Setting scheduler for SSD devices only on a multiple device system

theking2 · 2013-07-13 09:24:48

Hi!

I have a homebuild NAS with a SSD for OS and /home and a RAID controllor with 4 HD configured with md/lvm.

On the SSD I want to specify the the scheduler to deadline, on the HD it should stay cfq.

In https://wiki.archlinux.org/index.php/So … _Scheduler it is explained how to do that persistantly with rc.local but since systemd that is not the way to go anymore. (don't want to have a mixed initscripts/systemd system).

What is the recommended way to set the scheduler on a multi device system?

graysky · 2013-07-13 09:34:53

Hmm... wiki is dated if recommending rc.local... use tmpfiles.

% cat /etc/tmpfiles.d/IO_scheduler.conf 
w /sys/block/sda/queue/scheduler - - - - deadline

theking2 · 2013-07-13 11:39:06

Thanks graysky. Works as breeze.

the one problem I might still have is that the devices are not always recognized in the same order. So I need somehow to find out how to target the SSD only even when it is not on sde as it is currently.

graysky · 2013-07-13 11:40:17

I believe the udev solution on the wiki will do this but it just needs to be started with a systemd service.

Arch Linux

#1 2013-07-13 09:24:48

Setting scheduler for SSD devices only on a multiple device system

#2 2013-07-13 09:34:53

Re: Setting scheduler for SSD devices only on a multiple device system

#3 2013-07-13 11:39:06

Re: Setting scheduler for SSD devices only on a multiple device system

#4 2013-07-13 11:40:17

Re: Setting scheduler for SSD devices only on a multiple device system

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