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Date:      Fri, 15 May 2015 17:59:59 -0400
From:      Dan Langille <dan@langille.org>
To:        Don Lewis <truckman@FreeBSD.org>
Cc:        freebsd-scsi@FreeBSD.org
Subject:   Re: Dud tapes
Message-ID:  <BDAFE188-69BC-4FAD-904A-51C8C8A24521@langille.org>
In-Reply-To: <201505152107.t4FL73nP021839@gw.catspoiler.org>
References:  <201505152107.t4FL73nP021839@gw.catspoiler.org>

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> On May 15, 2015, at 5:07 PM, Don Lewis <truckman@FreeBSD.org> wrote:
>=20
> On 12 May, Dan Langille wrote:
>=20
>> The problem occurred today on another tape after writing just 313 MB:
>>=20
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). =
CDB: 10 00 00 00 01 00
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI =
Status Error
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check =
Condition
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM =
ERROR asc:c,0 (Write error)
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: =
0x1228
>> May 12 08:28:21 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries =
exhausted
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): WRITE FILEMARKS(6). =
CDB: 10 00 00 00 02 00
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): CAM status: SCSI =
Status Error
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): SCSI status: Check =
Condition
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): SCSI sense: MEDIUM =
ERROR asc:c,0 (Write error)
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): Command Specific Info: =
0x1228
>> May 12 08:28:22 knew kernel: (sa0:sym0:0:1:0): Error 5, Retries =
exhausted
>>=20
>> The tape before this took 111 GB, the tape after, took 791 MB (and =
then the backup completed).
>>=20
>> What do these errors mean? Does it indicate a dead tape?
>=20
> Bad tape, dirty or defective head, some sort of mechanical tape =
handling
> problem that affects the tape tension or movement, or less likely some
> other drive problem.  MEDIUM ERROR means that the drive couldn't write
> the bits to the tape and read them back correctly.

I have a bunch of new-to-me tapes.  So far, 5 out of 15 have resulted in =
that error.

=E2=80=94
Dan Langille
http://langille.org/






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