FS System: FS1-2 May Record DWORD Errors on a Faulty SAS Link.

Asset ID:	1-72-2167242.1
Update Date:	2018-01-03
Keywords:

Solution Type Problem Resolution Sure

Solution 2167242.1 : FS System: FS1-2 May Record DWORD Errors on a Faulty SAS Link.

Applies to:

Oracle FS1-2 Flash Storage System - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Serial Attached SCSI (SAS) link errors are logged by a Controller. These are observed following the scanlog6 processing of the system log bundle.

Link error example:

dl_pmcIombRcvSasHwEventProcess PSG_PI PSG_PI_IC "CTRL[0] Port[2] PHY[10] SAS HW event=0x12"

event=0x12 indicates that the error is of type PDG_DL_PM8018_HW_EVENT_PHY_ERR_INVALID_DWORD which is an error decoding the DWORD

Multiple entries may also be recorded in a single day, which would justify further investigation.

Example command:

grep "SAS HW event" output-1459726141816915402-1460002299735613382-0.txt | grep "2016-04-07T04:10" | wc -l

Cause

The cause is a faulted or 'marginal' component on the SAS link. The link remains online but DWORD (line encoding) errors are recorded by the SAS HBA port.

Solution

If there are multiple entries of this event type identified on the system, SA link components will require replacement.

The suggested order would be:

SAS cable(s)
SAS HBA
SAS component on end of this link (eg DE IOM or SAS HBA depending on the link use).

The CTRL and Port details will identify the appropriate SAS HBA port locations. Reference the topology output in conjunction with this document: FS System: How to Read and Interpret the FS1-2 CLI Topology Command (Doc ID 1970990.1)

In the example "dl_pmcIombRcvSasHwEventProcess PSG_PI PSG_PI_IC "CTRL[0] Port[2] PHY[10] SAS HW event=0x12" this translates to HBA 0, Port 2 which is a Controller<>Controller SAS link.

Change request 23072999 should provide some automation / detection of ongoing DWORD errors - PI should monitor SAS Dword/ITW errors - fixed in 6.3.0

References

<BUG:23072999> - ASSIST TSC: BS PANIC DUE TO TIMEOUT

Attachments

This solution has no attachment