* [pve-devel] [PATCH docs] docs: add zfs_arc_min < zfs_arc_max note
@ 2021-04-23 11:03 Fabian Grünbichler
2021-04-24 17:42 ` [pve-devel] applied: " Thomas Lamprecht
0 siblings, 1 reply; 2+ messages in thread
From: Fabian Grünbichler @ 2021-04-23 11:03 UTC (permalink / raw)
To: pve-devel
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
local-zfs.adoc | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/local-zfs.adoc b/local-zfs.adoc
index 423f569..0b1ee37 100644
--- a/local-zfs.adoc
+++ b/local-zfs.adoc
@@ -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
--
2.20.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* [pve-devel] applied: [PATCH docs] docs: add zfs_arc_min < zfs_arc_max note
2021-04-23 11:03 [pve-devel] [PATCH docs] docs: add zfs_arc_min < zfs_arc_max note Fabian Grünbichler
@ 2021-04-24 17:42 ` Thomas Lamprecht
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Lamprecht @ 2021-04-24 17:42 UTC (permalink / raw)
To: Proxmox VE development discussion, Fabian Grünbichler
On 23.04.21 13:03, Fabian Grünbichler wrote:
> Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
> ---
> local-zfs.adoc | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
>
applied, thanks!
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-04-23 11:03 [pve-devel] [PATCH docs] docs: add zfs_arc_min < zfs_arc_max note Fabian Grünbichler
2021-04-24 17:42 ` [pve-devel] applied: " Thomas Lamprecht
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