Managing Serviceguard Eighteenth Edition, September 2010

Additional Heartbeat Requirements......................................................................106
Volume Managers for Data Storage..................................................................................106
Types of Redundant Storage.......................................................................................106
About Device File Names (Device Special Files).........................................................106
Examples of Mirrored Storage.....................................................................................107
Examples of Storage on Disk Arrays...........................................................................110
Types of Volume Manager...........................................................................................112
HP-UX Logical Volume Manager (LVM)....................................................................112
Veritas Volume Manager (VxVM)...............................................................................112
Propagation of Disk Groups in VxVM...................................................................113
Package Startup Time with VxVM.........................................................................113
Veritas Cluster Volume Manager (CVM)....................................................................113
Cluster Startup Time with CVM............................................................................114
Propagation of Disk Groups with CVM................................................................114
Redundant Heartbeat Subnets...............................................................................114
Comparison of Volume Managers...............................................................................114
Responses to Failures .......................................................................................................116
System Reset When a Node Fails ...............................................................................116
What Happens when a Node Times Out...............................................................117
Example............................................................................................................117
Responses to Hardware Failures.................................................................................118
Responses to Package and Service Failures ................................................................119
Service Restarts ...........................................................................................................119
Network Communication Failure ..............................................................................120
4 Planning and Documenting an HA Cluster ...............................................................................121
General Planning .............................................................................................................121
Serviceguard Memory Requirements..........................................................................122
Planning for Expansion ..............................................................................................122
Hardware Planning ..........................................................................................................122
SPU Information .........................................................................................................123
Network Information ..................................................................................................124
LAN Information ...................................................................................................124
Setting SCSI Addresses for the Largest Expected Cluster Size ..................................125
Disk I/O Information ..................................................................................................126
Hardware Configuration Worksheet ..........................................................................127
Power Supply Planning ...................................................................................................128
Power Supply Configuration Worksheet ...................................................................129
Cluster Lock Planning......................................................................................................129
Cluster Lock Disk and Re-formation Time .................................................................130
Planning for Expansion...............................................................................................130
Using a Quorum Server...............................................................................................130
Quorum Server Worksheet ....................................................................................131
6 Table of Contents