Recently I saw some clusters that are not patched and or where not aware that there were hotfixes.
So here is a list of required and optional Windows 2008R2 SP1 hotfixes.
This list is found on several pages on the web and could be handy.
Windows & Hyper-V : Required Hotfixes
Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1
http://support.microsoft.com/kb/2531907 (required for 3+ node Hyper-V clusters)
The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1
http://support.microsoft.com/kb/2263829
The Cluster service stops unexpectedly on a Windows Server 2008 R2 failover cluster node when you perform multiple backup operations in parallel on a cluster shared volume
http://support.microsoft.com/kb/2494162
MPIO failover fails on a computer that is running Windows Server 2008 R2
http://support.microsoft.com/kb/2460971
The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2
http://support.microsoft.com/kb/2522766
Performance decreases in Windows Server 2008 R2 when the Hyper-V role is installed on a computer that uses Intel Westmere or Sandy Bridge processors
http://support.microsoft.com/kb/2517329
Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access.
http://support.microsoft.com/kb/2494016
Optional Hotfixes
An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2
http://support.microsoft.com/kb/2485986
“0x0000009E” Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2
http://support.microsoft.com/kb/2520235
A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to Offline All
http://support.microsoft.com/kb/2521348
Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2
http://support.microsoft.com/kb/2549472
Cluster service stops when an error occurs in the registry replication process of a failover cluster in Windows Server 2008 R2 or in Windows Server 2008
http://support.microsoft.com/kb/2496034
0×20001 Stop error when you start a Linux VM in Windows Server 2008 R2 SP1
http://support.microsoft.com/kb/2550569
A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2
http://support.microsoft.com/kb/2580360
Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2
http://support.microsoft.com/kb/2575625/en-us?sd=rss&spid=14134
New registration entries are added to the Persistent Reservation table when the physical disk resource that is associated with the CSV is taken offline on a Windows Server 2008 R2-based Failover Cluster
http://support.microsoft.com/kb/2579052/en-us?sd=rss&spid=14134
A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working
http://support.microsoft.com/kb/2550886
Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008
http://support.microsoft.com/kb/2550894
Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2
http://support.microsoft.com/kb/2547551
Microcode update for Intel processors in Windows 7 or in Windows Server 2008 R2
http://support.microsoft.com/kb/2493989
Corrupted VSS snapshot
http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=975688&kbln=en-us
FIX: The guest operating system may crash (STOP 0xd) when you perform a live migration of Hyper-V virtual machines in a Windows Server 2008 R2 environment
http://support.microsoft.com/kb/2636573
Hotfixes that were rolled-up to 976932 — Windows 7 and Windows Server 2008 R2 Service Pack 1 ( SP1 )
- 974930 — An application or service that queries information about a failover cluster by using the WMI provider may experience low performance or a time-out exception
- 976571 — Stability update for Windows Server 2008 R2 Failover Print Clusters
- 978001 — Cluster resources do not automatically fail over to another node when you disconnect the private and public network interfaces in a Windows Server 2008 failover cluster or in a Windows Server 2008 R2 failover cluster
- 978562 — The "Validate Multiple Arbitration" test on a Windows Server 2008 R2-based failover cluster may incorrectly fail
- 979782 — An update rollup package for the Validate a Configuration Wizard of the Failover Clustering feature is available for Windows Server 2008 R2
- 2277439 — The Cluster service stops responding if you run backup applications in parallel in Windows Server 2008 R2
- 2294255 — MS10-086: Vulnerability in Windows shared cluster disks could allow tampering
- 2353832 — Authentication requests between nodes in the same failover cluster may be unable to use the Kerberos protocol if the Negotiate SSP is specified in Windows Server 2008 R2
- 2353808 — The WINS replication operation fails on a failover cluster node that is running Windows Server 2008 R2
Hotfixes that were released after Windows 7 and Windows Server 2008 R2 Service Pack 1 (applicable to both SP0 and SP1 systems)
- 2446607 — You cannot enable BitLocker on a disk volume in Windows Server 2008 R2 if the computer is a failover cluster node
- 2462576 — The NFS share cannot be brought online in Windows Server 2008 R2 when you try to create the NFS share as a cluster resource on a third-party storage disk
- 2485543 — You cannot access or mount a Windows Server 2008 R2-based NFS share after a failover if the NFS share uses Krb5 or Krb5i authentication
- 2494016 — Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access
- 2494036 — A hotfix is available to let you configure a cluster node that does not have quorum votes in Windows Server 2008 and in Windows Server 2008 R2
- 2494162 — The Cluster service stops unexpectedly on a Windows Server 2008 R2 failover cluster node when you perform multiple backup operations in parallel on a cluster shared volume
- 2496034 — Cluster service stops when an error occurs in the registry replication process of a failover cluster in Windows Server 2008 R2 or in Windows Server 2008
- 2512715 — Validate Operating System Installation Option test may identify Windows Server 2008 R2 Server Core installation type incorrectly in Windows 7 or in Windows Server 2008 R2
- 2520235 — "0x0000009E" Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2
- 2531907 — Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1
- 2549448 — Cluster service still uses the default time-out value after you configure the regroup time-out setting in Windows Server 2008 R2
- 2549472 — Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2
- 2550886 — A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working
- 2550894 — Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008
- 2552040 — A Windows Server 2008 R2 failover cluster loses quorum when an asymmetric communication failure occurs
- 2575625 — Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2
- 2578113 — The Cluster service takes about 30 seconds to fail over IPv6 IP addresses in Windows Server 2008 R2
- 2579052 — New registration entries are added to the Persistent Reservation table when the physical disk resource that is associated with the CSV is taken offline on a Windows Server 2008 R2-based Failover Cluster
- 2580360 — A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2
- 2606025 — "0x000000D5" Stop error on a failover cluster node that has special pool enabled and that is running Windows Server 2008 R2
- 2648385 — You cannot use WMI to manage CSV resources in Windows Server 2008 R2
- 2637197 — CSV LUNs fail if you use a VSS hardware provider to back up virtual machines on a Windows Server 2008 R2-based cluster
- 2616514 — Cluster service sends unnecessary registry key change notifications among cluster nodes in Windows Server 2008 or in Windows Server 2008 R2
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