[7319] in linux-scsi channel archive
Re: problems with scsi tape on Adaptec/Tekram host (solved)
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Mon Oct 4 14:01:08 1999
To: linux-scsi@vger.rutgers.edu
From: Marc SCHAEFER <schaefer@alphanet.ch>
Date: 4 Oct 1999 19:32:28 +0200
Message-ID: <7taobc$f65$1@vulcan.alphanet.ch>
Roland Boden <Roland_Boden@activelink.de> wrote:
> I checked again and found that the non-disconnect-capable tape drive on one scsi-host does not
> interfere with the devices on the other host. Only when hd and tape is on the same host I get a
That's normal. If disconnection is disabled on a host adapter, it means
all other devices on the _same bus_ (ie on the same host adapter if
it has one channel) will be locked until the operation finishes.
e.g. a mt retension operation on a tape drive with a non-disconnect capable
tape drive OR a misconfigured host adapter (with disconnects disabled)
will make the other devices on the bus wait as long as needed (e.g. 10
minutes or more for a retension on slow devices). This will cause bus
resets, retries, and otherwise unreliable operation.
To solve the problem, either enable host adapter or driver disconnection,
buy a tape drive which is capable of disconnecting, or put the tape drive
alone on an old laying around controller.
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