rman backup using Oracle Secure Backup fails with: sbtclose2: Internal error - NDMP Data Service has exited prematurely. (Doc ID 1329807.1)

In this example, OSB is configured using a tape library with 2 drives.

Rman backup to tape fails with:
RMAN-03009: failure of backup command on c1 channel at 05/31/2011 08:06:12
ORA-27192: skgfcls: sbtclose2 returned error - failed to close file
ORA-19511: Error received from media manager layer, error text:
sbtclose2: Internal error - NDMP Data Service has exited prematurely.
For more information, please check the transcript for this job ('oraprod/58.1').
ORA-27000: skgfqsbi: failed to initialize storage subsystem (SBT) layer
Additional information: 1294

From transcript:
ob> catxcr -l0 oraprod/58.1
...
2011/05/31.08:01:06 (mt) qdv__read_label() of 65536 bytes failed - mode parameters changed (OB scsi device driver)
2011/05/31.08:01:06 (atv) local mount failed - mode parameters changed (OB scsi device driver)
2011/05/31.08:01:06 ***0 wst__close: wh=0x0

...

08:05:46 NWEM: saw tape write error log message ("tape write failed due to media error")
tape write failed due to media error
08:05:46 MNPO: mover halted with reason=internal error
08:05:46 QTOS: received osb_stats message for job oraprod/58.1, kbytes 28896768, nfiles 0
08:05:46 MGS: ms.record_size 65536, ms.record_num 0x6E3B8, ms.bytes_moved 0x6E3B80000
08:05:46 MNPO: data service halted with reason=successful

From dumpdev:
ob> dumpdev <tape drive>
...
Tue May 31, 2011 at 08:01:06.711 (WIT) devtype: 6
obexec: /dev/obt1, args to wst__exec: handle=0x0
accessed via host B
op=7 (readpos), buf=0xffffffff7fffc990, count=20 (0x14), parm=0x00
cdb: 34 00 00 00 00 00 00 00 00 00 read_pos
sense data:
70 00 06 00 00 00 00 10 00 00 00 00 2A 01 00 00 94 0A 00 00 00 00 00 00
ec=0, sk=unit attn, asc=2A, ascq=1
error is: mode parameters changed
flags: (none)
returned status: code=mode parameters changed,
resid=0 (0x0), checks=0x1 [attention]

The data from dumpdev, for the drive used in the failed backup, shows that the drive reported a
"unit attention" with the error "mode parameters changed"

This error is defined as:
"The Mode parameters for the drive have been changed by a host other than the one issuing the command.
"UNIT ATTENTION" is set for all hosts following a "MODE SELECT" command, apart from the host that issued the command. This code will only be returned in a multi-host environment."

What the error is telling us is that some other application/host is accessing the tape drive while OSB is using it.

Changes

Several tape libraries and drives have been added to the OSB administrative domain.

Cause

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