HP StorageWorks P9000 Cluster Extension Software Installation Guide (TB534-96008, February 2011)

Enabling RAID Manager instances
To enable RAID Manager instances to start at system boot, configure the /etc/init.d/raidmgr
file.
In the following example, instances 11 and 22 are enabled:
# Generic init script for RAID Manager provided with P9000 Cluster Extension
#
# Note that there are two methods by which we can start
# RAID Manager at boot time.
# The default method is to look for files of the form
# /etc/horcm<instance number>.conf
# and thus determine the instance numbers.
#
# However, we recommend to statically define the instances which need to be
# started, then uncomment and edit the following line:
#
RAIDMGR_INSTANCES="11 22"
...
Configuring multipath software
For information about installing and configuring the Multi-path Device Mapper for Linux Software,
see the Multi-path Device Mapper for Linux Software application and release notes. You can find
these documents on the Manuals page of the HP Business Support Center website: http://
www.hp.com/support/manuals. In the Storage Software section, click Multi-path Device Mapper
for Linux Software.
To use an HBA driver's native multipath failover, follow the instructions in the documentation
provided by the manufacturer.
Load balancing affects multipath performance. To ensure optimal load balancing, see the installation
and configuration procedures in your multipath software documentation.
NOTE: For a list of supported multipath software, see the P9000 and XP array information on
the HP SPOCK website: http://www.hp.com/storage/spock.
Configuring LVM
The shared data disks used by P9000 Cluster Extension reside on a disk array that is mirrored to
the remote data center using the Continuous Access software. The P-VOLs have read/write access
and the S-VOLs have read-only access. To access disks that are in read/write mode, the P-VOL of
the mirrored disk pair must be in the local (currently active) data center.
Complete the following procedure to make each disk accessible to the nodes in the remote data
center:
1. On the P-VOL side (local data center), create the volume groups, logical volumes, and file
systems that will be used with the Linux clusters.
2. Use the RAID Manager horctakeover command to switch the RAID Manager device groups
from site A to site B. This allows nodes in the remote data center to access the shared disks
with read/write access.
3. Create mount points on each node in the remote data center, and then use vgscan to import
volume groups and logical volumes.
4. Make sure that the volume groups are not activated automatically at system boot time.
22 Installing P9000 Cluster Extension Software for Linux