controller Connecting in Transparent Failover Mode to the Host 16Configuring an HSZ80 Array Controller Location of Parts for Multiple-Bus Failover SET Multibusfailover Copy = Thiscontroller 18Configuring an HSZ80 Array Controller Restart Othercontroller Restart Thiscontroller 20Configuring an HSZ80 Array Controller Connecting in Multiple-Bus Failover Mode to the Host 22Configuring an HSZ80 Array Controller Optional StepsChange the CLI prompt Set the maximum data-transfer rate UPS Support 24Configuring an HSZ80 Array Controller Setting the PVA Module ID Switch Establishing a Local Connection to Controller 26Configuring an HSZ80 Array Controller PC/Terminal to Maintenance Port Connection This Controller and Other Controller 28Configuring an HSZ80 Array Controller Using Transparent Failover Mode Selecting a Failover Mode 30Configuring an HSZ80 Array Controller Using Multiple-Bus Failover Mode Enabling Mirrored Write-Back Cache Selecting a Cache Mode 32Configuring an HSZ80 Array Controller Fault-Tolerance Host Scsi Bus Setting Scsi Target ID Numbers Device Scsi Bus 34Configuring an HSZ80 Array Controller Using Preferred ID Numbers Page Creating Storagesets 2Creating Storagesets Disk drives 4Creating Storagesets Planning and Configuring Storagesets Creating a Storageset and Device Profile Type of Storageset Creating Storagesets Determining Storage Requirements For Disk Array Technology Choosing a Storageset TypeA Comparison of Different Kinds of Storagesets 8Creating Storagesets Using Stripesets to Increase I/O Performance 10Creating Storagesets Considerations for Planning a Stripeset Distribute Members across Ports 12Creating Storagesets Using Mirrorsets to Ensure Availability Mirrorsets Maintain Two Copies of the Same Data Considerations for Planning a Mirrorset First Mirrorset Members on Different Buses 14Creating Storagesets Using RAIDsets to Increase Performance Availability 16Creating Storagesets Considerations for Planning a RAIDsetPage Striping and Mirroring in the Same Storageset 18Creating Storagesets Considerations for Planning a Striped Mirrorset 20Creating Storagesets Cloning Data for Backup Clone Steps for Duplicating Unit Members 22Creating Storagesets Example Use available device DISK20400size=832317 for member DISK20000size=832317 y,n y ? y 24Creating Storagesets Saving Subsystem Configuration Information to a Single Disk Backing Up Your Subsystem Configuration 26Creating Storagesets Saving Subsystem Configuration Information to a Storageset Controller Displaying the Status of the Save Configuration Feature Cache 28Creating Storagesets Notransportable Node IDs Restoring Node IDs30Creating Storagesets Page 32Creating Storagesets Assigning Unit Numbers for Host Access to Storagesets LUN Unit Numbering Examples 34Creating Storagesets Creating a Storageset Map 10. Storageset Map Device PTL Addressing Convention within Controller 36Creating StoragesetsLocate devicename 11. PTL Naming Convention Device port numbers Target Numbers 38Creating Storagesets 13. Locating Devices using PTLs Planning Partitions Defining a Partition40Creating Storagesets Guidelines for Partitioning Storagesets Disk Drives 42Creating Storagesets Choosing Switches for Storagesets DevicesEnabling Switches Changing Switches RAIDset Switches Replacement PolicyReconstruction Policy 44Creating Storagesets