[CentOS] Adding RAM

Ross Walker rswwalker at gmail.com
Tue Dec 9 13:50:49 UTC 2008


On Dec 9, 2008, at 3:30 AM, Peter Kjellstrom <cap at nsc.liu.se> wrote:

> On Tuesday 09 December 2008, Ross Walker wrote:
>> On Dec 8, 2008, at 6:51 PM, Matt <lm7812 at gmail.com> wrote:
> ...
>>>> Try setting the scheduler to 'deadline' and see if the queue sizes
>>>> shrink.
>>>
>>> I have googled this and having a bit of trouble figuring how to  
>>> change
>>> it under CentOS 4.
>>>
>>> http://www.wlug.org.nz/LinuxIoScheduler
>>>
>>> Does not seem to work on CentOS 4.
>>>
>>>> No raid1? Besides adding redundancy, it can help with read
>>>> performance. I would probably put the mail on a raid 10 though if I
>>>> had 4 disks to do so.
>>>
>>> I plan on moving to faster disks and RAID 1 down the road.  Just has
>>> not happened yet.
>>
>> 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=

-Ross



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