Cluster shared volumes timeout (Hyper-V with VSS)
The default is 180 (wait for 3 hours). A wait of 3 hours is recommended if you have multiple virtual machines on one CSV.
If you do not want NetBackup to wait for another backup to release the shared volume, set the value to 0. If at the same time another cluster node backs up a shared volume that this backup requires, the backup fails with status 156.
The appropriate value for this timeout parameter depends on the following factors:
The average backup job duration for the virtual machines that reside on the same CSV. The job duration depends on the size of the virtual machines and the I/O speed.
The number of virtual machines on the same CSV.
More information is available on NetBackup support for the virtual machines that use CSVs.
See About virtual machines on Windows 2012 and 2016 failover clusters.