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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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LVL 42

Expert Comment

by:paulsolov
ID: 39830052
That's correct.  If you're doing backups at the same time you may have VSS conflicts
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LVL 22

Expert Comment

by:Nick Rhode
ID: 39830084
If they are application aware
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Author Comment

by:sara2000
ID: 39830122
The backup is not not appaware, just vm backup.
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
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by:paulsolov
paulsolov earned 72 total points
ID: 39830143
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Assisted Solution

by:Abhilash
Abhilash earned 215 total points
ID: 39830189
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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LVL 119

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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 213 total points
ID: 39830213
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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Author Comment

by:sara2000
ID: 39830226
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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LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 213 total points
ID: 39830247
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
Abhilash earned 215 total points
ID: 39830249
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Author Comment

by:sara2000
ID: 39830258
I should be able to do vm backup even though I disabled vss, am I correct?
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Expert Comment

by:Abhilash
ID: 39830281
Yes. You will be disabling VSS so you can do VM backup.
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LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 213 total points
ID: 39830380
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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Author Comment

by:sara2000
ID: 39832518
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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LVL 119
ID: 39832526
Yes, VSS option not required.
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Accepted Solution

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Abhilash earned 215 total points
ID: 39832547
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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