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installation and reference guide HP MPIO Full Featured DSM for XP family of Disk Arrays 3.02.00 (AA-RVJ6H-TE, March 2009)

ManualsBrandsHP ManualsSoftwareWindows MPIO DSM for SAN Virtualization Services Platform
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3 Support for load balancing in Microsoft
Cluster Server environments for Windows
Server 2003
This section describes the following:
• Enabling support for load balancing in MSCS environments
• Disabling support for load balancing in MSCS environments
• Recovering inaccessible disk devices
By default, in HP MPIO XP DSM, load balancing is enabled in Microsoft Cluster Server (MSCS)
environments. The MSCS uses SCSI-2 reservations to synchronize access to the cluster-managed
devices. However, HP MPIO XP DSM provides a feature to support load balancing for all HP disk
arrays that support the SCSI-3 persistent reservations management method by mapping the MSCS-issued
SCSI-2 reservations to SCSI-3 persistent reservations.
HP MPIO XP DSM supports load balancing in MSCS environments only under the following conditions:
• All nodes in the cluster must have the same version of the HP MPIO XP DSM installed.
• Support for load balancing in MSCS environments must be enabled on all cluster nodes in the HP
MPIO XP DSM.
• The disk array containing the cluster resources must support the SCSI-3 persistent reservations.
NOTE:
Contact HP technical support for details on disk arrays and the firmware revisions that support persistent
reservations.
Enabling support for load balancing in MSCS environments
You can enable load-balancing support in MSCS environments while installing the HP MPIO XP DSM
or anytime after the installation.
CAUTION:
You must enable the load-balancing feature on all nodes in the cluster. If the setting is not consistent
across all cluster nodes, the cluster node failover functionality can be impaired.
To enable load balancing at the time of installing HP MPIO XP DSM, select Enable Load Balancing
in Cluster in the Configuration Settings window.
To enable load balancing after you have installed HP MPIO XP DSM, complete the following steps:
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