HP StorageWorks P9000 Cluster Extension Software Administrator Guide (TB534-96009, February 2011)

numbers used for the RaidManagerInstances object must be the same among all servers using
P9000 Cluster Extension.
• HP recommends that the RAID Manager instances be running at all times to provide the fastest
failover capability. P9000 Cluster Extension provides scripts to include the RAID Manager
startup procedure in the system startup file (for example, /etc/inittab for non-Windows
systems). See “Starting and stopping the RAID Manager instances” (page 17) for more
information. P9000 Cluster Extension starts the configured RAID Manager instances if it cannot
find any running instance.
Creating RAID Manager device/copy groups
A device/copy group is the unit in which the failover/failback operation is performed. A device/
copy group can contain several volume groups.
Configure a single device/copy group for a cluster group (MSCS) or resource (SLE HA, RHCS).
This device/copy group must include all disks being used for the application service.
The RAID Manager configuration file (horcmX.conf) is used to map device/copy groups to the
internal disk array disks. A device/copy group is the common unit for failover operations initiated
from the server side.
Network considerations
Because RAID Manager is essential to P9000 Cluster Extension, HP recommends that you use the
heartbeat network (a private network) for RAID Manager communications. Alternative network
paths are highly recommended. Configure the networks RAID Manager uses for each device/copy
group in the HORCM_INST part of the RAID Manager configuration file.
Starting and stopping the RAID Manager instances
Start the RAID Manager instances for P9000 Cluster Extension at system boot time to provide the
fastest access to disk status information.
P9000 Cluster Extension provides scripts (Linux/UNIX) or a service (Windows) to integrate the
RAID Manager instance startup into the system startup process. This feature reduces resource group
failover times because the P9000 Cluster Extension resource does not need to start the RAID
Manager instances. If the system cannot automatically start and monitor RAID Manager instances,
you can start and stop RAID Manager with the following commands:
Linux
horcmstart.sh instance numbers
horcmshutdown.sh instance_numbers
Windows
horcmstart instance_numbers
horcmshutdown instance_numbers
Starting RAID Manager without specifying an instance number will start instance 0 with the
associated horcm.conf file. For this reason, zero (0) is not recommended as an instance number
for a P9000 Cluster Extension RAID Manager instance.
Planning for P9000 Cluster Extension 17