Memory utilization

2020-10-16T23:28:28Z

72.225.207.145: The link was leading to a malcious ad! I replaced it with an archive.org version.

Memory Utilization

To set a persistent arc maximum, you need to create a new file <code>/etc/zfs/zsysctl.conf</code>. An example file is installed at <code>/etc/zfs/zsysctl.conf.example</code>.

Open <code>/etc/zfs/zsysctl.conf</code> in your favorite text editor, and add a line like this:

kstat.zfs.darwin.tunable.zfs_arc_max=11811160064

This would limit the arc max to 11GB (see table below).

You may also wish to set the arc meta limit explicitly. The default is 1/4 of the arc max, but for some workloads 3/4 may be more appropriate. Setting 3/4 of the arc max above:
kstat.zfs.darwin.tunable.zfs_arc_meta_limit=8858370048

For additional information, please see [[Performance]].

{| class="wikitable"
|-
! GB !! bytes
|-
| 1 || 1073741824
|-
| 2 || 2147483648
|-
| 3 || 3221225472
|-
| 4 || 4294967296
|-
| 5 || 5368709120
|-
| 6 || 6442450944
|-
| 7 || 7516192768
|-
| 8 || 8589934592
|-
| 9 || 9663676416
|-
| 10 || 10737418240
|-
| 11 || 11811160064
|-
| 12 || 12884901888
|-
| 13 || 13958643712
|-
| 14 || 15032385536
|-
| 15 || 16106127360
|-
| 16 || 17179869184
|-
| 17 || 18253611008
|-
| 18 || 19327352832
|-
| 19 || 20401094656
|-
| 20 || 21474836480
|-
| 21 || 22548578304
|-
| 22 || 23622320128
|-
| 23 || 24696061952
|-
| 24 || 25769803776
|-
| 25 || 26843545600
|-
| 26 || 27917287424
|-
| 27 || 28991029248
|-
| 28 || 30064771072
|-
| 29 || 31138512896
|-
| 30 || 32212254720
|-
| 31 || 33285996544
|-
| 32 || 34359738368
|}

== External links ==
* [https://web.archive.org/web/20160313014002/http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Limiting_the_ARC_Cache ZFS Evil Tuning Guide]

OpenZFS on OS X - User contributions [en]

Memory utilization