[Bacula-users] Corrupted Tape

I am having trouble restoring from tape. The last tape in my series has a problem with the label. The error I get from the console is:

02-Feb 19:04 maxwell-sd JobId 762: 3304 Issuing autochanger "load slot 1, drive 0" command.

02-Feb 19:04 maxwell-sd JobId 762: 3305 Autochanger "load slot 1, drive 0", status is OK.

02-Feb 19:04 maxwell-sd JobId 762: Error: block.c:275 Volume data error at 0:0! Wanted ID: "BB02", got "". Buffer discarded.

02-Feb 19:04 maxwell-sd JobId 762: Warning: acquire.c:260 Requested Volume "000183L1" on "Tape" (/dev/nst0) is not a Bacula labeled Volume, because: ERR=block.c:275 Volume data error at 0:0! Wanted ID: "BB02", got "". Buffer discarded.

02-Feb 19:04 maxwell-sd JobId 762: Please mount Volume "000183L1" for:

Job: RestoreFiles.2009-02-02_18.18.41.03

Storage: "Tape" (/dev/nst0)

Pool: Default

Media type: LTO-2

I was trying to see what output the ‘tapeinfo’ command would give me, and I believe it wrote to the front of the tape and destroyed the label. I believe the data on the tape should be mostly intact and I would like to relabel it without losing all of the data. I am currently restoring to a previous backup that doesn’t include that last tape, but it would be nice to be able to salvage the data. I was thinking that I could dd a label onto the front of the tape, but I do not know what a Bacula label looks like, nor what block size it is written in.

[root@maxwell tape_recover]# dd if=/dev/st0 of=testfile ibs=64k count=1

0+1 records in

0+1 records out

[root@maxwell tape_recover]# od -x testfile

0000000 002a 0000 005c 0000 0000 0000 0000 0000

0000020 0000 0000 0000 0000 0000 0000 0000 0000

0000040 0000 0000 0012 0000 0038

0000052

Does anyone have experience with recovering corrupt tapes? Any ideas on how to recover the tape would be appreciated.

S. Eric Clark

E-Mail: stephen.e.clark AT saic DOT com

SAIC

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