[Networker] SCSI errors

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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