On Wednesday 10 December 2008, John wrote: > On Tue, 2008-12-09 at 12:07 -0500, Ross Walker wrote: > > On Dec 9, 2008, at 10:59 AM, Matt <lm7812@xxxxxxxxx> wrote: > > >>>> Setting scheduler is global in C4 it can be set as a kernel option > > >>>> with a scheduler=deadline in grub. > > >>> > > >>> Is that an alias for "elevator=deadline" (which I know works)? > > >> > > >> No that was me forgetting the option name. > > >> > > >> Thanks Peter, it's elevator= not scheduler= > > > > > > Does this mean I need to add "elevator=deadline" to grub.conf? Is > > > there a way to make the change without rebooting? > > > > I'm afraid not, so possibly a late night or weekend event with the > > option for a mid day reboot to recover if things turn out badly. > > > > Virtualize things and you can minimize downtime with snapshots. > > [root@blah ~]# cat /sys/block/hda/queue/scheduler > noop anticipatory deadline [cfq] > The Schedular is CFQ and can be changed on the fly to whatever Block > Device you want it. ... > [root@blah ~]# echo 'deadline' > /sys/block/hda/queue/scheduler > [root@blah ~]# cat /sys/block/hda/queue/scheduler > noop anticipatory [deadline] cfq -- Changed to Deadline. ...this is correct on CentOS-5. On CentOS-4 you need to do it via grub and a reboot. /Peter
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