Managing Serviceguard A.11.20, March 2013

4 Planning and Documenting an HA Cluster ..................................................97
General Planning ..................................................................................................................97
Serviceguard Memory Requirements.....................................................................................97
Planning for Expansion ......................................................................................................97
Hardware Planning ................................................................................................................98
SPU Information ................................................................................................................99
Network Information .........................................................................................................99
LAN Information ..........................................................................................................99
Setting SCSI Addresses for the Largest Expected Cluster Size ................................................100
Disk I/O Information .......................................................................................................101
Hardware Configuration Worksheet ..................................................................................102
Power Supply Planning .........................................................................................................102
Power Supply Configuration Worksheet .............................................................................103
Cluster Lock Planning............................................................................................................103
Cluster Lock Disk and Re-formation Time .............................................................................104
Planning for Expansion.....................................................................................................104
Using a Quorum Server....................................................................................................104
Quorum Server Worksheet ..........................................................................................104
LVM Planning ......................................................................................................................105
Using Generic Resources to Monitor Volume Groups.............................................................106
Using EMS to Monitor Volume Groups................................................................................106
LVM Worksheet ..............................................................................................................107
CVM and VxVM Planning ....................................................................................................107
CVM and VxVM Worksheet .............................................................................................108
Cluster Configuration Planning ..............................................................................................108
About Cluster-wide Device Special Files (cDSFs)...................................................................109
Points To Note............................................................................................................109
Where cDSFs Reside...................................................................................................109
Limitations of cDSFs................................................................................................110
LVM Commands and cDSFs.....................................................................................110
About Easy Deployment....................................................................................................110
Advantages of Easy Deployment...................................................................................110
Limitations of Easy Deployment......................................................................................111
Heartbeat Subnet and Cluster Re-formation Time .................................................................111
About Hostname Address Families: IPv4-Only, IPv6-Only, and Mixed Mode............................111
What Is IPv4–only Mode?............................................................................................112
What Is IPv6-Only Mode?............................................................................................112
Rules and Restrictions for IPv6-Only Mode.................................................................112
Recommendations for IPv6-Only Mode......................................................................113
What Is Mixed Mode?.................................................................................................113
Rules and Restrictions for Mixed Mode......................................................................114
Cluster Configuration Parameters .......................................................................................114
Cluster Configuration: Next Step........................................................................................131
Package Configuration Planning ............................................................................................131
Logical Volume and File System Planning ...........................................................................131
Planning Veritas Cluster Volume Manager (CVM) and Cluster File System (CFS)........................132
CVM 4.1 and later without CFS.....................................................................................132
CVM 4.1 and later with CFS ........................................................................................132
About the Volume Monitor................................................................................................134
Using the Volume Monitor............................................................................................134
Command Syntax...................................................................................................134
Examples..............................................................................................................135
Scope of Monitoring...............................................................................................135
Planning for NFS-mounted File Systems...............................................................................136
6 Contents