ADSM-L

Re: Strange SCSI adapter failure with AIT drives

2001-02-28 07:40:00
Subject: Re: Strange SCSI adapter failure with AIT drives
From: Tom Tann{s <tom.tannas AT USIT.UIO DOT NO>
Date: Wed, 28 Feb 2001 13:40:28 +0100
We had similar problems for several months.
After upgrading the drives to 1.08 the problems were gone.

On Wed, 28 Feb 2001, Jochen Strohbeck wrote:

> Hi,
>
> we observed a problem related to TDSM and SONY AIT drives. Sometimes we
> get the following error message on a Solaris connected to a tape
> library:
>
> ANR8302E I/O error on drive DRIVE01 (/dev/rmt/0mt) (OP=READ, CC=205,
> KEY=FF, ASC=FF, ASCQ=FF, SENSE=**NONE**, Description=SCSI adapter
> failure).
>
> We had three engineers from Sony here to check the situation. First we
> thought that the problem is related to SCSI and we attached a SCSI
> analyzer to log the bus activities.
>
> We were lucky to catch the situation when the error occured. In the
> trace we saw that in a DATA_IN_PHASE (= host READ) the AIT drive
> suddenly sets all SCSI signals inactive. The SONY engineers said that
> this is caused by a HW reset due to weak power supply. So we built in
> better power supplies but the problem is still there.
>
> In one case we were able to reproduce the problem with one special tape.
> But when we put the tape in another drive everything works fine. So I
> think that there might be a problem when a tape is written in one drive
> and read in another drive.
>
> >From my point of view there is a problem reading the media. Several
> times we observed that the AIT makes several retries to read data from
> the tape. Maybe this leads to a SCSI command timeout and the error
> message above.
>
> Has anyone similar problems? Any suggestions? I've heard that there is a
> new firmware 1.08 for the AIT drives but we havn't got anything from our
> disti.
>
> Thanks,
>
> Jochen Strohbeck
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