On Tue Feb 24, 2026 at 11:54 AM CET, Maximiliano Sandoval wrote: > We rephrase the current section putting more emphasis on the current > state of things given than Proxmox VE 8.1 was released over two years > ago. > > This also frames the problem for pre-existing setups in its own > paragraph. > > Signed-off-by: Maximiliano Sandoval <[email protected]> > --- > local-zfs.adoc | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > > diff --git a/local-zfs.adoc b/local-zfs.adoc > index 4f20d00..12506d1 100644 > --- a/local-zfs.adoc > +++ b/local-zfs.adoc > @@ -586,10 +586,13 @@ configured for the root user. > Limit ZFS Memory Usage > ~~~~~~~~~~~~~~~~~~~~~~ > > -ZFS uses '50 %' of the host memory for the **A**daptive **R**eplacement > -**C**ache (ARC) by default. For new installations starting with {pve} 8.1, > the > -ARC usage limit will be set to '10 %' of the installed physical memory, > clamped > -to a maximum of +16 GiB+. This value is written to > `/etc/modprobe.d/zfs.conf`. > +ZFS uses '10 %' of the host memory, clamped to a maximum of +16 GiB+, for the > +**A**daptive **R**eplacement **C**ache (ARC) by default. This value is > written > +to `/etc/modprobe.d/zfs.conf` during installation. > + > +Before {pve} 8.1, the ARC usage limit was set to '50 %' without clamping it > to a > +maximum size. For existing installations that predate {pve} 8.1, manual steps > +would have to be performed in order to lower the usage limit as described > below.
this and the other patch in this series looks good to me, one small comment: maybe mention that this isn't something set by the installer or pve, but rather just the zfs default [1]. [1]: https://openzfs.github.io/openzfs-docs/man/master/4/zfs.4.html#zfs_arc_max other than that, consider this: Reviewed-by: Shannon Sterz <[email protected]> > > Allocating enough memory for the ARC is crucial for IO performance, so > reduce it > with caution. As a general rule of thumb, allocate at least +2 GiB Base + 1
