I have had endless problems with backup Exec and our tape drive appearing offline.
I have followed all recommendations to get the the problem reloved. The problem goes away for a couple of days. then it comes back and the drive appears offline again. The error that does not go away is the one in the event log: Backup Exec cannot use this tape device because it has detected a mismatched tape device serial number. The device status has been changed to offline. Please restart all Backup Exec services to fix this problem
Sometimes the server witll just shtdown when the backup is started.
See below for all information and procedures followed up to date.
SEAGATE_DAT____DAT72-000A060
Backup Exec 11D Version 11.0 Rev 7170
Event ID 34113
Backup Exec Alert: Job Failed
(Server: "SERVER2003") (Job: "Inventory Drive 00028") Inventory Drive 00028 -- The job failed with the following error: Physical Volume Library Drive or Robot paused, offline, or disabled.
Event ID 58053
Backup Exec Alert: Device Error
(Server: "SERVER2003") Backup Exec cannot use this tape device because it has detected a mismatched tape device serial number. The device status has been changed to offline. Please restart all Backup Exec services to fix this problem.
Start removable storage service.
Goto Computer Management->removable storage->libraries
Deleted the entries for tape drives.
Restart the removable storage service.
Check that new entries for tape drives came back.
Disable removable storage service.
-Disable library from backupexec and delete it.
-Restart backupexec services
