Dud tapes

[Dan Langille]

> On May 1, 2015, at 9:41 AM, Dan Langille <dan at langille.org> wrote:
> 
> 
> I'm using Bacula 7.0.5 on FreeBSD 10.1 (bacula-dir) and FreeBSD 9.3 (bacula-sd).
> 
> Sometimes I get dud tapes.  Or at least, tapes my tape drive does not like.
> 
> For example:
> 
> ###
> 01-May 09:39 crey-sd JobId 205441: End of Volume "FAI022" at 11:11326 on device "DTL03" (/dev/nsa0). Write of 64512 bytes got 49152.
> 01-May 09:39 crey-sd JobId 205441: Error: Error writing final EOF to tape. This Volume may not be readable.
> tape_dev.c:941 ioctl MTWEOF error on "DTL03" (/dev/nsa0). ERR=Input/output error.
> 01-May 09:39 crey-sd JobId 205441: End of medium on Volume "FAI022" Bytes=10,784,406,528 Blocks=167,168 at 01-May-2015 09:39.
> 01-May 09:39 crey-sd JobId 205441: 3307 Issuing autochanger "unload slot 2, drive 0" command.
> ###
> 
> See also, this from /var/log/messages:
> 
> ###
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). CDB: 10 00 00 00 01 00
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI Status Error
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check Condition
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM ERROR asc:c,0 (Write error)
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: 0x28b4b
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries exhausted
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). CDB: 10 00 00 00 02 00
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI Status Error
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check Condition
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM ERROR asc:c,0 (Write error)
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: 0x28b4b
> May  1 09:39:01 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries exhausted
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). CDB: 10 00 00 00 01 00
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI Status Error
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check Condition
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM ERROR asc:c,0 (Write error)
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: 0x11fb
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries exhausted
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). CDB: 10 00 00 00 02 00
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI Status Error
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check Condition
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM ERROR asc:c,0 (Write error)
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: 0x11fb
> May  1 09:42:41 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries exhausted
> ###
> 
> In this case, I will mark the tape as DISABLED and once it is past it's recycling date, I will retire the tape.
> 
> Best practice might be to rerun the backup, but this backup is also on disk.
> 
> What do you usually do with tapes such as this?  Is this tape or hardware?

I took one of these tapes and tried:

$ sudo tar -cf /dev/sa0 *
tar: Write error

It produced these errors:

May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). CDB: 10 00 00 00 02 00
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI Status Error
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check Condition
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM ERROR asc:c,0 (Write error)
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: 0xbac9
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries exhausted
May  7 21:37:10 knew kernel: (sa0:sym0:0:1:0): failed to write terminating filemark(s)

Is this a hardware problem?  A tape problem?

—
Dan Langille
http://langille.org/





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