HP XP Cluster Extension Software Administrator Guide

about configuring CSV disk for CLX, see “Cluster Extension Cmdlets for CSV and Virtual Machine
Management” (page 52).
Setting up RAID Manager
In addition to the cluster software it integrates with, HP XP Cluster Extension depends on RAID
Manager. Before configuring HP XP 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 MSFC 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 HP XP 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 HP XP Cluster Extension used in-band communication through the FC link to
communicate with XP arrays. HP XP 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 XP arrays and XP RAID Manager.
When out-of-band communication is used, HP XP 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, HP XP Cluster Extension logs in to a command
device in order to perform RAID Manager replication and provisioning commands.
Command device authentication
HP XP Cluster Extension supports command device user authentication for physical and virtual
command devices on XP disk arrays. When you enable command device user authentication, you
must add the command device credentials to HP XP Cluster Extension as part of the HP XP 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
HP XP Cluster Extension requires at least one instance of RAID Manager. HP XP 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, HP XP 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 HP XP Cluster Extension switches to the next available instance when a
current instance becomes unavailable, HP recommends that you create several RAID Manager
Planning for HP XP Cluster Extension 11