[CentOS] Adding RAM

Peter Kjellstrom cap at nsc.liu.se
Wed Dec 10 16:02:40 UTC 2008


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.

/Peter
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