Membership Mirrorset Switches Copy Speed Read Source46Creating Storagesets Disaster Tolerance Support Device Switches Transportability48Creating Storagesets Device Transfer Rate Local/Remote 50Creating StoragesetsDtsupport Chunk Size Initialize Switches 52Creating Storagesets Increasing the Request Rate 16. Chunk Size Smaller than the Request Size Increasing the Data Transfer Rate 54Creating Storagesets Increasing Sequential Write PerformanceMaximum Chunk Size for RAIDsets Maximum Chunk Sizes for a RAIDset Considerations for Saving the Configuration Save Configuration 56Creating Storagesets Destroy/Nodestroy Unit Switches Unit Switches for Storagesets58Creating Storagesets Configuring Storagesets Adding One Disk Drive at a Time 2Configuring StoragesetsADD Disk DISKnnnn ptl-location switchvalue Adding Disk Drives Configuring a Stripeset Initialize mirrorset-name switch Configuring a Mirrorset4Configuring Storagesets ADD Mirrorset mirrorset-name DISKnnnn DISKnnnn switch Show mirrorset-name ADD Unit unit-number mirrorset-name switch Initialize RAIDset-name switch Configuring a RAIDset6Configuring Storagesets ADD Raidset RAIDset-name DISKnnnn DISKnnnn DISKnnnn switch Configuring a Striped Mirrorset Show RAIDset-nameADD Stripeset stripeset-name mirrorset1 mirrorset2 8Configuring Storagesets ADD Unit unit-number DISKnnnn switchvalue Configuring a Single-Disk Unit Partitioning a Storageset or Disk Drive 10Configuring Storagesets Show storageset-name Initialize storageset-name switch 12Configuring Storagesets Adding a Disk Drive to the Spareset 14Configuring Storagesets Removing a Disk Drive from the Spareset Enabling Autospare Delete storageset-name 16Configuring StoragesetsDeleting a Storageset Delete unit-number Changing Device Switches Changing Switches for a Storageset or DeviceDisplaying the Current Switches Changing RAIDset and Mirrorset Switches Changing Initialize Switches Changing Unit Switches18Configuring Storagesets Enabling and Disabling the CCL Configuring with the Command Console LUN Finding the CCL Location SCSI-2 ModeSCSI-3 Mode 20Configuring Storagesets Adding Storage Units with the CCL Troubleshooting with the CCL 22Configuring Storagesets Host Modes Configuring Units with Multiple Hosts IBM AIX 24Configuring Storagesets Setting Host Modes Transparent Failover Mode 26Configuring StoragesetsDesignating the Port Accessing Units on a Given Port Designating the Host Scsi ID Number 28Configuring Storagesets Scsi ID Designating the Port and Designating the Host Scsi ID Number 30Configuring Storagesets SET this PORT1ID = SET this PORT2ID = 32Configuring Storagesets Multiple-Bus Failover Mode Assigning Units through Multiple Host Adapters 34Configuring Storagesets Moving a Storageset from one Subsystem to Another Moving Storagesets ADD Disk disk-name PTL-location 36Configuring StoragesetsLocate disk-name Delete disk-name ADD Unit unit-number storageset-name ADD storageset-name disk-name disk-name Move disk drives to their new location 38Configuring Storagesets CLI Commands CLI Overview Using the CLICommand Overview 2CLI Commands Entering CLI Commands Getting HelpSET Thiscontroller ? Recall and Edit Command Keys 4CLI CommandsUnit Naming Unit Number Changing the CLI Prompt Command Syntax6CLI Commands Command parameter Switches ADD Disk SyntaxParameters Remote Switches8CLI Commands