SCSI timeout errors when using external disk pack

From: Andy Malato (andym@oak.njit.edu)
Date: Wed Dec 01 2004 - 17:26:06 EST


System setup is an E450 running Solaris 9 kernel patch 117171-07.

The system has 4 internal 4.2GB disks (Model: DDRS-34560) and an
external SPARCstorage MultiPack 2 with 4 of those same drives, used for
mirroring the internal drives.

The problem seems to be with the external disk pack as the problem goes
away when the MultiPack is removed. Every so often the following messages
appear in /var/adm/messages.

        WARNING: /pci@1f,4000/scsi@2 (glm1):
                Connected command timeout for Target 2.0
        WARNING: /pci@1f,4000/scsi@2 (glm1):
                Target 2 reducing sync. transfer rate
        WARNING: /pci@1f,4000/scsi@2 (glm1):
                got SCSI bus reset
        WARNING: /pci@1f,4000/scsi@2/sd@2,0 (sd17):
                SCSI transport failed: reason 'timeout': retrying command

The above messages show connection timeout problems for Target 2.0, but a
similar message has also been logged for Target 8.0.

The disk drives for target 2 and 8 have been replaced along with the scsi
cable connecting the MultiPack to the E450. In addition, a different
MultiPack was used, but the above problem still occurs. The MultiPack is self
terminating, and does not require the use of a terminator, however a
terminator was placed on the back of the MultiPack to see if the problem
was a result of the MultiPack not terminating itself correctly, but again,
this did not prove effective.

Hopefully someone has seen a situation like this before and can provide
insight into solving the above problem.

Thanks for any help that one can provide.

        ---Andy
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