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

[Riccardo Veraldi]

Hello,

lsinitrd | grep zfs
-rwxr--r--   1 root     root       493080 Jul 12 12:56 
usr/lib/modules/3.10.0-327.18.2.el7.x86_64/extra/kernel/fs/lustre/osd_zfs.ko
-rw-r--r--   1 root     root      2245128 Jul 12 12:56 
usr/lib/modules/3.10.0-327.18.2.el7.x86_64/extra/zfs.ko
-rw-r--r--   1 root     root            4 May 12 20:18 
usr/lib/modules-load.d/zfs.conf


if I do

lsinitrd -f usr/lib/modules-load.d/zfs.conf
zfs

so looks like zfs is loaded by initramfs

do I have to add a etc/modprobe.d/zfs.conf inside the initramfs ?

I mean /etc/modprobe.d/zfs.conf  from the root partition should be 
loaded anyway.

thanks






On 12/07/16 11:51, Faaland, Olaf P. wrote:
> Actually, looks like you can use simpler syntax:
>
> lsinitrd | grep zfs
>
> Olaf P. Faaland
> Livermore Computing
>
> ________________________________________
> From: lustre-discuss [lustre-discuss-bounces at lists.lustre.org] on behalf of Faaland, Olaf P. [faaland1 at llnl.gov]
> Sent: Tuesday, July 12, 2016 11:48 AM
> To: Riccardo Veraldi; lustre-discuss at lists.lustre.org
> Subject: Re: [lustre-discuss] problem loading zfs properties for a lustre/zfs fs
>
> Riccardo,
>
> Does your initramfs still include zfs-related files?  What is the output of
>
> lsinitrd /boot/init*$(uname -r)* | grep zfs
>
> Olaf P. Faaland
> Livermore Computing
>
> ________________________________________
> From: Riccardo Veraldi [Riccardo.Veraldi at cnaf.infn.it]
> Sent: Monday, July 11, 2016 5:25 PM
> To: Faaland, Olaf P.; lustre-discuss at lists.lustre.org
> Subject: Re: [lustre-discuss] problem loading zfs properties for a lustre/zfs fs
>
> On 11/07/16 17:02, Faaland, Olaf P. wrote:
>> Riccardo,
>>
>> If you are not booting from a zpool, you do not need the "zfs-dracut" package.  This package causes ZFS to be loaded very early in the boot process, most likely before your /etc/modprobe.d/zfs.conf files is visible to the kernel.
>>
>> As long as you are not booting from a zpool, remove that package (rpm -e) and boot again to see if your problem is fixed.
> I did it I removed zfs-dracut since I do not boot from ZFS.
>
>    cat /etc/modprobe.d/zfs.conf
> options zfs zfs_prefetch_disable=1
> options zfs zfs_txg_history=120
> options zfs metaslab_debug_unload=1
>
> after reboot
>
> cat /sys/module/zfs/parameters/zfs_prefetch_disable
> 0
>
> cat /sys/module/zfs/parameters/zfs_txg_history
> 0
>
> so it looks like the parameters inside zfs.conf are ignored
>
> ls -la /etc/modprobe.d/zfs.conf
> -rw-r--r-- 1 root root 103 Jul 11 17:18 /etc/modprobe.d/zfs.conf
>
>
>
>> -Olaf
>>
>> ________________________________________
>> From: Riccardo Veraldi [Riccardo.Veraldi at cnaf.infn.it]
>> Sent: Monday, July 11, 2016 4:55 PM
>> To: Faaland, Olaf P.; lustre-discuss at lists.lustre.org
>> Subject: Re: [lustre-discuss] problem loading zfs properties for a lustre/zfs fs
>>
>> On 11/07/16 16:15, Faaland, Olaf P. wrote:
>>> 1) What is the output of:
>>>
>>> rpm -qa | grep zfs
>> libzfs2-0.6.5.7-1.el7.centos.x86_64
>> zfs-dkms-0.6.5.7-1.el7.centos.noarch
>> lustre-osd-zfs-mount-2.8.0-3.10.0_327.18.2.el7.x86_64.x86_64
>> zfs-0.6.5.7-1.el7.centos.x86_64
>> zfs-dracut-0.6.5.7-1.el7.centos.x86_64
>> lustre-osd-zfs-2.8.0-3.10.0_327.18.2.el7.x86_64.x86_64
>>> 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?
>> I edited those values myself inside zfs.conf then rebooted the system,
>> but they are not loaded
>>
>> thank you
>>
>> Riccardo
>>
>>
>>> 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
>>>
>>> _______________________________________________
>>> lustre-discuss mailing list
>>> lustre-discuss at lists.lustre.org
>>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>>>
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