Networker

Re: [Networker] SCSI errors (What cards supported for Linux?)

2003-07-22 09:50:01
Subject: Re: [Networker] SCSI errors (What cards supported for Linux?)
From: Matthew Temple <mht AT RESEARCH.DFCI.HARVARD DOT EDU>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Tue, 22 Jul 2003 09:39:55 -0400
With reference to the conversation below, we're still getting
strange SCSI related errors on our machine.   Strangely, the
problems only seem to occur when an tape is being labeled
by auto-media-management.   I can label normally when  no
backup is in progress.   If a backup is in progress, the tape
will (can) go into a permanent verify state, or stranger,
seems to be trying to eject nad load at the same time.   The robot
arm of the Qualstar library "clunks" for a very long time.   (I can
eject the tape through the Qualstar Console -- it ejects, gets put
back into its slot, then Networker remounts the tape and can't eject
it!   Is there a list of supported SCSI cards for Linux anywhere?


On Thu, 5 Jun 2003, Frank Altpeter wrote:

>
> Hello!
>
> Matthew Temple wrote on 2003-06-04 16:01:03 -0400:
> >
> > Frank,
> >
> >     I missed the beginning of this thread.   Did it ever work?
> Oh, yes, it works, but not all the time...  It happens sometimes
> that the mentioned errors occur, but not permanently. Last night for
> example the backup processes were running fine without any error.
>
>
> >     I've had similar problems on two extended occasions with a
> > Qualstar library and three sony AIT-2 drives.   The card is an adaptec
> > (I'm not near the machine) 2940U2.   The first time occurred after a move.
> > The tape in the library, would go into a hung state when trying to verify
> > label.
> ACK, same was here.
>
> >   first it was all three drives.   Then I messed around with
> > termination and changed the scsi cable and the problem reverted to
> > just one drive. -- SCSI resets and timeouts.   Then I switched
> > SCSI cards (same card, just a different one.)   I took a DDS tape drive
> > off the internal channel.   Same result.   Then I reattached the
> > internal tape drive.   Everything worked.   I don't know why.
> > It was all so ... SCSI.   SCSI cables have always been mysterious to me --
> > we've had RAID stacks that worked when their cable was curved to the left
> > but now when curved to the right.
>
> You don't want to know how often i changed the cabeling on my system
> the last weeks :-))
>
> >     1. Keep the cables as short as possible.
> >     2. Is everything REALLY terminated correctly (how about
> >             the jumpers on the devices?  TERM-POWER?)
> >     3. Try different cable positions.
> >     4. The following is MOSTLY true -- It's probably NOT your card.
> >                     (except when it is 8-)   )
> Yep, and i think that i used to work according to these rules... we
> checked cables and termination more than a dozen times these days,
> but it's hard to check for me when it comes to hardware - i'm more
> the software guy ...
>
> With kind regards,
>
>       Frank Altpeter
>

--
=============================================================
Matthew Temple                Tel:    617/632-2597
Director, Research Computing  Fax:    617/582-7820
Dana-Farber Cancer Institute  mht AT research.dfci.harvard DOT edu
44 Binney Street,  ML105      http://research.dfci.harvard.edu
Boston, MA 02115              Choice is the Choice!

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