Attempting to perform a Export or Virtual Standby to a Hyper-V CSV (Cluster Shared Volume) gives a Warning in Virtual Machine Export Wizard, and the jobs fails with the same error:
"Unable to calculate the space required to export the VM onto a cluster shared volume"
This has been identified as a defect, RR-106698.
The Rapid Recovery AAFileFilter driver is unable to attach to Hyper-V CSV storage with ReFS FS, properly.
Causing the CSV to go from status 'Online' to 'Online (Redirected Access)'. This can be seen from Windows Failover Cluster Manager, as per below example.
While the CSV is in 'Redirected Access' state, it's not possible to Export to the disk causing the Export/Virtual Standby job to fail.
There is currently no fix available for this issue. This defect will be resolved in a future release of Rapid Recovery.
1. Uninstall the Rapid Recovery Agent on the Hyper-V server.
This will stop the AAFileFilter driver from forcing the CSV into a 'Redirected Access' state. This will allow for Export to the CSV in state 'Online'
2. Perform Export to CSV with NTFS filesystem, rather than ReFS FS.
3. Go to HKEY_LOCAL_MACHINE\SOFTWARE\AppRecovery\Core\Exports and set SkipFreeSpaceCheck to 1. This will let you bypass the free space check.
For further information, please contact Technical Support for further assistance.