Managing HP Serviceguard for Linux Ninth Edition, April 2009

Types of IP Addresses...................................................................................................73
Adding and Deleting Relocatable IP Addresses ..........................................................73
Load Sharing ...........................................................................................................73
Bonding of LAN Interfaces ...........................................................................................74
Bonding for Load Balancing..........................................................................................77
Monitoring LAN Interfaces and Detecting Failure: Link Level....................................78
Monitoring LAN Interfaces and Detecting Failure: IP Level........................................78
Reasons To Use IP Monitoring.................................................................................79
How the IP Monitor Works......................................................................................79
Failure and Recovery Detection Times...............................................................81
Constraints and Limitations.....................................................................................81
Reporting Link-Level and IP-Level Failures.................................................................82
Package Switching and Relocatable IP Addresses........................................................82
Address Resolution Messages after Switching on the Same Subnet ...........................83
Volume Managers for Data Storage....................................................................................83
Storage on Arrays..........................................................................................................84
Monitoring Disks...........................................................................................................84
More Information on LVM............................................................................................85
About Persistent Reservations............................................................................................85
Rules and Limitations....................................................................................................86
How Persistent Reservations Work...............................................................................86
Responses to Failures .........................................................................................................88
Reboot When a Node Fails ...........................................................................................88
What Happens when a Node Times Out.................................................................88
Example .............................................................................................................88
Responses to Hardware Failures ..................................................................................89
Responses to Package and Service Failures .................................................................90
Service Restarts .......................................................................................................91
Network Communication Failure ...........................................................................91
4 Planning and Documenting an HA Cluster .................................................................................93
General Planning ...............................................................................................................93
Serviceguard Memory Requirements...........................................................................94
Planning for Expansion ................................................................................................94
Hardware Planning ...........................................................................................................94
SPU Information ...........................................................................................................94
LAN Information ..........................................................................................................95
Shared Storage...............................................................................................................95
FibreChannel............................................................................................................95
Multipath for Storage ..............................................................................................96
Disk I/O Information ....................................................................................................96
Hardware Configuration Worksheet ............................................................................97
Power Supply Planning .....................................................................................................97
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