This article is for Zmanda Recovery Manager For MySQL (ZRM)
BackupSet1:backup:WARNING: Snapshot failed BackupSet1:backup:WARNING: Could not read file /tmp/jVLTspNpUs BackupSet1:backup:WARNING: Unable to use snapshot
Error occurs due to some problem during snapshot creation. It may be because if no free physical extents available or due to some other reason.
To find out the exact reason for failing of snapshot run the following command as mysql user.
#mysql-zrm-backup --backup-set <YourBackupSetName> --lvm-snapshot <size> --verbose --backup-mode raw eg. mysql-zrm-backup --backup-set BackupSet1 --lvm-snapshot 10M --verbose --backup-mode raw
The command will do the backup using snapshot and logging will be verbose.
You can find the exact cause of failure of snapshot from the output above command.