RE: [Xen-users] Xen SAN Questions

["Tait Clarridge" <Tait.Clarridge@xxxxxxxxxxxx>]

Well I figured out one thing, that my numbers were totally off for EXT3 and XFS 
without DRBD haha.

I will do some more testing, I can't believe I ruled out "dd" as a viable 
benchmark.

*smacks forehead*

Thanks for the help, I am testing with those DRBD config options now.

Tait

-----Original Message-----
From: Nathan Stratton [mailto:nathan@xxxxxxxxxxxx] 
Sent: Tuesday, January 27, 2009 3:08 PM
To: Tait Clarridge
Cc: John Madden; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Xen SAN Questions


On Tue, 27 Jan 2009, Tait Clarridge wrote:

> With the DRBD and GFS (in primary/primary mode) setup I was seeing an 
> average of roughly 55MB/s as opposed to ~206MB/s for EXT3 and ~334 MB/s 
> on XFS... (unless my numbers are horribly wrong).

Hmm, what is your DRBD setup? Try the following:

     no-disk-barrier;
     no-disk-flushes;
     no-md-flushes;
     no-disk-drain;

> Which program are you benchmarking I/O with?

dd if=/dev/zero of=/share/test bs=1G count=8

><>
Nathan Stratton                                CTO, BlinkMind, Inc.
nathan at robotics.net                         nathan at blinkmind.com
http://www.robotics.net                        http://www.blinkmind.com



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