Managing Serviceguard 14th Edition, June 2007

Understanding Serviceguard Software Components
Volume Managers for Data Storage
Chapter 3 121
Redundant Heartbeat Subnet Required
HP recommends that you configure all subnets that connect cluster
nodes as heartbeat networks; this increases protection against multiple
faults at no additional cost.
Heartbeat configurations are configured differently depending on
whether you are using CVM 3.5 or 4.1 and later. You can create
redundancy in the following ways:
1) dual (multiple) heartbeat networks
2) single heartbeat network with standby LAN card(s)
3) single heartbeat network with APA
CVM 3.5 supports only options 2 and 3. Options 1 and 2 are the
minimum recommended configurations for CVM 4.1 and later.
Comparison of Volume Managers
The following table summarizes the advantages and disadvantages of
the volume managers.