Caché High Availability Guide - InterSystems Documentation

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6.1 Overview of Clusters ............................................................................................ 1086.1.1 Cluster Master ............................................................................................ 1096.1.2 Cluster Master as Lock Server ................................................................... 1096.2 Configuring a Caché Cluster ................................................................................ 1106.3 Managing Cluster Databases ................................................................................ 1116.3.1 Creating Caché Database Files ................................................................... 1116.3.2 Mounting Databases ................................................................................... 1116.3.3 Deleting a Cluster-Mounted Database ........................................................ 1126.4 Caché Startup ....................................................................................................... 1126.5 Write Image Journaling and Clusters ................................................................... 1136.6 Cluster Backup ..................................................................................................... 1136.7 System Design Issues for Clusters ....................................................................... 1146.7.1 Determining Database File Availability ..................................................... 1156.8 Cluster Application Development Strategies ....................................................... 1156.8.1 Block Level Contention .............................................................................. 1156.9 Caché ObjectScript Language Features ............................................................... 1166.9.1 Remote Caché ObjectScript Locks ............................................................. 1166.10 DCP and UDP Networking ................................................................................ 1187 Cluster Journaling ....................................................................................................... 1197.1 Journaling on Clusters .......................................................................................... 1197.1.1 Cluster Journal Log .................................................................................... 1207.1.2 Cluster Journal Sequence Numbers ............................................................ 1217.2 Cluster Failover .................................................................................................... 1227.2.1 Cluster Recovery ........................................................................................ 1237.2.2 Cluster Restore ........................................................................................... 1247.2.3 Failover Error Conditions ........................................................................... 1257.3 Cluster Shadowing ............................................................................................... 1267.3.1 Configuring a Cluster Shadow ................................................................... 1287.3.2 Cluster Shadowing Limitations .................................................................. 1317.4 Tools and Utilities ................................................................................................ 1327.5 Cluster Journal Restore ........................................................................................ 1327.5.1 Perform a Cluster Journal Restore .............................................................. 1337.5.2 Generate a Common Journal File ............................................................... 1437.5.3 Perform a Cluster Journal Restore after a Backup Restore ........................ 1437.5.4 Perform a Cluster Journal Restore Based on Caché Backups .................... 1447.6 Journal Dump Utility ........................................................................................... 144viCaché High Availability Guide
7.7 Startup Recovery Routine .................................................................................... 1457.8 Setting Journal Markers on a Clustered System .................................................. 1477.9 Cluster Journal Information Global ..................................................................... 1477.10 Shadow Information Global and Utilities .......................................................... 1508 Caché Clusters on Tru64 UNIX .................................................................................. 1558.1 Tru64 UNIX Caché Cluster Overview ................................................................. 1568.2 TruCluster File System Architecture .................................................................... 1578.2.1 Caché and CDSLs ...................................................................................... 1588.2.2 Remastering AdvFS Domains .................................................................... 1588.3 Planning a Tru64 Caché Cluster Installation ....................................................... 1608.4 Tuning a Tru64 Caché Cluster Member ............................................................... 1619 Caché and Windows Clusters ..................................................................................... 1639.1 Single Failover Cluster ......................................................................................... 1649.1.1 Setting Up a Failover Cluster ..................................................................... 1659.2 Example Procedures ............................................................................................. 1679.2.1 Create a Cluster Group ............................................................................... 1679.2.2 Create an IP Address Resource .................................................................. 1689.2.3 Create a Physical Disk Resource ................................................................ 1709.2.4 Install Caché ............................................................................................... 1709.2.5 Create a Caché Cluster Resource ............................................................... 1719.3 Multiple Failover Cluster ..................................................................................... 1749.3.1 Setting Up a Multiple Failover Cluster ....................................................... 17510 ECP Failover .............................................................................................................. 17910.1 ECP Recovery .................................................................................................... 17910.2 ECP and Clusters ............................................................................................... 18110.2.1 Application Server Fails ........................................................................... 18210.2.2 Data Server Fails ...................................................................................... 18210.2.3 Network Is Interrupted ............................................................................. 18310.2.4 Cluster as an ECP Database Server .......................................................... 183Caché High Availability Guidevii
Page 3 and 4: Table of ContentsIntroduction .....
Page 5: 3.3.5 Purge Journal Files .........
