NFS Performance (was Re: [Beowulf] GPFS on Linux (x86))
csamuel at vpac.org
Wed Nov 8 18:57:26 PST 2006
On Saturday 16 September 2006 00:32, Brent Franks wrote:
> On 9/15/06, Chris Samuel <csamuel at vpac.org> wrote:
> > Wild guess - NFS servers are running RHEL and using ext3 ?
If you are using RHEL4 and are not at Update 4 already then apparently there
is a RH induced bug in the default cfq io_scheduler and the work around is
(according to Oracle at least ) to set the node to use the deadline
scheduler at boot time as well.
The better fix is apparently to update to RHEL4 U4.
 - Their OCFS2 page says:
# RHEL4 U2 and U3 users are advised to use the DEADLINE io scheduler instead
# of the default CFQ due to Bugzilla# 184535. (Ed: )
 - https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=184535
Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
Victorian Partnership for Advanced Computing http://www.vpac.org/
Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia
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