ARC not growing, even there is plenty of freemem

(Doc ID 2328833.1)

Last updated on DECEMBER 19, 2017

Applies to:

Solaris Operating System - Version 10 3/05 to 10 1/13 U11 [Release 10.0]
Information in this document applies to any platform.

Symptoms

 

System is seeing very poor ZFS I/O performance.

Nothing is set in /etc/system file, like zfs_arc_max or zfs_arc_min.

Enough free memory  can be seen by memstat:

 

Which essentially means there is 52GB of RAM which is unusable, even ZFS ARC tries to stay above swapfs_minfree

 

 

 

 

Changes

 

Cause

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