[Lustre-discuss] (no subject)

[David Dillow]

On Mon, 2009-05-11 at 13:35 -0700, Hayes, Robert N wrote:
> While performing a single copy, single client write/read test using
> dd, we are finding that our Nehalem clients running 
> 
> 2.6.18-92.1.10.el5-lustre-1.6.5.1 
> 
> write about half the speed of our Nehalem clients running 
> 
> 2.6.18-53.1.13.el5_lustre.1.6.4.3 to three different lustre file
> systems.

We've seen a fairly substantial block-level device throughput regression
going from -53 to -92 without involving Lustre, but I've not yet had
time to run down the changes to see what could be causing it.

-- 
Dave Dillow
National Center for Computational Science
Oak Ridge National Laboratory
(865) 241-6602 office