Transportable ADD Disk DISK40200 4 2 0 Transportable TRANSFERRATEREQUESTED=20MHZ DefaultTRANSFERRATEREQUESTED=ASYNCHRONOUS TRANSFERRATEREQUESTED=10MHZ TRANSFERRATEREQUESTED=5MHZ ADD Disk DISK200 2 0 0 Remote 10CLI CommandsSee also Initialize DISK20000 2 0 ADD Unit D199 DISK20000 COPY=FAST ADD Mirrorset POLICY=BESTFIT 12CLI CommandsPOLICY=BESTPERFORMANCE Default Dtsupport Nodtsupport READSOURCE=ROUNDROBIN READSOURCE=disk-name READSOURCE=LEASTBUSY Default 14CLI Commands ADD Mirrorset MIRR1 DISK10000 DISK20100 DISK30200Initialize MIRR1 ADD Unit D104 MIRR1 ADD Disk ADD Unit Initialize Mirror ReduceShow Mirrorsets Show Storagesets Unmirror ADD Passthrough passthrough-name scsi-port-target-lun 16CLI CommandsADD Passthrough Parameter ADD Passthrough TAPE20300 2 3 ADD Unit P100 TAPE20300 18CLI Commands Show Devices Show PassthroughShow passthrough-name RAIDset-name ADD Raidset 20CLI Commands RECONSTRUCT=NORMAL DefaultRECONSTRUCT=FAST Initialize RAID8 Noreduced DefaultReduced ADD Raidset RAID9 DISK10000 DISK20100 DISK30200 SET Raidset Show Raidset 22CLI CommandsADD Unit D70 RAID8 ADD Raidset RAID6 DISK10300 DISK20400 DISK30200 Reduced Disk-name ADD SparesetADD Spareset DISK20200 ADD Spareset DISK30300 Delete Spareset Show Spareset Show Storagesets Container-name1 container-name2 container-nameN 24CLI CommandsADD Stripeset Stripeset-name Initialize STRIPE1 ADD Unit D103 STRIPE1 ADD Stripeset STRIPE1 DISK10000 DISK20100 DISK30200 26CLI Commands ADD Unit ADD MirrorsetInitialize Show Storageset Show Stripeset ADD Unit ADD Unit unit-number container-nameUnit-number 28CLI Commands ADD Unit Switches for StoragesetsPage PARTITION=partitionnumber 30CLI CommandsMAXIMUMCACHEDTRANSFER=32 Default MAXIMUMCACHEDTRANSFER=n Nopreferredpath Default Noreadaheadcache Readcache DefaultReadaheadcache Default Noreadcache Nowritebackcache 32CLI CommandsNorun Nowriteprotect ADD Unit D102 DISK10000 PREFERREDPATH=THISCONTROLLER Show Units 34CLI CommandsCreatepartition Delete unit-number SET unit-number Clearerrors Clearerrors Clearerrors Clearerrors Clearerrors CLIClearerrors CLI Clearerrors CLI Clearerrors controller Invalidcache 36CLI CommandsController Examples Device-name Clearerrors device-nameUNKNOWN38CLI Commands Clearerrors DISK30000 Unknown See also Clearerrors unit-numberLOSTDATA 40CLI CommandsClearerrors D103 Lostdata See also Unwriteabledata Clearerrors unit-number42CLI Commands Clearerrors D103 Unwriteabledata See also Configuration Restore Configuration Save Initialize Configuration Reset44CLI Commands Configuration Reset Configuration Restore Configuration Restore Configuration Reset Configuration Save Initialize 46CLI Commands Configuration Reset Configuration Restore Initialize Configuration Save SIZE=percent 48CLI CommandsCreatepartition Createpartition container-name SIZE=percent CAPACITY= CYLINDERS= HEADS= SECTORSPERTRACK= Destroy Partition Show 50CLI Commands Delete STRIPE1 Delete DISK10000 52CLI Commands Delete Failedset Delete Spareset UnmirrorDelete RAID9 Delete Failedset Delete Failedset DISK20200SET Failedset Show Failedset ADD Spareset Show Spareset Delete Spareset54CLI Commands Delete Spareset DISK20300 Delete D103 Delete unit-number 56CLI Commands ADD Unit Clearerrors LostdataDelete Failedsets Delete Sparesets Destroypartition Destroypartition Destroypartition container-name PARTITION=partition-numberPartition-number Delete D102 Destroypartition RAID9 PARTITION=2 58CLI Commands Directory DirectoryRUN Help 60CLI CommandsHelp Help Your options are SET ? 