RE: [Xen-users] Xen SAN Questions

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

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).

I am running tests on two identical Dell Poweredge 1850's.

Each with a Xeon Dual Core @ 2.8 GHz + 1GB ram (to benchmark)
Centos  5.2
Xen 3.1 
DRBD 8.2.6


Which program are you benchmarking I/O with?

Tait




-----Original Message-----
From: Nathan Stratton [mailto:nathan@xxxxxxxxxxxx] 
Sent: Tuesday, January 27, 2009 2:47 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:

> To clarify, the disks themselves will be a RAID-5 local to each machine 
> (1 array per machine, 2 in total) with DRBD running between to sort of 
> RAID-1 them over the network. Does that help? I want to take the local 
> RAID from both machines and turn it into a SAN.

We get about 166 MB/s write with our DRBD setup, what numbers are you 
seeing? Our hardware is:

Supermicro X7DWN+
Dual Xeon 5410
3ware 9650SE-16ML (in RAID 6 mode)
Centos 5.2
Xen 3.3.0
DRBD 2.3.0


><>
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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