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Backup or replication of a Hyper-V VM fails. In the Windows event logs on the Hyper-V host server, there is an error with ID 8193 from source VSS: Volume Shadow Copy Service error: Unexpected error calling routine Cannot find anymore diff area candidates for volume \\?\Volume{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx}\ [0]. Note: This KB specifically addresses the error “cannot find anymore diff area candidates for volume.” There are a variety of possible VSS errors with ID 8193. Veeam Backup & Replication reports a general error about snapshot creation failure: Unable to create snapshot (Microsoft Software Shadow Copy provider 1.0) (mode: Crash consistent). Details: Unknown status of async operation The shadow copy provider had an unexpected error while trying to process the specified operation. --tr:Failed to create VSS snapshot. --tr:Failed to perform pre-backup tasks.
The Volume Shadow Copy Service is unable to allocate disk space to create a shadow copy because the maximum size of the shadow storage area is too small.
Increase the shadow copy storage area for the volume listed in the error event, or set the maximum size to “No limit.” To identify the volume listed in the event, run “mountvol” from a command prompt; below the usage information will be a list of volume GUIDs and their associated mount points, if any.This size of the shadow storage area can be changed in the Shadow Copies utility, or from the command line.Note: By default, each volume stores its own shadow copy. For example, a shadow copy of a CSV mapped to C:\ClusterStorage\Volume8 would also be stored on C:\ClusterStorage\Volume8. Do not change the location of the shadow copy storage area on a Hyper-V host server. Shadow Copies Utility To access the utility, right click any volume and choose Configure Shadow Copies. In the Shadow Copies utility: Select the volume with insufficient space; Click Settings… In the “Maximum size” box, either increase the limit, or choose “No limit”.
It is not necessary to enable shadow copies for shared folders. “Next Run Time” should show “Disabled.”
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