[Beowulf] Building new cluster - estimate

Perry E. Metzger perry at piermont.com
Tue Aug 5 20:06:33 EDT 2008


Chris Samuel <csamuel at vpac.org> writes:
> ----- "Matt Lawrence" <matt at technoronin.com> wrote:
>
>> I have never had any problems with ext3.
>
> I suspect you're not doing a lot of disk I/O, we
> found NFS servers using ext3 as a back end would
> crumble under the weight of lots of writes as ext3
> is single threaded through the journal daemon.
>
> That means that you end up with all your NFS daemons
> blocking on that, stalling everything else. :-(

Put your journal onto a battery backed RAM card or the equivalent on
the RAID controller and it significantly speeds up dealing with a
journal.

Perry
-- 
Perry E. Metzger		perry at piermont.com
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