Unexplained ZFS performance issues after upgrading to certain versions of Solaris 10 update 11.

(Doc ID 1925088.1)

Last updated on JULY 29, 2016

Applies to:

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

Symptoms

Typically the guds data is collected when the performance issue is occurring. However, analysis of the data doesn't show any outstanding issues nor bottlenecks but it has been observed that applications seem to be running much slower than before the upgrade. The whole system is not affected, just applications that are disk IO intensive.  

Changes

 Customer has recently applied zfs patch 150125-03 (sparc) or 149637-03 (x86) or upgraded to 150400-03 or 150401-03 or better but before 150400-13 or 150401-13.

Cause

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