[CentOS] Adding RAM

John jses27 at gmail.com
Wed Dec 10 16:48:15 UTC 2008


On Wed, 2008-12-10 at 17:02 +0100, Peter Kjellstrom wrote:
> 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 at gmail.com> 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 at 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 at blah ~]# echo 'deadline' > /sys/block/hda/queue/scheduler
> > [root at 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.

Yes follow up to previous mail. That would be correct for those two. My
opinions do not change however, I just saw the mail where it did not
work because he has V4.x and needs to use grub.conf.



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