Error run into while backing up RHV virtual machines

The following table describes the problem that might occur when you back up RHV virtual machines:

Table: Error while backing up RHV virtual machines

Error message or cause	Explanation and recommended action
After a NetBackup backup operation, the VM snapshot on the RHV manager is not deleted.	If a disk attached to the VM is in an inactive state, then the RHV manager does not delete the VM snapshot after a backup operation is complete. Workaround: Before the backup operation, verify the state of the disks that are attached to the VM and ensure that they are active. Ensure that the disks are not attached while the VM is running, thus preventing the disk to be in an inactive state.
VM backup fails with the following error: "The virtual machine has no disks or contains only Raw Device Mappings for disks: Status 25"	This temporary error might occur when the VM snapshot is not available for the backup operation. The backup job is successful on the second attempt.
Unable to remove the older snapshots from the RHV manager when the disk is in a locked state. The following error is displayed: A NetBackup snapshot of the virtual machine exist.	Workaround: Refer to the following article for steps to unlock the disk: https://access.redhat.com/solutions/396753 Manually remove the older snapshots from RHV manager.
Accelerator option does not work.	When a backup policy is created using APIs and the use Accelerator option is enabled, the policy gets created but the NetBackup Accelerator feature does not work. NetBackup Accelerator is not supported for RHV.