This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-users] RE: Tutorial : Debian, Xen and CLUSTER / GFS Support

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] RE: Tutorial : Debian, Xen and CLUSTER / GFS Support
From: PAINCHAUD Christophe <cpainchaud@xxxxxxxxxxx>
Date: Tue, 22 Nov 2005 18:30:12 +0100
Cc: michael.mey@xxxxxx
Delivery-date: Tue, 22 Nov 2005 17:30:10 +0000
Envelope-to: www-data@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>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
>Hey, nice tutorial :)
Thank you ;)

>Have you got domUs running with image-files on a gfs?

        I tried to put some domUs images on a GFS shared (through GNBD)
filesystem. Everything was running fine until I launched the domU : I had
tons of I/O errors. On CLUSTER ML, many users are reporting the same problem
when they are trying to lock and read/write on a very large file (over 1Gb).

        So I am using another way (which is in fact the ENBD way, shared
block devices over network). I created some LVM volumes VM01, VM02, VM03
(that I formatted with EXT3) then I exported them in GNBD. All my Xen nodes
are importing volumes from my GNBD1 server and I can run my domU very
smoothly. So far I was able to produce 55MBytes/s writes on the LVM volumes!
That's really a performant technology. I think I won't be able to do better
unless I use some fiber instead of my Gigabit interface (and I would run
into the SCSI speed limit of my disks :p). CPU on both machines was not much

        The LVM solution is also interesting for backups : you can do a
snapshot of a volume and then make a backup of it, then destroy the
snapshot. It doesn't require to stop the VM using the volume.

        I will retry the domU image on GFS later, may be I did something
wrong. I would be glad to know if any of you got read of the read/write/lock
error when running a domU from it.

Christophe PAINCHAUD

Attachment: smime.p7s
Description: S/MIME cryptographic signature

Xen-users mailing list