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jbarrow.viracoribt
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One VM with a backup error

Post by jbarrow.viracoribt » Feb 22, 2013 4:48 pm

I have one VM that won't backup without error. I rebooted the VM and we're still getting the error. I'm not sure what to look at on this specific server, I'm going to check the event logs next.

Here's the error:

2/22/2013 10:05:04 AM :: Failed to prepare guest for hot backup. Error: VSSControl: Failed to prepare guest for freeze, wait timeout 900 sec

Image

tsightler
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Re: One VM with a backup error

Post by tsightler » Feb 22, 2013 5:27 pm

This is a Microsoft VSS error so you'll need to look in the Windows event log for further details as to why the systems was unable to perform a VSS freeze. If you want to get a backup of this VM in the interim you can change the job settings to treat a VSS failure as a warning rather than an error. This will give you a "crash consistent" backup, which I'd rather have than no backup at all.

Probably the most common issue I see for VSS is lack of space on the system drive of the VM, but there are so many things it could be that it's almost impossible to just guess. Based on the VM name this is a SQL server so it's possible it was simply too busy to find a period to "freeze".

jbarrow.viracoribt
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Re: One VM with a backup error

Post by jbarrow.viracoribt » Feb 22, 2013 6:00 pm

Thanks, I will check the event logs in a bit a and report what I find.

jbarrow.viracoribt
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Re: One VM with a backup error

Post by jbarrow.viracoribt » Feb 22, 2013 8:27 pm

Well this gives little info...

It looks like these two errors are logged every hour when a replication job tries to run...

First..
Image

Then..
Image

foggy
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Re: One VM with a backup error

Post by foggy » Feb 22, 2013 8:47 pm

Jonathan, please kindly open a support case and provide case ID here, as it is advised when posting about technical issues (explained when you click New Topic). Thanks.

jbarrow.viracoribt
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Re: One VM with a backup error

Post by jbarrow.viracoribt » Feb 22, 2013 10:25 pm

Done. 00184450

ZachW
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Re: One VM with a backup error

Post by ZachW » Feb 23, 2013 12:29 am

Taking a look at the name of the VM I can assume this is a SQL server. Does the SQL server happen to be hosting the vCenter database?

tsightler
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Re: One VM with a backup error

Post by tsightler » Feb 23, 2013 1:56 am

Good question Zach!

jbarrow.viracoribt
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Re: One VM with a backup error

Post by jbarrow.viracoribt » Mar 07, 2013 3:28 pm

ZachW wrote:Taking a look at the name of the VM I can assume this is a SQL server. Does the SQL server happen to be hosting the vCenter database?
Negative. This is a finance SQL server.

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Re: One VM with a backup error

Post by dellock6 » Mar 07, 2013 8:49 pm

Looking instead at the time of the replica job, is 10 AM so during business hours, could it simply be the SQL server is too busy with I/O activity to correctly reply to a VSS freeze before the timeout? There are some elements that can interfere with VSS, among them:
- lack of free disk space
- high I/O activity
- high number of file fragments
- conflicting VSS providers installed by previous softwares

And others. Also, take a look at this article as a starting point, it also has links to other suggestions:

http://blogs.technet.com/b/askpfeplat/a ... ation.aspx

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Vitaliy S.
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Re: One VM with a backup error

Post by Vitaliy S. » Mar 10, 2013 12:24 pm

Yes, I agree with Luca, I've seen these kind of errors when SQL Server VM was too busy and VSS writer simply couldn't prepare all applications for a freeze operation. Try re-scheduling this job on a different time to see if this resolves the issue or not.

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