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Post-SP1 hotfixes recommended for W2K8R2 Hyper-V hosts

Post-SP1 hotfixes recommended for W2K8R2 Hyper-V hosts

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Here is a quick round-up of post-SP1 hotfixes that it is good to know about, if you are running Hyper-V – I have summarized the file(s) updated and their version details for quick reference so you can see if they are applicable for you.


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

Files updated:
Hvax64.exe 6.1.7601.17579 (SP1 GDR)
Hvboot.sys 6.1.7601.17579 (SP1 GDR)
Hvix64.exe 6.1.7601.17579 (SP1 GDR)
Hvax64.exe 6.1.7601.21683 (SP1 LDR)
Hvboot.sys 6.1.7601.21683 (SP1 LDR)
Hvix64.exe 6.1.7601.21683 (SP1 LDR)


An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2

Files updated:
Hyper-v_model.ps1 (dated 2011-01-13)


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

Files updated:
Csvfilter.sys 6.1.7601.21639 (SP1 LDR)


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

Files updated:
Clussvc.exe 6.1.7601.21639 (SP1 LDR)


The Hyper-V Virtual Machine Management service stops responding intermittently when the service is stopped in Windows Server 2008 R2

Files updated:
Vmms.exe 6.1.7601.21642 (SP1 LDR)


Also, the Microsoft iSCSI Software Target is now a free download - see this Virtualization Blog post for details.

  • Hi Paul,

    isn't KB2496089 already included in SP1? as far as I can confirm, this patch is included in the SP1 please see my reference reference -> Hotfixes and Security Updates included in Windows 7 and Windows Server 2008 R2 Service Pack 1.xls -> www.microsoft.com/.../details.aspx



  • Hi, it was meant to be, and if you check support.microsoft.com/.../2496089 it does only show in the details that it's pre-SP1 (build 6.1.7600.xxxx).

    However if you continue through the "View and request hotfix downloads" link you can see there are 2 packages: sp1 and sp2 (so these apply to the RTM and SP1 branches respectively).



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