Backup to tape library fails with a 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED' error. (4038224)

Backup to tape library fails with a 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED' error.

Backups fail due to the tape library going offline.

NetVault Backup Environment Details...
NetVault Server: 8.5.3 Windows 2003.
Backup Device: Overland NEO 2000 tape library attached via FC to a NetApp Filer (OnTap 8.1.2P3 7-Mode).
Plugin: installed the NDMP 7.6.11 with the NDMP 5.7.5 Consolidation Patch to support the OnTap 8.x Filer Operating System.

Please Note: That NetVault Backup 8.5.x and 8.6.x are no longer supported after end of January 2015. Further details can be found on the following link under the Support Policies & PLC sub tab:

https://support.quest.com/netvault-backup/9.2

The following errors were within the NetVault logs:

1] Information   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: NORMAL 190: DUMP: Tape write failed.
2] Information   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: NORMAL 191: DUMP: DUMP IS ABORTED
3] Error   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: ERROR 192: DATA: Backup terminated: EVENT: I/O ERROR (for /vol/vol_data/.snapshot/nightly.0)
4] Error   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   Data operation halted due to unrecoverable internal NDMP server error
5] Error   2014/02/24 06:59:35   189   Media   WTH-BCK2   WTH-BCK2 Tape wth-fas2240:nrst0a (IBM ULTRIUM-TD6): had transfer aborted

With sub text:
SCSI    :07496   16       0  65934 CMD STATUS 'CHECK CONDITION' [2]
SCSI    :07496   17       0  65934 CMD SENSE KEY 'UNIT ATTENTION   ' [6] - ASC 29 ASCQ 00
SCSI    :07496   18       0  65934 CMD SENSE INFO 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED'
SCSI    :07496   20       0  65934 CMD RETURN VALUE 2
SCSI    :07496   14       0  65934 CMD TEST UNIT READY [ 00 00 00 00 00 00  ]
CAMNDMP :07496  157       0  65934 CMD 00 00 00 00 00 00

6] Error   2014/02/24 06:59:35   189   Jobs   WTH-BCK2   Job Status: Backup Failed

These are external SCSI messages relayed to NVBU i.e. is an issue outside of NVBU and advise to contact your hardware vendor to test everything from the NetVault Server to the Filer and to the tape library (FC Cards, FC cables, FC Switches, HBA firmware, tape library, drives, tape library firmware, drive firmware, Filer and motherboards where the FC cards are inserted to. The same applies to SCSI connectivity).

If anything is replaced, upgraded or re-attached, then you always have to remove the tape library within NetVault Device Management, reboot the NetVault Server, re-add the tape library within NetVault Device Management so that a new NDMP channel to the tape library is created.

Note: The tape library engineer needs to perform tests from the NetVault Server and not just plugging in a laptop into the tape library, as all the communication from the NetVault Server to the tape library and everything in between needs to be tested.