Watch out installing SP1 on your Hyper-V R2 cluster

Ivo Beerens
Date : March 25, 2011
Categories : hyper-v
Tags : hyper-v-r2

Yesterday I spoke a customer who has problems after applying Windows 2008 R2 SP1 on his 5 node Hyper-V cluster. When validating the storage on the cluster, the following error “disk with identifier “2ef8c0……” has a persistent reservation” is displayed on multiple cluster disks.

The problem can occur in the following scenario:

**- 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.**

In this scenario, the Validate SCSI Device Vital Product Data (VPD) test fails. Additionally, you receive an error message that resembles the following:

Failed to get SCSI page 83h VPD descriptors for cluster disk from status 2

The List Potential Cluster Disks storage validation test may display a warning message that resembles the following:

Disk with identifier has a Persistent Reservation on it. The disk might be part of some other cluster. Removing the disk from validation set.

**A hotfix (KB 2531907) is now available that addresses the Win2008 R2 service pack 1 issue with Validate on a 3+ node cluster. You can find more information and the hotfix to download at the following link:
**KB2531907

My advice, do not install SP1 on your production Hyper-V cluster(s) till Microsoft has solution for this nasty problem!