I have a VM that I couldn't delete snapshots for because they were locked. The snapshot manager didn't show any snapshots so they had to be deleted from the data store. I powered down the backup virtual appliance and deleted the snapshots. Now when I try to power up my backup appliance, it said "Failed to lock file" and it doesn't start:
Cannot open the disk '/vmfs/volumes/4f9219d8-8911a550-fabd-001cc45d593c/[servername]/[servername].vmdk' or one of the snapshot disks it depends on.