Avoiding SCSI Transport Errors while Running Explorer/Extractor/Sccli with Sun Storage 3310 Arrays

(Doc ID 1003736.1)

Last updated on JANUARY 04, 2017

Applies to:

Sun Storage 3310 Array - Version Not Applicable and later
All Platforms

Symptoms

When an explorer, extractor, or sccli command is run on a host connected to a Sun Storage 3310 SCSI Array with I/O occurring to the array, in some configurations, we may see a long pause followed by bus resets. Bus resets cause the pending I/Os to be aborted, causing unnecessary command retries which may impact array performance.

The following is an example of the messages:

Dec  6 10:00:08 xyz scsi: [ID 107833 kern.warning] WARNING: /pci@1d,700000/pci@1/scsi@4/sd@0,1 (sd79):
Dec  6 10:00:08 xyz   SCSI transport failed: reason 'reset': retrying command
Dec  6 10:00:11 xyz scsi: [ID 107833 kern.warning] WARNING: /pci@1d,700000/pci@1/scsi@4/sd@0,1 (sd79):
Dec  6 10:00:11 xyz    Error for Command: write(10)    Error Level: Retryable
Dec  6 10:00:11 xyz scsi: [ID 107833 kern.notice]  Requested Block: 310860508                 Error Block: 310860508
Dec  6 10:00:11 xyz scsi: [ID 107833 kern.notice]  Vendor: SUN                                Serial Number: 6215C0B5-00
Dec  6 10:00:11 xyz scsi: [ID 107833 kern.notice]  Sense Key: Unit Attention
Dec  6 10:00:11 xyz scsi: [ID 107833 kern.notice]  ASC: 0x29 (power on, reset, or bus reset occurred), ASCQ: 0x0, FRU:0x0

Cause

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