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snapshot

Posted on 2014-02-03
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Last Modified: 2014-02-04
I am getting vss writer error everytime when the vmbackup kick in.
I am wondering How the quiesced snapshot works on vmware?
Does vmware API call Microsoft vss writer?
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Question by:sara2000
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by:paulsolov
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That's correct.  If you're doing backups at the same time you may have VSS conflicts
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by:Nick Rhode
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If they are application aware
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by:sara2000
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The backup is not not appaware, just vm backup.
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by:paulsolov
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by:Abhilash
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Yes VMware uses VSS. THis below link explains you how it works
http://vmguru.com/articles/data-protection/8-vmware-vss-explained
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 213 total points
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Do the backups and restores function?

VSS errors can be normal during backups and snapshots.

see my EE Article

HOW TO: VMware Snapshots :- Be Patient

What backup product are you using?
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by:sara2000
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Abhilash:
Thank you for this link , it is interesting.
I only want to protect the VM, because the application is being backup by its own backup unitility.
Can I disable vss option in vmtool?
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by:Andrew Hancock (VMware vExpert / EE MVE)
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Yes, you can remove the VSS Driver.

Run the VMware Tools, setup again, with a Custom option, and you do not have to install the driver.
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by:Abhilash
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by:sara2000
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I should be able to do vm backup even though I disabled vss, am I correct?
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by:Abhilash
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Yes. You will be disabling VSS so you can do VM backup.
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by:Andrew Hancock (VMware vExpert / EE MVE)
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You can always do backups WITHOUT the backup issuing a Snapshot.

We Backup ALL our VMs in an instant, and we never quiesce the VMs.

Therefore the backups we have are crash consistent, and it works for us, and we've been doing this since 2004.
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by:sara2000
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Thank you all.
I disabled the vss option in the vmtools and did not have any issue with application , that is, the service did not stop.
so the vss only require if we do any application backup(SQL database , log etc) otherwise we do not need it, we can always recover the vm and its application installation(sql installation), am I correct?
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by:Andrew Hancock (VMware vExpert / EE MVE)
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Yes, VSS option not required.
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Abhilash earned 215 total points
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It is basically used to quiesce the disk when the backup is happening. When you are doing a SQL backup the transactions keep on happening and its not a consistent backup. So when the disk is quiesced the transactions are held and the backup is taken. It basically gives application consistent quiescing.
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