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docs: add zfs_arc_min < zfs_arc_max note

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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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Fabian Grünbichler 2021-04-23 13:03:43 +02:00 committed by Thomas Lamprecht
parent a22c19c35e
commit beed14f830
1 changed files with 13 additions and 0 deletions
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local-zfs.adoc
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@ -473,6 +473,19 @@ options zfs zfs_arc_max=8589934592
This example setting limits the usage to 8 GiB ('8 * 2^30^').
IMPORTANT: In case your desired +zfs_arc_max+ value is lower than or equal to
+zfs_arc_min+ (which defaults to 1/32 of the system memory), +zfs_arc_max+ will
be ignored unless you also set +zfs_arc_min+ to at most +zfs_arc_max - 1+.
----
echo "$[8 * 1024*1024*1024 - 1]" >/sys/module/zfs/parameters/zfs_arc_min
echo "$[8 * 1024*1024*1024]" >/sys/module/zfs/parameters/zfs_arc_max
----
This example setting (temporarily) limits the usage to 8 GiB ('8 * 2^30^') on
systems with more than 256 GiB of total memory, where simply setting
+zfs_arc_max+ alone would not work.
[IMPORTANT]
====
If your root file system is ZFS, you must update your initramfs every