High RAM consumption - ZFS ?

drnicolas · Post by **drnicolas** » 28 Feb 2015 20:39

I see, that my RAM consumption increases a few minutes after reboot to 82-83% and stays there.
I see this now for about 36h.

Who eats up my RAM? I have 12GB of ECC-RAM and newest build 1349

I am asking this, because I see reproducable Crashs/reboots by doing backups Jobs to a ZFS volume.

Post by **b0ssman** » 28 Feb 2015 23:03

what are your loader.conf settings.

drnicolas · Post by **drnicolas** » 28 Feb 2015 23:08

System/Advanced/loader.conf

does not show ANYthing !!

Post by **b0ssman** » 28 Feb 2015 23:20

check /cf/boot/loader.conf

Post by **b0ssman** » 28 Feb 2015 23:32

also please respond to the posts in threads you create.

viewtopic.php?f=66&t=8339&p=50610#p50610

do no create new threads for the same problem.

drnicolas · Post by **drnicolas** » 01 Mar 2015 07:32

Okay. This is the content of /cf/boot/loder.conf:

Code: Select all

mfsroot_load="NO"
mfsroot_type="mfs_root"
mfsroot_name="/mfsroot"
hw.est.msr_info="0"
hw.hptrr.attach_generic="0"
kern.maxfiles="65536"
kern.maxfilesperproc="60000"
kern.cam.boot_delay="8000"
autoboot_delay="3"
isboot_load="YES"
zfs_load="YES"
xmfsroot_load="YES"
xmfsroot_type="xmd_root"
xmfsroot_name="/mfsroot.uzip"
geom_xmd_load="YES"
# ZFS kernel tune
vm.kmem_size="10752M"
vfs.zfs.arc_min="9216M"
vfs.zfs.arc_max="9216M"
vfs.zfs.prefetch_disable="1"
vfs.zfs.txg.timeout="5"
vfs.zfs.vdev.max_pending="10"
vfs.zfs.vdev.min_pending="4"
vfs.zfs.write_limit_override="0"
vfs.zfs.no_write_throttle="0"

In another posting there was a hint that - at least for 32bit - wrong values for some zfs-parameters can cause crashs.
At first, I thought that my problem has gone after changing the values according t the suggestions of ZFS Kernel tune. But this seems not to be true.

The crashs did not stop

drnicolas · Post by **drnicolas** » 01 Mar 2015 07:43

I just see that my ZFS volume has "synchronisation" set to disabled.
Can this cause my crashs ?

drnicolas · Post by **drnicolas** » 01 Mar 2015 07:47

Maybe the settings for vm.kmemsize and vfs.zfs.arc_min is the solution arc_min / kmem_size is about 0,85 which is close to the 82% mentioned.

Post by **b0ssman** » 01 Mar 2015 08:54

have you done the suggested work form the other thread?

drnicolas · Post by **drnicolas** » 01 Mar 2015 13:25

I think, I have done the homework, if you think of tweaking the Settings:

Code: Select all

login as: root
root@hp-nas's password:
Last login: Sun Mar  1 12:21:36 2015
Welcome to NAS4Free!
hp-nas: ~ #  sysctl vm.kmem_size vfs.zfs.arc_min vfs.zfs.arc_max
vm.kmem_size: 11274289152
vfs.zfs.arc_min: 9663676416
vfs.zfs.arc_max: 9663676416

Post by **b0ssman** » 02 Mar 2015 09:00

But you have not removed the 4gb memory stick.

Sent from my iPhone using Tapatalk

drnicolas · Post by **drnicolas** » 05 Mar 2015 21:43

Yes, I hav a 4GB Stick. But I think NAS4Free is installed there and the stick is needed for boot

Post by **b0ssman** » 06 Mar 2015 09:09

memory as in ram

do you even read the posts in your other threads

viewtopic.php?f=66&t=8339&p=50610#p50615

XigmaNAS