Can't seem to be able to limit ZFS RAM usage (ARC)

[Ovidiu]

Freshly installed Proxmox 4.2 with a 2 HD mirror using ZFS for root

I'm following this instruction: https://pve.proxmox.com/wiki/Storage:_ZFS#Limit_ZFS_memory_usage

edited: /etc/modprobe.d/zfs.conf
inserted: options zfs zfs_arc_max=8589934592
ran: update-initramfs -u
rebooted

arcstat.py
    time  read  miss  miss%  dmis  dm%  pmis  pm%  mmis  mm%  arcsz     c
11:07:46     0     0      0     0    0     0    0     0    0   120M   15G

ARC Size:                               0.75%   120.60  MiB
        Target Size: (Adaptive)         100.00% 15.70   GiB
        Min Size (Hard Limit):          0.20%   32.00   MiB
        Max Size (High Water):          502:1   15.70   GiB

having 32Gb of RAm and arc still uses 15GB so my settings are being ignored.

 

[Ovidiu]

editing: /sys/module/zfs/parameters/zfs_arc_max and inserting 8589934592 has done the trick.
is this a viable solution?
is the wiki outdated?

 

[Ovidiu]

this solution did not survive a reboot. :-/

 

[mir]

Does this wiki still apply?
http://fibrevillage.com/storage/169-zfs-arc-on-linux-how-to-set-and-monitor-on-linux

 

[Ovidiu]

as far as I can see it also says to edit: /etc/modprobe.d/zfs.conf with the same values that is.