HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Redundant Heartbeat Subnets
HP recommends that you configure all subnets that connect cluster nodes as heartbeat networks;
this increases protection against multiple faults at no additional cost.
For CVM 4.1 and later, the minimum recommended configurations are:
1) dual (multiple) heartbeat networks
2) single heartbeat network with standby LAN card(s)
Comparison of Volume Managers
The following table summarizes the advantages and disadvantages of the volume managers.
86 Understanding Serviceguard Software Components