HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

Creating XP RAID Manager device groups
A device group is the unit in which the failover/failback operation is performed. A device group can
contain several volume groups.
Configure a single device group for a service group (VCS), resource group (HACMP), cluster group
(MSCS), or resource (SLE HA, RHCS). This device group must include all disks being used for the
application service.
The XP RAID Manager configuration file (horcmX.conf) is used to map device groups to the internal
disk array disks. A device group is the common unit for failover operations initiated from the server
side.
Network considerations
Because XP RAID Manager is essential to XP Cluster Extension, HP recommends that you use the
heartbeat network (a private network) for XP RAID Manager communications. Alternative network
paths are highly recommended. Configure the networks XP RAID Manager uses for each device group
in the HORCM_INST part of the XP RAID Manager configuration file.
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