[Networker] SCSI bus resets????!!!

Hi,

First, if someone can suggest a better site that I could get help onthis issue from, please let me know. LSI, Storagetek, Legato, andQuantum have been unable to resolve this thus far. Everyone seems tothink the problem is not on their end.

Our Linux RedHat storage node host (Dell powerEdge 6600) generates SCSIbus reset messages in the system log almost daily (different times) forthe library picker or more specifically for the scsi id being used bythe robot. Is it possible that too many groups running could cause thisor maybe something isn't configured properly in Legato? From the looksof the messages, his just doesn't appear to be a Legato NetWorker problem.

I was labeling some tapes last night, nothing else going on, andsuddenly it just hangs. Sure enough, another SCSI bus reset reported forthe picker. We've had Storagetek replace the robotic controller card inthe library and the internal SCSI cable, and it's still occurring. We'reusing LVD tape libraries (STL L80 w/ 4 LTO-1 drives) and P1000 SDLT w/2SDLT-1 drives).

We tried replacing cards, SCSI cables, moving cards to different PCIslots in the hosts, different servers, different drivers, etc. Still,same problem. We were having a similar problem with Adaptec 39160s so weswitched to LSI.

We're using LSI-22320-R dual channel 320 cards. I've seen this occursometimes also on our Quantum library. Quantum says that Raid controllercards can cause problems for pickers, but LSI says this card should workfine. It has RAID 0 and 1 (striping and mirroring) capabilities, but itshould otherwise function just like any LVD/SE card. We've notconfigured these cards to do any RAID stuff. There is no option,however, to specifically turn it off. There are various speeds that canbe set on all the devices on each channel. The default (highest) is 320,but you can go down to lower speeds, e.g. 160, 80, 40, 20, all the waydown to 'ASYNC'. I've tried different speeds on the picker, down to 80so far. I would think the devices would auto negotiate, anyway. Thepicker is on its own channel at id 0. The drives are on their ownchannels at ids 2,3,4 and 5. Should the picker be at a lower speed,maybe even ASYNC? Maybe I should try changing the picker to a higher IDlike 6 or 8?

Dec 23 15:01:31 santana kernel: scsi : aborting command due to timeout :pid 78695, scsi2, channel 0, id 0, lun 0 Move medium/play audio(12) 0000 00 01 f5 04 1c 00 00 00 00Dec 23 15:01:31 snode1 kernel: mptscsih: ioc0: id=0 OldAbort: schedulingABORT SCSI IO (sc=f6111200)

Dec 23 15:01:31 snode1 kernel: mptbase: Initiating ioc0 recovery

Dec 23 15:01:32 snode1 kernel: SCSI host 2 abort (pid 78695) timed out -resetting

Dec 23 15:01:32 snode1 kernel: SCSI bus is being reset for host 2 channel 0.


Thanks.

George

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