The VSS Provider vetoed the operation

[Matthew_Grainge]

We are recieving the above error when attempting to back up one of our servers, after a reboot the backups will work for between 2 days and a week but then fail again.

This is in the application log as event 100 and in the system log as event 20, source volsnap (The shadow copies of volume D: were aborted because of a failed free space computation.)

We have upgraded too the latest version of BESR and the latest version of VSS from Microsoft in an attempt to fix this but it still occurs.

Any ideas?

[Philip_Pearson]

Are you short of hard drive space on d?

Are you backing up C and D, if you are not backing up C and VSS determines that a shadow copy of C needs to be done to back up its data then it will veto the operation.

[Matthew_Grainge]

We are backing up borh C and D.

There is over 1 and a half TB free on D and over 3 TB on the drive where the image is supposed to be written to, so I dont think free space is an issue.

[Philip_Pearson]

The VSS can veto an operation if it does not backup sufficient data, are there other drives on the machine you are not backing up? Are you excluding anything from your selection list

[Matthew_Grainge]

No, everything is backed up (We intend to use this for full restore in any DR situation).

[Philip_Pearson]

Check out this link in msdn, it goes through the intention of VSS and how to utilise it from a programmers point of view.

It may give you some pointers although from the sounds of it you have the bases covered

http://msdn2.microsoft.com/en-us/library/aa384995.aspx

[Matthew_Grainge]

Cheers, I'll have a look through.