[CentOS] atime, relatime query

James Hogarth james.hogarth at gmail.com
Wed Feb 3 12:38:54 UTC 2010


On 3 February 2010 10:20, Rajagopal Swaminathan <raju.rajsand at gmail.com> wrote:
> Greetings,
>
> I am aware that mounting filesystems with noatime option greatly
> increases speed.
>
> I have tried to follow discussion on the pros and cons of using noatime.
>
> I have however not been able to mount with the option relatime in centos 5.2.
>
> But in a production db server, which is backed up by HP DP, is it
> advisable to mount with noatime?
>
> Anybody care to share their experience on it?
>
> Regards
>
> Rajagopal
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>

All of my DB systems and more importantly integration and functional
testing systems are noatime and there is a marked difference in
performance - literally cutting testing time by at least half... There
is a lot of disk I/O in that...

RHEL doesn't have a reltime enabled kernel so centos doesn't either by
default. I believe that there is a kernel in plus that is reltime
enabled but due to potentially breaking ABI compatibility with RHEL I
don't make use of it.

James


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