SCSI bus resets

From: Ray Pengelly (ray@biomed.queensu.ca)
Date: Wed Jan 21 2004 - 17:12:36 EST


I have a server running solaris 9 x86. It uses the AIC 7902w ultra 320 scsi
controller. This controller is dual channel. It has a 36 GB Seagate
ST336607LW on the A channel (internal) and an external storage array, and
L25 with one sdlt320 drive on channel B.

The internal drive is /dev/rdsk/c0t0d0

And has 3 partitions / s0

                                    /usr s6

                                    /opt s7

The external raid array has one array divided up into two 512GB LUNs which
are mounted as /DATA1 and /DATA2. They are /dev/rdsk/c2t0d0s6 and /c2t0d1s6.

I successfully created filesystems on the external array and mounted them.
They have nfs mounts and have been in use for about a week. Suddenly they
stopped working today. I found the following errors in /var/adm/messages

n 21 15:36:53 dmstore SCSI transport failed: reason 'reset': retrying
command

Jan 21 15:36:53 dmstore scsi: [ID 107833 kern.warning] WARNING:
/pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci9005,ffff@2,1/sd@0,0 (sd16):

Jan 21 15:36:53 dmstore SCSI transport failed: reason
'unexpected_bus_free': retrying command

Jan 21 15:37:28 dmstore adpu320: [ID 518805 kern.warning] WARNING: Timeout
on target 0 lun 0. Initiating recovery. Jan 21 15:37:30 dmstore scsi: [ID
107833 kern.warning] WARNING:
/pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci9005,ffff@2,1/sd@0,0 (sd16):

Jan 21 15:37:30 dmstore SCSI transport failed: reason 'reset':
retrying command

Jan 21 15:37:30 dmstore scsi: [ID 107833 kern.warning] WARNING:
/pci@0,0/pci8086,2545@3/pci8086,1460@1d/pci9005,ffff@2,1/sd@0,0 (sd16):

Jan 21 15:37:30 dmstore SCSI transport failed: reason
'unexpected_bus_free': retrying command

Any idea what could be causing this? If I try to mount to mount the drives I
get:

mount:/ I/O error

mount: cannot open /dev/dsk/c2t0d0s6

If I look at the disks under SMC both c2t0d0s6 and c2t0d1s6 show up but
their size is 0. Anyone have any clue what is going on?

Ray

Ray Pengelly

Computing Support Technologist

Centre for Neuroscience Studies/

CIHR Group in Sensory-Motor Systems

Queen's University

613-533-6000 ext 74139

Give a person a fish and you feed them for a day; teach that person to use
the Internet and they won't bother you for weeks.
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