Page 9: List of TablesConditions Affecting
Page 13 and 14: 1Write Image Journaling andRecovery
Page 15 and 16: RecoveryDue to the sequential natur
Page 17 and 18: Error Conditions1.2.1.3 Completes R
Page 19 and 20: Error Conditions1.3.2 Sample Recove
Page 21 and 22: Error Conditionsand then:ccontrol s
Page 23 and 24: Limitations of Write Image Journali
Page 25 and 26: 2Backup and RestoreThis chapter out
Page 27 and 28: Importance of JournalsDepending on
Page 29 and 30: unwieldy. The approach is to freeze
Page 31 and 32: 1. Quiesce (pause) the database (th
Page 33 and 34: • Advantages — Quicker than a f
Page 35 and 36: These are predefined backup tasks t
Page 37 and 38: Managing Caché Online BackupsYou c
Page 39 and 40: Managing Caché Online Backups2.5.4
Page 41 and 42: Restoring from a BackupCaché helps
Page 43 and 44: Restoring from a Backup1.USER>DO ^%
Page 45 and 46: 8. Specify the input file for the n
Page 47 and 48: Restoring from a Backup3) Restore S
Page 49 and 50: once the backup has been started. Y
Page 51 and 52: Caché Backup UtilitiesValues of ba
Page 53 and 54: UNIX Backup and RestoreUNIX Backup
Page 55 and 56: 2.9 OpenVMS Backup and RestoreThe f
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This privilege is required because
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processing. You back up the mirror
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JournalingWhen Caché starts, it re
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Journaling• Commit the transactio
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Journalingupgrade from a previous r
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Journaling3.3 Journaling Operation
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JournalingYou can also use the ^JRN
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JournalingEnter the appropriate men
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Journaling• Enter Yes at the prom
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Journaling6. The canonical form of
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JournalingJournal: c:\cachesys\mgr\
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JournalingFieldRemote system IDTime
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Journaling%SYS>Do SELECT^JRNDUMP("J
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JournalingIf the errors are from tr
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Journalingrecovered. This operation
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Journaling%SYS>d ^JCONVERTJournal C
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JournalingJournaling TaskDelete a r
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JournalingFreeze System on Journal
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4Shadow JournalingShadow journaling
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Configuring ShadowingThe fast trans
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Configuring Shadowing4.2.2 Configur
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Start ShadowingThe shadow definitio
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Configuring ShadowingArgumentpiddir
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Shadow ActionsThere are four allowa
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3. Click Resume to resume shadow pr
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5System Failover StrategiesCaché f
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Cold FailoverSome clients cannot af
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In this type of failover two or mor
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Hot FailoverIf a data server fails,
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Cluster Management• ECP Failover6
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Cluster Management• Caché Object
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Cluster ManagementIn a Caché clust
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Cluster ManagementIf you are doing
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Cluster ManagementUse Local Storage
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Cluster Management6.10 DCP and UDP
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Cluster JournalingIn addition to th
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Cluster Journaling7.2 Cluster Failo
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Cluster Journaling2. In between the
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Cluster JournalingThe other cluster
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Cluster JournalingThe following sec
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Cluster Journaling5. Next to Databa
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Cluster JournalingOnly one Caché c
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Cluster JournalingWhen you have ent
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Cluster JournalingBy default, the r
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Cluster JournalingSelection ( if no
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Cluster JournalingCluster Journal R
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Cluster Journaling7.5.1.4 Toggle th
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Cluster JournalingThe routine offer
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Cluster Journaling%SYS>Do ^STURECOV
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Cluster Journalingallows you to mod
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Cluster Journaling7.10 Shadow Infor
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Cluster Journaling^SYS("shdwcli","c
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8Caché Clusters on Tru64 UNIXAlpha
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8.2 TruCluster File System Architec
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cluster members. If there is a dire
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Tuning a Tru64 Caché Cluster Membe
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9Caché and Windows ClustersMicroso
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Single Failover ClusterFailover Clu
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Example ProceduresYou now have a fa
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Example ProceduresOnce finished, th
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[Memory and Startup] page of the Sy
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Example ProceduresCluster Resource
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• Instances CacheA and CacheB can
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2. Install Caché on CLUNODE-2 agai
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ECP FailoverA more complex case is
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ECP Failover• Network Is Interrup
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ECP Failover10.2.4.2 New Cluster Ma
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