Snapshot status errors

There are certain snapshot commands like mmdelsnapshot and mmrestorefs, which lets snapshot go invalid if they got interrupted while running.

Some snapshot commands like mmdelsnapshot and mmrestorefs may require a substantial amount of time to complete. If the command is interrupted, say by the user or due to a failure, the snapshot may be left in an invalid state. In many cases, the command must be completed before other snapshot commands are allowed to run. The source of the error may be determined from the error message, the command description, or the snapshot status available from mmlssnapshot.