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. -Ross