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

Setting up RAID Manager
In addition to the cluster software it integrates with, P9000 Cluster Extension depends on RAID
Manager. Before configuring P9000 Cluster Extension, verify that RAID Manager is installed and
configured, and that the host and disk array systems are properly configured as described in the
following topics.
Creating RAID Manager command devices
To control Continuous Access mirrored disks from a clustered server, install RAID Manager on the
server and configure a special disk, called a command device. The command device must not be
an MSCS resource, cannot be paired, and is assigned to a 36 MB or greater CVS volume. The
command device is identified by CM appended to the emulation type.
RAID Manager command devices can be accessed by redundant paths. HP recommends redundant
paths to prevent P9000 Cluster Extension from aborting if one path to the command device is
missing. See the RAID Manager documentation for more information.
Configuring RAID Manager command devices
In-band and out-of-band communication
Previous versions of XP Cluster Extension used in-band communication through the FC link to
communicate with XP arrays. P9000 Cluster Extension supports in-band communication through
the FC link and out-of-band communication through the IP link. Out-of-band communication is
supported only with P9000 arrays and P9000 RAID Manager.
When out-of-band communication is used, P9000 Cluster Extension must be configured to use
command device authentication.
When in-band communication is used, command device authentication must be configured only
if the command device user authentication property is enabled. No authentication credentials are
required if the user authentication property is disabled.
When command device authentication is configured, P9000 Cluster Extension logs in to a command
device in order to perform RAID Manager replication and provisioning commands.
Command device authentication
P9000 Cluster Extension supports command device user authentication for physical and virtual
command devices on P9000 disk arrays. When you enable command device user authentication,
you must add the command device credentials to P9000 Cluster Extension as part of the P9000
Cluster Extension configuration procedure.
NOTE: HP recommends using the same user name and password for all command devices
configured in a single HORCM file. For more information, see the RAID Manager documentation.
Creating RAID Manager instances
P9000 Cluster Extension requires at least one instance of RAID Manager. P9000 Cluster Extension
starts the configured RAID Manager instance if it is not running. However, if the RAID Manager
instance cannot be started or returns an error, P9000 Cluster Extension can switch to an alternate
RAID Manager instance.
• Ensure that the path to the RAID Manager binary files is included in the PATH environment
variable.
• Create a RAID Manager instance to control pair operations and to gather disk array status
information. Because P9000 Cluster Extension switches to the next available instance when
a current instance becomes unavailable, HP recommends that you create several RAID Manager
instances to provide redundancy. Bear in mind, however, that the RAID Manager instance
16 P9000 Cluster Extension features