[lustre-discuss] problem loading zfs properties for a lustre/zfs fs

Faaland, Olaf P. faaland1 at llnl.gov
Mon Jul 11 16:15:24 PDT 2016


1) What is the output of:

rpm -qa | grep zfs

from that system after it boots?

2) How do those values get into the /etc/modprobe.d/zfs.conf file?  Are they there before the node boots, or are modifying that file somehow during the boot process?

Olaf P. Faaland
Livermore Computing
________________________________________
From: lustre-discuss [lustre-discuss-bounces at lists.lustre.org] on behalf of Riccardo Veraldi [Riccardo.Veraldi at cnaf.infn.it]
Sent: Monday, July 11, 2016 3:53 PM
To: lustre-discuss at lists.lustre.org
Subject: [lustre-discuss] problem loading zfs properties for a lustre/zfs fs

Hello,
I am tailoring my system for lustre on ZFS and I am not able to set
these parameters
writing the config file /etc/modprobe.d/zfs.conf with the following options

options zfs zfs_prefetch_disable=1
options zfs zfs_txg_history=120
options zfs metaslab_debug:unload=1

when I check the parameters after boot in /sys/module/zfs/parameters
they are still the defaults, and my modification are not taken.

zfs.conf is being ignored at boot time I do not know why.

I had to do a

echo 1 > /sys/module/zfs/parameters/options zfs zfs_prefetch_disable

inside rc.local

to have it working

I am running RHEL7 with latest kernel  and zfs 0.6.5.7-1

any hints ?

thank you

Riccardo

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