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

To:	xen-users@xxxxxxxxxxxxxxxxxxx
Subject:	Re: [Xen-users] What is the "fastest" way to access disk storage from DomU?
From:	"Todd Deshane" <deshantm@xxxxxxxxx>
Date:	Wed, 23 Jan 2008 21:27:54 -0500
Delivery-date:	Wed, 23 Jan 2008 18:28:55 -0800
Dkim-signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:references; bh=eJJ8JF6AO6y6ugJHMUBITZi6sQvN/6dR7k4rir8myQc=; b=V0gxel+q2CQZF8NcpECn07AGpuYF1jfgU4I3JmGUEEVKHfUMx8KizApgIz6RBrWj5lkxa7RMRbp/lwCVGG8doWoZlxueRRExJX4vkTLTklXOQZ5Hi9Rv6hkkWm2Yc+8d5K+C9VJ3R/Rwz+66DEa6781sfxXGUR7v5XckIZYlFvs=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:references; b=NFwi54cel4HL807/+2n2NGhQ+2nJ7xZma3Nx2uaLnN9VQ5f7y+W/t8a+hHWo1hRyYAd88P/8T8e6zYjXGOsAKOXPJeQ0JOSB89AeFd4bAmZS52SvDi1l+iTKiALfSq1zfbk45NmtdGu5w5zK3VLUYSquR2dbUFC86I3hinE6jIA=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<20080124004402.GG17160@xxxxxxxxxxxxxxxxxxx>
List-help:	<mailto:xen-users-request@lists.xensource.com?subject=help>
List-id:	Xen user discussion <xen-users.lists.xensource.com>
List-post:	<mailto:xen-users@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References:	<20080124004402.GG17160@xxxxxxxxxxxxxxxxxxx>
Reply-to:	deshantm@xxxxxxxxx
Sender:	xen-users-bounces@xxxxxxxxxxxxxxxxxxx

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

Try running on different configuration and report back your results.

Regards,
Todd

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
--
Follow the white penguin.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

WARNING - OLD ARCHIVES

xen-users

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