[CentOS] ext4 in CentOS 5.6?

Tue Jul 5 19:46:17 UTC 2011
Rudi Ahlers <Rudi at SoftDux.com>

On Tue, Jul 5, 2011 at 8:49 PM, Les Mikesell <lesmikesell at gmail.com> wrote:

> On 7/5/2011 1:30 PM, Rudi Ahlers wrote:
> > On Tue, Jul 5, 2011 at 8:20 PM, Les Mikesell<lesmikesell at gmail.com>
>  wrote:
> >>
> >> How much can that matter?  Reads are going to be cached in main RAM
> >> anyway - which is pretty cheap these days.
> >>
> >
> >
> > Yes, but I suppose it all depends on the needs of the server in question
> :)
> >
> > In our case, with web servers, reads (i.e. opening websites,
> > downloading content) far outweighs writes (which are basically logs,
> > file uploads, and sessions being written to disk.
> >
> > In case of forums (we have many clients with forums) reads&  writes
> > are sometimes equal, but even then reads are still more common in our
> > case than writes.
>
> But it doesn't matter if you lose the read cache in RAM - and the OS is
> going to keep a copy there as long as it can anyway.  The point of SSD
> caching of journals/writes is that it survives a reboot.  If you have a
> lot more SSD than spare RAM it might save a few seeks as a side effect
> but why not just add RAM if that matters?
>
> --
>   Les Mikesell
>    lesmikesell at gmail.com
>
>
>

It's not always easy, or even possible to add more RAM, especially since the
storage servers weren't fitted with motherboards that can take more than say
8 or 16GB RAM .

-- 
Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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