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.

 

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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