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
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@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 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On Thu, Nov 5, 2009 at 8:39 PM, Ryan Wagoner rswagoner@gmail.com wrote:
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
doesn't work if you only want it on one of several drives.
Your own /etc/init.d script or adding to rc.local.
2009/11/6 Larry Brigman larry.brigman@gmail.com:
On Thu, Nov 5, 2009 at 8:39 PM, Ryan Wagoner rswagoner@gmail.com wrote:
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
doesn't work if you only want it on one of several drives.
Your own /etc/init.d script or adding to rc.local.
Thanks to you and Ross Walker. Will do it that way.
Cheers,
--Amos
On Nov 5, 2009, at 8:59 PM, Amos Shapira amos.shapira@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?
There is no definite right way. I use /etc/rc.local for this with a little for loop like:
for dev in sdb sdc sdd; do echo deadline >/sys/block/${dev}/queue/scheduler done
-Ross
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Amos Shapira -
Larry Brigman -
Ross Walker -
Ryan Wagoner