Check Condition, Unit Attention, ASC: 0x3f for Read 10 Messages Produces IO Performance Issue
Last updated on APRIL 04, 2016
Applies to:Sun Storage 9980 System - Version Not Applicable and later
Solaris (SPARC) - Version 10 and later
Sun Storage 9970 System - Version All Versions and later
Sun Storage 9985 System - Version All Versions and later
Sun Storage 9990 System - Version All Versions and later
Information in this document applies to any platform.
There is a IO performance issue in the server which is connected to HDS Array.
The performance degradation happens sometimes for 5 minutes sometimes for 20 minutes and after that everything back to normal.
Below are our observations:
• Each time suffer a performance degradation, there are +600 scsi: [ID 1078 kern.warning] Retryable errors logged on hosts.
• The errors are generated on all active LUNs cross all 4 paths toward 4 different Storage ports
• It was found that each time when we add new LUNs to this cluster, it will trigger a rescan on the host and it seems rescan generated these Retryable errors
• These Retryable [ID 107833 kern.warning] errors cause 30 to 50% I/O drops
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