HP XP P9000 External Storage Access Manager User Guide (AV400-96607, January 2014)
Options for performing the planned outages.....................................................................46
The procedures for performing planned outages................................................................47
Performing planned outages (quorum disk only) ...............................................................47
Performing planned outages (primary storage system and quorum disk)................................48
Performing planned outages (secondary storage system and quorum disk)............................49
Performing planned outages (both storage systems and quorum disk)...................................50
6 Disaster recovery......................................................................................51
Main types of failures that can disrupt your system......................................................................51
The basic recovery process......................................................................................................51
System failure messages..........................................................................................................51
Detecting failures....................................................................................................................51
Option 1: Check for failover first..........................................................................................51
Using Remote Web Console to check for failover...............................................................52
Using RAID Manager to check for failover........................................................................52
Using multipath software to check for failover....................................................................52
Option 2: Check for failures only.........................................................................................52
Determining which basic recovery procedures to use...................................................................53
Selecting Procedures..........................................................................................................53
Recovery from blocked pair volumes.........................................................................................54
Recovering from primary volume failure on the MCU..............................................................54
Recovering from secondary volume failure on the MCU...........................................................55
Recovering from primary volume failure on the RCU...............................................................56
Recovering from secondary volume failure on the RCU ...........................................................57
Recovery from quorum disk failure............................................................................................57
Replacement of quorum disks..............................................................................................57
Replacing a quorum disk when the MCU is receiving host I/O............................................57
Replacing a quorum disk when the RCU is receiving host I/O.............................................58
Recovery from power failure.....................................................................................................59
primary storage system recovery..........................................................................................59
Recovering the system when the RCU is receiving host I/O updates......................................59
Recovering the system when host I/O updates have stopped...............................................60
Secondary system recovery.................................................................................................61
Recovering the system when the P-VOL is receiving host updates..........................................61
Recovering the system when host updates have stopped.....................................................61
Recovery from failures using resynchronization............................................................................62
Required conditions............................................................................................................62
Determining which resynchronization recovery procedure to use...............................................62
Prerequisites.................................................................................................................63
Procedure....................................................................................................................64
Recovering primary volume from Business Copy secondary volume...........................................64
Prerequisites.................................................................................................................64
Procedure....................................................................................................................64
Recovering secondary volume from Continuous Access Journal primary volume .........................64
Prerequisites.................................................................................................................65
Procedure....................................................................................................................65
Postrequisites.....................................................................................................................65
Recovering from path failures ..................................................................................................65
Allowing host I/O to an out-of-date S-VOL.................................................................................66
Recovery for pairs shared by multiple hosts with VMware.............................................................66
7 Using ESAM in a cluster system..................................................................68
Cluster system architecture.......................................................................................................68
Required software...................................................................................................................68
Supported cluster software.......................................................................................................68
Configuration requirements .....................................................................................................69
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