Frank,
I missed the beginning of this thread. Did it ever work?
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. 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.
A month later, a similar event occurred and the fix was equally
random. Strangely enough I replaced two AIT-2 drives with AIT-3 drives
last week and expected the worst. But they came up flawlessly.
In SCSI, the name of the game is:
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-) )
The only cables worse than SCSI were very old Thickwire ethernet.
On Wed, 4 Jun 2003, Frank Altpeter wrote:
> hi again,
>
> It seems that i don't have any time to celebrate any little success,
> since it doesn't take long time for the next problem to appear :-(
>
> Since some weeks i sometimes see SCSI errors in the system log file,
> like these:
>
> Jun 1 12:45:12 r2d2 kernel: scsi : aborting command due to timeout : pid
> 213591 32, scsi2, channel 0, id 0, lun 0 Inquiry 00 00 00 ff 00
>
> In the beginning, there was only scsidev 0,0,0 (the first of five
> LTO ultrium tape devices) that got the error.
> Because i assumed the error in the SCSI card, i disabled this drive
> until i can contact a StorageTek professional to check it.
>
> But now i see SCSI errors on all five tape devices. The tapes are
> distributed to three Tekram DC-390U3W cards.
> So i don't think that the cards are causing the errors, but i don't
> have any clue where to search now.
>
> Additionally to the above entry, i'm getting a lot of these now:
>
> Jun 4 08:40:30 r2d2 kernel: sym53c1010-33-0-<6,*>: target did not report
> SYNC.
> Jun 4 08:40:31 r2d2 kernel: scsi : aborting command due to timeout : pid
> 30973041, scsi5, channel 0, id 4, lun 0 Inquiry 00 00 00 f f 00
> Jun 4 08:40:31 r2d2 kernel: sym53c8xx_abort: pid=30973041
> serial_number=30972996 serial_number_at_timeout=30972996
>
>
> I know this is slightly off-topic, but it's a great problem for me,
> and btw. NetWorker of course refuses to work if a tape devices keeps
> hanging in the 'verifying label' state due to scsi timeouts...
>
> Well, to the hardware:
>
> 3 x Tekram DC-390 U3W Ultra 160 SCSI cards
> 5 x IBM LTO Ultrium drives, builtin to a StorageTek L700 tape library
> 1 x ASUS PR-DLSW Dual Intel Xeon-based motherboard
> 2 x Intel Xeon 2 GHz
> 1 x 1024 MB RAM
> 1 x Redhat Linux 7.3 (Valhalla)
>
> [root@r2d2 root]# cat /proc/scsi/scsi
> Attached devices:
> Host: scsi0 Channel: 00 Id: 05 Lun: 00
> Vendor: easyRAID Model: F8 Rev: 0001
> Type: Direct-Access ANSI SCSI revision: 03
> Host: scsi0 Channel: 00 Id: 06 Lun: 00
> Vendor: STK Model: L700 Rev: 0301
> Type: Medium Changer ANSI SCSI revision: 03
> Host: scsi2 Channel: 00 Id: 00 Lun: 00
> Vendor: IBM Model: ULTRIUM-TD1 Rev: 27Q1
> Type: Sequential-Access ANSI SCSI revision: 03
> Host: scsi2 Channel: 00 Id: 01 Lun: 00
> Vendor: IBM Model: ULTRIUM-TD1 Rev: 27Q1
> Type: Sequential-Access ANSI SCSI revision: 03
> Host: scsi2 Channel: 00 Id: 02 Lun: 00
> Vendor: IBM Model: ULTRIUM-TD1 Rev: 27Q1
> Type: Sequential-Access ANSI SCSI revision: 03
> Host: scsi5 Channel: 00 Id: 03 Lun: 00
> Vendor: IBM Model: ULTRIUM-TD1 Rev: 27Q1
> Type: Sequential-Access ANSI SCSI revision: 03
> Host: scsi5 Channel: 00 Id: 04 Lun: 00
> Vendor: IBM Model: ULTRIUM-TD1 Rev: 27Q1
> Type: Sequential-Access ANSI SCSI revision: 03
>
> With kind regards,
>
> Frank Altpeter
>
> --
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--
=============================================================
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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