November 2014 Windows Update Rollup breaks Hyper-V backup

[Gostev]

Be aware that November 2014 Update Rollup for Windows Server 2012/2012R2 appears to break Hyper-V backup:
http://www.reddit.com/r/sysadmin/commen ... kb3000853/

Presumably, all Hyper-V backup solutions are impacted, including Microsoft's own DPM.

In Veeam B&R, the error will look like this:

Code: Select all

Unable to allocate processing resources. Errors: Failed to create snapshot for vm

I am aware of at least two support cases at this point where this pattern was noticed.

Please do not install this update to you the Hyper-V hosts until further notice.
If you have already installed, uninstalling said update fixes the issue.

[Gostev]

Per my contact at Microsoft, installing the following hot fix on top of said Update Rollup should also help > http://support.microsoft.com/kb/2996928/
I have just received this info, and we did not have a chance to test this one yet, so use at your own risk.

Note that this hot fix is said to apply to Hyper-V 2012 only (not for 2012 R2). It is unclear at the moment if 2012 R2 is also impacted by the issue.

[Gostev]

I am hearing from some folks outside Veeam that the issue impacts both Hyper-V 2012 (KB3000853) and 2012 R2 (KB3000850). Changing the topic name accordingly for now.

[Gostev]

After 24 hours, we still have no support cases for Hyper-V 2012 R2 and KB30000850.
Only Hyper-V 2012 and KB3000853 *seems* to be affected. We will keep monitoring.

[uros678]

Hello,

I can confirm that the http://support.microsoft.com/kb/2996928/ hotfix does indeed fix the problem on Windows 2012.

Kind regards,

Uros

[RWeiss]

Hi there,

We have encountered this issue ("Unable to allocate processing resources...") on one of our Windows Server 2012 R2 hosts with B&R 7. Over the weekend one VM failed (even after 3 retries). Today, 2 VMs failed but they both were successfully backed up after another Retry.

For us, it is not serious enough to open a ticket over this, I just wanted to let you know that R2 really also seems to be affected by this. We have installed KB30000850 last week.

[Ebrink]

I have the same issue on my Windows 2012R2 Hyper V hosts. Also with KB30000850 installed

[foggy]

Erik, please open a case with technical support, unless you've already done so. Thanks!

[Ebrink]

I have uninstalled the specified update from all of the hosts on my cluster and can confirm that my backups are good again.
Hope A fix for 2012 R2 will also become avaliable soon so I can re-apply the November 2014 Update Rollup.

[DChiavari]

It seems MSFT has solved the issue, according to this post: http://blogs.msdn.com/b/taylorb/archive ... stall.aspx

[johncduffy]

HI Anton.
Thanks for this.
I logged this up with a ticket 00693646 but had to find this fix myself.
I would appreciate you communicating this to your staff.
My backups were down since I upgraded to version 8 which was 6 days.
I installed KB2996928 and my backup is now working again.
Regards
John

[m_zolkin]

Hi John,

The message has been delivered We'll make sure all the newcomers are aware of the question in subject.

Thx,
Mike

[RWeiss]

We had a backup of a 2012 VM failing since the November Update Rollup (Hyper-V running on 2012 R2 host). We installed the updates over this weekend and the backup seems to be working again (B&R 7).