Managing Serviceguard 14th Edition, June 2007

Planning and Documenting an HA Cluster
Cluster Configuration Planning
Chapter 4 157
Heartbeat configuration requirements:
A minimum Serviceguard configuration on HP-UX 11i
v2 or 11i v3 needs two network interface cards for the
heartbeat in all cases, using one of the following
configurations:
• Two heartbeat subnets; or
• One heartbeat subnet with a standby; or
• One heartbeat subnet using APA with two physical
ports in hot standby mode or LAN monitor mode.
Considerations for CVM:
• If you will be using Veritas CVM 4.1 or later,
multiple heartbeats are permitted, and you must
configure either multiple heartbeat subnets or a
single heartbeat subnet with a standby. HP
recommends multiple heartbeats.
• If you will be using CVM 3.5, however, you can only
use a single heartbeat subnet; in this case,
configure the heartbeat either with a standby LAN
or as a group of aggregated ports on each node. If
you use aggregated ports (APA), HP recommends
using Hot Standby mode to eliminate the single
point of failure (SPOF) that a single switch
represents. See Chapter 3 of the HP Auto Port
Aggregation Administrator’s Guide at
http://docs.hp.com -> I/O Cards and
Networking Software -> Auto Port
Aggregation (APA) for more information. A
standby LAN always uses two switches and thus
does not entail a SPOF.
• You cannot change the heartbeat configuration
while a cluster that uses CVM is running.
(CVM is not available on all systems; see “About
Veritas CFS and CVM from Symantec” on page 29.)