Servers running Solaris 10u11 or 11.x with Large Amounts of Physical Memory and Small ZFS ARC Caps May Encounter IO Performance Issues

(Doc ID 2200972.1)

Last updated on JULY 07, 2017

Applies to:

Solaris Operating System - Version 10 1/13 U11 and later
Information in this document applies to any platform.

Symptoms

Should the issue described in this document be encountered, collecting GUDS with the -X3 option will show the following:

For bare metal systems or Control/IO Domains:

# ./guds -q -c60 -i1 -n5 -w0 -X3 -T -r -H0 -s<SR#> -d "Slow IO Performance"

For Guest LDOMs:

# ./guds -q -c60 -i1 -n5 -w0 -X3 -T -M -r -H0 -s<SR#> -d "Slow IO Performance"

 

iostat shows a read-biased workload.  The disk service times (asvc_t) are good with no IOs queued (wait) in the driver

 

Changes

Applying the Solaris 10 Recommended Patchset (10_Recommended) that contains 150400-37/150401-37 or updating to Solaris 11.3 SRU 3.6 or later

Cause

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