62CLI Commands InitializeInitialize container-name CHUNKSIZE=DEFAULT Default CHUNKSIZE=n Nosaveconfiguration Default 64CLI CommandsDestroy Default Saveconfiguration Show Devices Full Initialize DISK10000 Saveconfiguration Reduce DISK40400 Initialize DISK40400 Nodestroy 66CLI Commands ALL CancelLocate Locate parameter Units 68CLI CommandsDisks PTL SCSI-location Locate DISK10000 Locate Cancel Locate D102Locate Disks 70CLI Commands MirrorMirror disk-name mirrorset-name POLICY=BESTFIT POLICY=BESTPERFORMANCE Nopolicy Default 72CLI Commands ADD Mirrorset Reduce Show Mirrorsets Unmirror Overridebadflush Poweroff74CLI Commands Battery on SECONDS=nn Poweroff Switch Settings Poweroff SECONDS=10 76CLI Commands Reduce 78CLI Commands Reduce disk-name1 disk-name2 disk-name3Disk-name1 disk-name2 disk-name3 Show Mirrorsets Show STRIPE1 80CLI Commands ADD Mirrorset RUN Clone Show MirrorsetSET mirrorset-name New-container-name RenameRename old-container-name new-container-name Old-container-name Rename DISK10000 Mydisk Show Disks 82CLI Commands Ignoreerrors Noignoreerrors DefaultRestart controller Restart Othercontroller 84CLI CommandsImmediateshutdown Restart Thiscontroller Retryerrors D103 Unwriteabledata Retryerrors unit-number Program-name 86CLI CommandsRUN RUN program-namePage RUN Dilx 88CLI Commands Selftest controller Selftest controller Restart controller Shutdown controller 90CLI CommandsSelftest Othercontroller Ignoreerrors Selftest Thiscontroller SET controller Switches SET controllerThiscontroller 92CLI Commands Cacheups CACHEFLUSHTIMER=n CACHEFLUSHTIMER=10 DefaultNocacheups Default Allocationclass HOSTFUNCTION=mode HOSTFUNCTION=ID,mode 94CLI CommandsCommandconsolelun Nocommandconsolelun Default NODEID=nnnn-nnnn-nnnn-nnnn checksum Mirroredcache 96CLI CommandsNOPORT1ID NOPORT2IDPage 98CLI Commands NOPORT1PREFERREDIDNOPORT2PREFERREDID TERMINALPARITY=ODD TERMINALPARITY=EVEN SCSIVERSION=SCSI-2 DefaultTERMINALSPEED=baudrate TERMINALSPEED=9600 Default SCSIVERSION=SCSI-3 Maximum SCSI-Bus Lengths for Given Data Transfer Rate 100CLI Commands Show Thiscontroller Show Othercontroller 101SET Othercontroller PROMPT=CONTROLLER B SET Thiscontroller PORT1ID=2,5 SET device-name 102CLI Commands 103 SET DISK10300 Remote 104CLI CommandsSET DISK20000 TRANSFERRATEREQUESTED=5MHZ SET DISK10300 Transportable SET EMU 105SET EMU FANSPEED=HIGH EMU Set Point Temperatures106CLI Commands FANSPEED=AUTOMATIC Default 107 SET EMU SENSOR2SETPOINT=34SET EMU FANSPEED=HIGH Autospare Noautospare 108CLI CommandsSET Failedset SET Failedset SET Failedset Autospare 109SET DISK10000 Transportable Init DISK10000 110CLI Commands SET FailoverThiscontroller Othercontroller 111 SET Failover COPY=THISCONTROLLERSET Multibusfailover SET Nofailover SET Nomultibusfailover SET mirrorset-name 112CLI Commands MEMBERSHIP=number-of-members 113 114CLI Commands REMOVE=disk-nameREPLACE=disk-name 115 SET MIRR1 POLICY=BESTFIT 116CLI Commands ADD Mirrorset Reduce Show Mirrorset Unmirror 117SET MIRR1 REMOVE=DISK30000 SET MIRR1 REPLACE=DISK30200 SET Multibusfailover 118CLI Commands SET Failover SET Nofailover SET Nomultibusfailover 119 Destroyunflushabledata 120CLI CommandsNodestroyunflushabledata