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If you found this error :” Failed to get SCSI page 83h VPD descriptors for cluster disk
<number> from <node name> status 2″ after applying SP1 to your W2008R2 cluster, Microsoft has released a fix for it.

The List Potential Cluster Disks storage validation test may display a warning message that resembles the following: “Disk with identifier <value> has a Persistent Reservation on it. The disk might be part of some other cluster. Removing the disk from validation set”

The  hotfix resolves an issue in which the storage test incorrectly runs on disks that are online and not in the Available Storage group.

More details:

You configure a failover cluster that has three or more nodes that are running Windows Server 2008 R2 Service Pack 1 (SP1).

You have cluster disks that are configured in groups other than the Available Storage group or that are used for Cluster Shared Volumes (CSV).

These disks are online when you run the Validate SCSI Device Vital Product Data (VPD) test or the List Potential Cluster Disks storage validation test

More info : http://support.microsoft.com/kb/2531907