HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 4.01.00 installation and reference guide (AA-RW7SP-TE, September 2010)

2 Support for load balancing in Failover
Cluster Server environment for Windows
Server 2008 and Windows Server 2008 R2
Load balancing for the cluster devices is enabled by default and cannot be turned OFF.
This section describes the following:
• Recovering inaccessible disk devices
Recovering inaccessible disk devices
If there is a stray reservation on a disk device, the device becomes inaccessible to the host systems
connected to it. This is because the strong reservation type (persistent reservations) supports load
balancing in clusters.
You can use the persistent reservations clear utility that comes with HP MPIO EVA DSM package to
remove the stray reservations. For more information on how to use this utility, see HP MPIO EVA DSM
persistent reservations clear utility.
NOTE:
For Microsoft Windows Server 2008 and Microsoft Windows Server 2008 R2 Failover cluster to work
properly, set the array host mode on the HP CommandView EVA to "Microsoft Windows LH" or set
custom host mode to "00000004198009A8".
HP MPIO Full Featured DSM for EVA4x00/6x00/8x00 family of Disk Arrays 4.01.00 installation
and reference guide 17