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iostat H/W Errors Increment for Multipathed Disks due to "SCSI Sense Key: Unit_Attention ASC: 0x2a (parameters changed), ASCQ: 0x0" when ZFS Modifies the Write Cache Mode (Doc ID 1551633.1)

Last updated on NOVEMBER 02, 2017

Applies to:

SPARC T4-2 - Version All Versions to All Versions [Release All Releases]
Solaris Operating System - Version 10 1/13 U11 to 11.2 [Release 10.0 to 11.0]
Information in this document applies to any platform.

Symptoms

The iostat H/W Errors Increment for Multipathed Disks due to "SCSI Sense Key: Unit_Attention ASC: 0x2a (parameters changed), ASCQ: 0x0" when ZFS Modifies the Write Cache Mode.

% iostat -en
  ---- errors ---
  s/w h/w trn tot device
    0   2   0   2 c0t60060E800561CF00000061CF00000059d0
    0   3   0   3 c0t60060E800561CF00000061CF00000058d0
    0   3   0   3 c0t60060E800561CF00000061CF00000057d0
    0   3   0   3 c0t60060E800561CF00000061CF00000056d0
    0   3   0   3 c0t60060E800561CF00000061CF00000055d0
    0   3   0   3 c0t60060E800561CF00000061CF00000054d0
    0   3   0   3 c0t60060E800561CF00000061CF00000053d0
    0   3   0   3 c0t60060E800561CF00000061CF00000052d0
    0   2   0   2 c0t60060E800561CF00000061CF00000051d0
    0   1   0   1 c0t60060E800561CF00000061CF00000050d0

Example messages:

Apr 26 21:40:20 host scsi: [ID 107833 kern.warning] WARNING: /scsi_vhci/ssd@g60060e800561cf00000061cf00000051 (ssd28):
Apr 26 21:40:20 host Error for Command: read(10)                Error Level: Retryable
Apr 26 21:40:20 host scsi: [ID 107833 kern.notice] Requested Block: 8448                      Error Block: 8448
Apr 26 21:40:20 host scsi: [ID 107833 kern.notice] Vendor: HITACHI                            Serial Number: 50 061CF0051
Apr 26 21:40:20 host scsi: [ID 107833 kern.notice] Sense Key: Unit_Attention
Apr 26 21:40:20 host scsi: [ID 107833 kern.notice] ASC: 0x2a (parameters changed), ASCQ: 0x0, FRU: 0x0

Example FMA events:

% fmdump -eV -t "04/26/13 21:40" -T "04/26/13 21:41" -n "devid = id1,ssd@n60060e800561cf00000061cf00000051"
TIME                           CLASS
Apr 26 2013 21:40:20.035801936 ereport.io.scsi.cmd.disk.dev.rqs.derr
nvlist version: 0
        class = ereport.io.scsi.cmd.disk.dev.rqs.derr
        ena = 0x29def6b388c0e001
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = dev
                cna_dev = 0x517ad01b00000053
                device-path = /pci@400/pci@2/pci@0/pci@a/SUNW,qlc@0,1/fp@0,0/ssd@w50060e800561cf10,1
                devid = id1,ssd@n60060e800561cf00000061cf00000051
        (end detector)

        devid = id1,ssd@n60060e800561cf00000061cf00000051
        driver-assessment = retry
        op-code = 0x28
        cdb = 0x28 0x0 0x0 0x0 0x1 0x20 0x0 0x0 0xe0 0x0
        pkt-reason = 0x0
        pkt-state = 0x3f
        pkt-stats = 0x0
        stat-code = 0x2
        key = 0x6
        asc = 0x2a
        ascq = 0x0
        sense-data = 0x70 0x0 0x6 0x0 0x0 0x0 0x0 0x58 0x0 0x0 0x0 0x0 0x2a 0x0 0x0 0x0 0x0 0x0 0x28 0x80
        __ttl = 0x1
        __tod = 0x517ae634 0x2224b50

Apr 26 2013 21:40:20.130640012 ereport.io.scsi.cmd.disk.dev.rqs.derr
nvlist version: 0
        class = ereport.io.scsi.cmd.disk.dev.rqs.derr
        ena = 0x29def6b388c0e005
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = dev
                cna_dev = 0x517ad01b00000053
                device-path = /pci@400/pci@2/pci@0/pci@a/SUNW,qlc@0/fp@0,0/ssd@w50060e800561cf00,1
                devid = id1,ssd@n60060e800561cf00000061cf00000051
        (end detector)

        devid = id1,ssd@n60060e800561cf00000061cf00000051
        driver-assessment = retry
        op-code = 0x28
        cdb = 0x28 0x0 0x0 0x0 0x1 0x20 0x0 0x0 0xe0 0x0
        pkt-reason = 0x0
        pkt-state = 0x3f
        pkt-stats = 0x0
        stat-code = 0x2
        key = 0x6
        asc = 0x2a
        ascq = 0x0
        sense-data = 0x70 0x0 0x6 0x0 0x0 0x0 0x0 0x58 0x0 0x0 0x0 0x0 0x2a 0x0 0x0 0x0 0x0 0x0 0x28 0x80
        __ttl = 0x1
        __tod = 0x517ae634 0x7c9688c

Apr 26 2013 21:40:20.230473769 ereport.io.scsi.cmd.disk.recovered
nvlist version: 0
        class = ereport.io.scsi.cmd.disk.recovered
        ena = 0x29def6b388c0e009
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = dev
                cna_dev = 0x517ad01b00000053
                device-path = /pci@400/pci@2/pci@0/pci@a/SUNW,qlc@0,1/fp@0,0/ssd@w50060e800561cf10,1
                devid = id1,ssd@n60060e800561cf00000061cf00000051
        (end detector)

        devid = id1,ssd@n60060e800561cf00000061cf00000051
        driver-assessment = recovered
        op-code = 0x28
        cdb = 0x28 0x0 0x0 0x0 0x1 0x20 0x0 0x0 0xe0 0x0
        pkt-reason = 0x0
        pkt-state = 0x1f
        pkt-stats = 0x0
        __ttl = 0x1
        __tod = 0x517ae634 0xdbcc029

Another related symptom reported is Oracle Explorer run on Solaris host without flush write cache disabled may trigger the logging of many 1513 and 1517 errors on EMC VMAX storage. EMC reported the errors seen on the Symmetrix storage do not cause any known impact beyond filling the error buffer.

7C.1513.10 Indicates a MODE SELECT (SCSI CMD 15) issued by the host tried to change a non-changeable parameter.
7C.1517.00 Indicates reason MODE SELECT (SCSI CMD 15) failed with Sense Key = 05 (ILLEGAL REQUEST).

 

Changes

This change in behavior was introduced by the fix for
<Bug 15588234> : SUNBT6880334 zpool destroy does not disable the write cache on a disk drive, which was integrated into Solaris 11 GA and the following Solaris 10 patches:

<Patch 147147-26> Synopsis: SunOS 5.10: kernel patch
<Patch 147148-26> Synopsis: SunOS 5.10_x86: kernel patch

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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