Recommended post W2K8R2 SP1 Clustering and Hyper-V Hotfixes

One of the visitors of this blog asked the question if we could publish a list of recommended post Windows Server 2008 R2 SP1 hotfixes related to either Clustering or Hyper-V. Well here it is!
For a complete overview of what was rolled-up in SP1 take a look at the Excel sheet (Updates in Win7 and WS08R2 SP1.xls) which can be found on here.
Note I. Microsoft will release hotfixes if a issue occurs that needs to fixed before releasing a roll-up update or a service pack. However, the hotfix in question is intended to correct only the problem that is described in the article. Apply the hotfix only to systems that are experiencing the problem that is described in the articles. The hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
Note II. Updates can be applicable to Windows Server 2008 R2 (RTM) and/or Windows Server 2008 R2 SP1.

Title	Type	Required	IC Version
KB976932: Windows 7 en Windows Server 2008 R2 Service Pack 1	Service Pack	Yes	6.1.7601.17514
KB2446607: You cannot enable BitLocker on a disk volume in Windows Server 2008 R2 if the computer is a failover cluster node	Cluster Hotfix	Yes, only applicable to described situation
KB2462576: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2485543: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2494162: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2485986: An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2	Hyper-V Hotfix	Yes, only applicable to described situation
KB2519946: Timeout Detection and Recovery (TDR) randomly occurs in a virtual machine that uses the RemoteFX feature in Windows Server 2008 R2	Hyper-V Hotfix	Yes, only applicable to described situation
KB2520235: "0x0000009E" Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2517329: 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	Hyper-V Hotfix	Yes, only applicable to described situation
KB2460971: MPIO failover fails on a computer that is running Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2494036: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2523676: GPU is not accessed leads to some VMs that use the RemoteFX feature to not start in Windows Server 2008 R2 SP1	Hyper-V Hotfix	Yes, only applicable to described situation
KB2521348: A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to "Offline All"	Hyper-V Hotfix	Yes, only applicable to described situation
KB2494016: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2531907: Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1	Cluster Hotfix	Yes, only applicable to described situation
KB2512715: 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	Windows Update	Yes, only applicable to described situation
KB2525835: MS11-047: Vulnerability in Microsoft Hyper-V could cause denial of service: June 14, 2011	Security Bulletin	Yes
KB2549448: Cluster service still uses the default time-out value after you configure the regroup time-out setting in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2549472: Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2552040: A Windows Server 2008 R2 failover cluster loses quorum when an asymmetric communication failure occurs	Cluster Hotfix	Yes, only applicable to described situation
KB2496034: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2550569: "0×20001" Stop error when you start a Linux VM in Windows Server 2008 R2 SP1	Hyper-V Hotfix	Yes, only applicable to described situation
KB2580360: A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2582281: Slow failover operation if no router exists between the cluster and an application server	Cluster Hotfix	Yes, only applicable to described situation
KB2575625: Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2578113: The Cluster service takes about 30 seconds to fail over IPv6 IP addresses in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2579052: 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	Cluster Hotfix	Yes, only applicable to described situation
KB2550886: A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working	Cluster Hotfix	Yes, only applicable to described situation
KB2550894: Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2	Cluster Hotfix	Yes, only applicable to described situation
KB2547551: Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2	Hyper-V Hotfix	Yes, only applicable to described situation
KB2550894: Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008 NEW!	Hyper-V Hotfix	Yes, only applicable to described situation

The information is gathered from a number of places. First of all the from the monthly or two-monthly “released knowledge base articles” that we publish on this blog which can be found here: February, March, April, May-Juneand July-August (yet to be unpublished). Besides these overviews I used these websites for layout and checks: “List of Hyper-V Packages Updated After the Release of Windows Server 2008 R2 Service Pack 1 (SP1)” and “List of Cluster Hotfixes for Windows Server 2008 R2”.