Default SET Nofailover 121 SET NofailoverSET Failover SET Multibusfailover SET Nomultibusfailover SET Nomultibusfailover 122CLI Commands 123 SET Nomultibusfailover DestroyunflushabledataSET Failover SET Multibusfailover SET Nofailover SET RAIDset-name 124CLI Commands 125 126CLI Commands SET RAID9 POLICY=BESTFITSET RAID9 REMOVE=DISK10000 127 SET RAID9 REPLACE=DISK20100ADD Raidset Show Raidsets SET unit-number 128CLI Commands 129 130CLI Commands 131 MAXIMUMCACHEDTRANSFER=n MAXIMUMCACHEDTRANSFER=32 Default ERRORMODE=NORMAL ERRORMODE=FAILSAFE 132CLI Commands 133 134CLI Commands SET D102 Writeprotect Noreadcache 135 Show EMU 136CLI CommandsShow Show controller Show device-name Show device-type Storageset-name 137Device-type EMU Full 138CLI Commands 139 140CLI Commands Show MIRR1Show Mirrorset Full Show Thiscontroller Full 141 Show EMU 142CLI Commands 143 Shutdown controller 144CLI Commands Shutdown ThiscontrollerRestart controller Selftest controller Unmirror 145Unmirror DISK10300 ADD Mirrorset Reduce RUN Clone 146CLI Commands System Profiles 2System Profiles Device Profile Reduced Membership Storageset Profile 4System Profiles Enclosure Template Controller Specifications 2Controller Specifications Physical and Electrical Specifications for Controller Optimum Operating Environmental Specifications Environmental Specifications Table B-3 Maximum Operating Environmental Specifications Table B-4 Maximum Nonoperating Environmental Specifications4Controller Specifications Glossary Bit GL-2Glossary CSR Data striping GL-4Glossary See ECB Dual-simplex FD Scsi GL-6Glossary IBR Operation GL-8Glossary Mist Normal member GL-10Glossary PCM PTL GL-12Glossary RAIDset RFI GL-14Glossary SCSI-P cable Storage subsystem GL-16Glossary Synchronous GL-17 Vhdci GL-18Glossary GL-19 Page ADD Unit unit-number container-name,5-27Adding ADD Passthrough passthrough-name scsi-port-target-lun,5-16ADD Raidset RAIDset-name container- nameN ADD Stripeset stripeset-name container- nameN Batteryoff Poweroff Batteryon Poweroff 2IndexAUTOSPARE, 4-15SET Failedset Lostdata CacheupsCapacity CREATEPARTITION, 5-49INITIALIZE Chunksize Initialize SET MULTIBUSFAILOVER, 5-118SET Nofailover 4IndexPage 6Index CopyCylinders CREATEPARTITION, 5-49INITIALIZE Destroyunflushabledata SET Nofailover SET Nomultibusfailover Disks Disableaccesspath ADD Unit8Index Dilx Enableaccesspath ADD Unit ErrormodeECB Index Nosaveconfiguration SaveconfigurationADD Disk SET mirrorset-name,5-113Membership PTL SCSI-location,5-68unit-number,5-68UNITSMaximumcachedtransfer ADD Unit Membership Nopolicy ADD RAIDSET, 5-20NOPORT1ID Nooverridebadflush Poweroff Noautospare SET FailedsetNodeid INVALIDCACHE, 5-36NODTSUPPORT Noreadcache Overridebadflush PoweroffNOPORT2TRANSFERRATEREQUEST ED Nopreferredpath Show device-type,5-137Path PORT1IDPORT2ID Preferredpath PromptSET controller, 5-98Protocol SET mirrorset-name,5-116 SET mirrorset-name,5-114SET RAIDset-name,5-125 Rename old-container-name new-container RUN program name PORT1PREFERREDID PORT1TRANSFERRATEREQUESTE D PORT2PREFERREDID PORT2TRANSFERRATEREQUESTE DWRITEPROTECT, 5-133WRITEBACKCACHE Show storageset-name,5-137SHOW storageset-type,5-137 Passthrough Size Createpartition TRANSFERRATEREQUESTED, 3-49TRANSPORTABLE Time SET controller, 5-99Tip, defined, xix Tools, xx TopologyTRANSFERRATEREQUESTED, 3-49ADD Disk Vtdpy Writeprotect