Re: [Xen-users] What is the "fastest" way to access disk storage from DomU?

["Todd Deshane" <deshantm@xxxxxxxxx>]

Sorry for top-posting. Re-sending to fix it.

On Jan 23, 2008 7:44 PM, Maximilian Wilhelm <max@xxxxxxxxxxx> wrote:

Hi!

I've some Xen servers with local disks as DomU system and data storage
and for some days one with SAN storage.

I've read some threads about storage speed here but didn't really got
a clue on what's the "best" or fastest way to set it up.

At the moment all the virtual disks are configured as

 disk = [ "phy:/dev/vg_xen1/<LV>,xvda1,w", ... ]

The volumes residing on the SAN storage are configured via EVMS and
I've 200MB/s writing speed from Dom0 (mesured with dd if=/dev/zero
of=/mnt/file) and "only" around 150MB/s when doing the same from DomU.

Is this expected speed loss or is there any other way to give the DomU
access to the devices?

Ciao
Max

On Jan 23, 2008 9:27 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:

You should look into the iozone bechmark, http://www.iozone.org/

Try running on different configuration and report back your results.

We have actually had a few different setups some with iSCSI, AoE, LVM and non-LVM. I will see if I can get some benchmarks run on some of our setups too.

Some things to watch out for are network latency in general or the load on the NAS/SAN box.

Regards,
Todd


 

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