Maximum size of ZFS ARC is incorrectly initialized

(Doc ID 1908088.1)

Last updated on JANUARY 06, 2018

Applies to:

Solaris Operating System - Version 11.1 and later
Solaris x64/x86 Operating System - Version 11.1 and later
Information in this document applies to any platform.
*** Reviewed for currency 06-January-2018 ***

Symptoms

 When zfs_arc_max is not set in /etc/system, the maximum size of the ZFS ARC is set as follows by default.

 

However, it can be initialized to around 50% of physical memory minus 1GB with the following releases.

In the following example with 16GB physical memory, the max arc size is less than 7GB although it should be around 15GB.

 

Cause

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