HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

HP Cluster Extension ..........................................................................................................26
HP Metrocluster Continuous Access......................................................................................27
HP Continentalcluster..........................................................................................................27
Reduced-availability configurations...........................................................................................27
Single-fabric configuration..................................................................................................27
Single-switch configuration..................................................................................................28
Single-HBA configuration....................................................................................................29
Advanced configurations.........................................................................................................29
Five-fabric configuration......................................................................................................29
Six-fabric configuration.......................................................................................................32
4 Planning the array configuration.................................................................35
Planning disk groups...............................................................................................................35
Determining the number of disk groups.................................................................................35
Specifying disk group properties..........................................................................................35
Planning DR groups................................................................................................................36
DR group guidelines ..........................................................................................................36
Implicit LUN transition and HP P6000 Continuous Access...................................................37
DR group name guideline..............................................................................................37
Increasing the size of the write history log file in enhanced or basic asynchronous mode........38
DR groups with FATA or SAS Midline drives...........................................................................38
Planning the data replication protocol.......................................................................................38
Selecting the data replication protocol..................................................................................39
Data replication protocol performance considerations.............................................................40
Tunnel thrash.....................................................................................................................41
Planning for DR group write history logs....................................................................................42
Logging in synchronous or basic asynchronous mode..............................................................42
Logging in enhanced asynchronous mode.............................................................................42
Normalization...................................................................................................................43
DR group write history log size............................................................................................43
Write history log size in synchronous or basic asynchronous mode.......................................44
Write history log file size in enhanced asynchronous mode.................................................44
Incorrect error message for minimum asynchronous replication log size................................44
Log size displayed incorrectly when creating DR groups in a mixed controller software
environment .................................................................................................................44
DR group write history log location......................................................................................44
Planning replication relationships..............................................................................................46
Bidirectional replication......................................................................................................46
System fan-out replication....................................................................................................47
Fan-in replication...............................................................................................................48
Cascaded replication.........................................................................................................49
5 Planning the solution.................................................................................50
Operating system considerations..............................................................................................50
Supported operating systems...............................................................................................50
Operating system capabilities..............................................................................................50
Boot from SAN.............................................................................................................50
Bootless failover............................................................................................................50
6 Implementing remote replication.................................................................51
Remote replication configurations..............................................................................................51
Verifying array setup...............................................................................................................51
Installation checklist............................................................................................................51
Verifying Fibre Channel switch configuration..........................................................................51
B-series switch configuration............................................................................................52
C-series switch configuration...........................................................................................52
4 Contents