[CentOS] Right way to set IO scheduler on CentOS

Ryan Wagoner rswagoner at gmail.com
Fri Nov 6 04:39:13 UTC 2009


Edit /etc/grub.conf and add elevator=deadline to the end of the kernel
line. For example

title CentOS (2.6.18-128.4.1.el5)
        root (hd0,0)
        kernel /vmlinuz-2.6.18-128.4.1.el5 ro root=LABEL=/ elevator=deadline
        initrd /initrd-2.6.18-128.4.1.el5.img

Ryan

On Thu, Nov 5, 2009 at 8:59 PM, Amos Shapira <amos.shapira at gmail.com> wrote:
> Hello,
>
> I'd like to set the io scheduler on some of the disks on our Dom0
> (CentOS 5) to "deadline".
>
> The way I found to do this is with "echo deadline >
> /sys/block/sdb/queue/scheduler".
>
> What is the Right Way(TM) to set this automatically during boot?
>
> I sort of expected to use sysctl but it appears to only deal with
> pseudo-files under /proc/sys, not /sys.
>
> Also "sysctl -a" doesn't list such options.
>
> Searching the web also only comes up with the "echo" method mentioned
> everywhere.
>
> Is my only way to add some /etc/init.d script or /etc/rc.local line?
>
> Thanks,
>
> --Amos
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