The latest Hyper-V service packs, updates, and hotfixes for Windows Server 2012 are listed here in chronological order.
Applies To: Windows Server 2012
These updates and hotfixes can help avoid some known issues and may save you a support call.
A hotfix is intended to correct only the problem that is described in the article. You should not apply the hotfix if you have net seen the symptoms.
A catch 22, do you install it to try preventing the problem from occurring or do you only install it if you see the problem and have an outage?
Note: Some updates are required only under certain circumstances, as noted in the table.
See also this Knowledge Base article for a list of updates related to Windows Server 2012 Failover Clustering:
Recommended hotfixes and updates for Windows Server 2012-based Failover Clusters
For previous releases of Hyper-V, reference the following pages:
Hyper-V: Update List for Windows Server 2008 R2
List of updates for Hyper-V in Windows Server 2008
Avoid data corruption with WS2012 Hyper-V cluster connected to a SAN! This bug with ODX and NTFS has caused a lot of pain for me and my team over the past week. Virtual machine files become corrupted during a live migration using ODX. It took down a domain controller and two customer environments. Initial recommendation from MS was to disable ODX. There has been two hotfixes released. Not very trusting of them yet, we opted to disable ODX for now.
We need to update this list, here is another hotfix for WS2012 Hyper-V, "0x000000D1" Stop error on a virtual machine in Windows Server 2012
I totally agree with AustinB.
The mentioned kb2796995 is CRITICAL, the bug causes huge problems.
At the moment it isn't mentioned in the 2012 Failover Cluster fix list either (and it should)
ArdenW edited Revision 10. Comment: Corrected a KB2785638.