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Server 2008 R2 VSS – volsnap error: “The shadow copies of volume C: were aborted because of a failed free space computation.”

While trying to get a DPM backup of a server we were seeing volsnap errors every time we tried to sync the target, and the same error if we tried to configure shadow copies directly.

The volsnap errors referenced an inability to calculate free space on volume in question, specifically: “The shadow copies of volume C: were aborted because of a failed free space computation.”. There are lots of articles referencing this issue on 2003 but nothing at all on 2008 or 2008 R2.

All VSS providers were showing healthy, so looked at more general VSS troubleshooting and came across this:

Specifically, following these steps as detailed by Shaon Shan:
As always ensure you backup the registry before making any changes.

1. Stop the Following services:

Volume Shadow Copy Service.
MS Software Shadow Copy Provider — keep it stopped
“COM+ event system”
“COM+ System Application”

2. Take the backup of the “Subscriptions” key

HKLM\Software\Microsoft\EventSystem\{26c409cc-ae86-11d1-b616-00805fc79216}\Subscriptions

3. Delete the “Subscriptions” key

4. Restart/Start the following services

“COM+ event system”
“COM+ System Application”
“Microsoft Software Shadow Copy Provider”
“Volume Shadow Copy”

5. Reboot the machine.

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