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Date:      Wed, 9 Aug 2000 09:03:36 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Matthew Jacob <mjacob@feral.com>
Cc:        Sam <freep@thecity.sfsu.edu>, freebsd-scsi@FreeBSD.ORG
Subject:   Re: "tape is now frozen"
Message-ID:  <20000809090336.F13974@wantadilla.lemis.com>
In-Reply-To: <Pine.BSF.4.10.10008072301320.86325-100000@beppo.feral.com>; from mjacob@feral.com on Mon, Aug 07, 2000 at 11:02:33PM -0700
References:  <NCBBJPDLBJCLBBFADHOMCEANDGAA.freep@thecity.sfsu.edu> <Pine.BSF.4.10.10008072301320.86325-100000@beppo.feral.com>

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On Monday,  7 August 2000 at 23:02:33 -0700, Matt Jacob wrote:
> On Mon, 7 Aug 2000, Sam wrote:
>
>> We are using a Tekram DC-315U with Tekram's 3.4 driver with an HP SureStore
>> DAT24i Internal SCSI drive, on a FreeBSD 3.5-STABLE. We can use 'dump' to
>> backup to the drive without errors, but when we try to use 'restore' we get
>> an 'Input/Output' error. We have tried multiple tapes with the same result.
>> Logs follow:
>>
>> [root@sol /]# restore -i -s 1 -f /dev/nrsa0
>> tape read error: Input/output error
>> [root@sol /]# tail /var/log/messages
>> [..removed..]
>> Aug  7 19:45:25 sol /kernel: (sa0:tekram_trm0:0:3:0): tape is now frozen-
>> use an OFFLINE, REWIND or MTEOM command to clear this state.
>> [root@sol /]# date
>> Mon  7 Aug 19:46:34 PDT 2000
>>
>> Any input would be greatly appreciated.
>
> Read the man page and follow what the message says. There was an I/O
> error that caused the device driver to not know the tape
> position. There should be some other error reported in the system.

Indeed, it looks like he omitted the message that we most wanted to
see.

Let me repeat here that I find this *very* irritating.  It happens,
for example, if I try to read a block which is too long.  There's no
way to know the length of a tape block in advance, so this is
relatively easy to get, particularly with DDS-4 drives, and it
involves a very slow recovery.  Why is this needed?

Greg
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