Managing Serviceguard Nineteenth Edition, Reprinted June 2011

Local Switching ............................................................................................................66
Switching Back to Primary LAN Interfaces after Local Switching...........................................69
Remote Switching .........................................................................................................69
Address Resolution Messages after Switching on the Same Subnet.......................................70
Monitoring LAN Interfaces and Detecting Failure: IP Level.......................................................70
Reasons To Use IP Monitoring.........................................................................................70
How the IP Monitor Works.............................................................................................71
Failure and Recovery Detection Times..............................................................................72
Constraints and Limitations.............................................................................................72
Reporting Link-Level and IP-Level Failures................................................................................73
Example 1: If Local Switching is Configured......................................................................73
Example 2: If There Is No Local Switching........................................................................73
Automatic Port Aggregation................................................................................................74
VLAN Configurations..........................................................................................................75
What is VLAN?............................................................................................................75
Support for HP-UX VLAN................................................................................................75
Configuration Restrictions...............................................................................................76
Additional Heartbeat Requirements.................................................................................76
Volume Managers for Data Storage..........................................................................................76
Types of Redundant Storage................................................................................................76
About Device File Names (Device Special Files).....................................................................77
Examples of Mirrored Storage.............................................................................................77
Examples of Storage on Disk Arrays.....................................................................................79
Types of Volume Manager..................................................................................................81
HP-UX Logical Volume Manager (LVM)..................................................................................81
Veritas Volume Manager (VxVM).........................................................................................81
Propagation of Disk Groups in VxVM..............................................................................81
Package Startup Time with VxVM....................................................................................81
Veritas Cluster Volume Manager (CVM)................................................................................82
Cluster Startup Time with CVM........................................................................................82
Propagation of Disk Groups with CVM.............................................................................82
Redundant Heartbeat Subnets.........................................................................................83
Comparison of Volume Managers........................................................................................83
Responses to Failures .............................................................................................................85
System Reset When a Node Fails ........................................................................................85
What Happens when a Node Times Out.........................................................................85
Example..................................................................................................................85
Responses to Hardware Failures...........................................................................................86
Responses to Package and Service Failures ...........................................................................87
Service Restarts .................................................................................................................87
Network Communication Failure .........................................................................................87
4 Planning and Documenting an HA Cluster ..................................................88
General Planning ..................................................................................................................88
Serviceguard Memory Requirements.....................................................................................88
Planning for Expansion ......................................................................................................88
Hardware Planning ................................................................................................................89
SPU Information ................................................................................................................90
Network Information .........................................................................................................90
LAN Information ..........................................................................................................90
Setting SCSI Addresses for the Largest Expected Cluster Size ..................................................91
Disk I/O Information .........................................................................................................92
Hardware Configuration Worksheet ....................................................................................93
Power Supply Planning ...........................................................................................................93
Power Supply Configuration Worksheet ...............................................................................94
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