Cluster Filesystem like VMware's VMFS?

[Christian Reiter]

Hi!

Is there any kind of cluster filesystem for use with xen available?
I think of the following:

I want to have on big SAN LUN presented to all of my dom0 Machines.
If one of the dom0 fails i can easily restart the domU on another dom0 
Machine
without having to represent the SAN-LUNs from the failed box to the 
remaining
working boxes.

VMware provides VMFS as solution. Is there anything comparable for Xen?

Mit freundlichen Grüßen,  ///  Kind Regards,
                                                 Christian Reiter

[Daniel P. Berrange]

On Thu, Apr 12, 2007 at 08:46:26PM +0200, Christian Reiter wrote:
> Hi!
>
> Is there any kind of cluster filesystem for use with xen available?
> I think of the following:
>
> I want to have on big SAN LUN presented to all of my dom0 Machines.
> If one of the dom0 fails i can easily restart the domU on another dom0 
> Machine
> without having to represent the SAN-LUNs from the failed box to the 
> remaining
> working boxes.
>
> VMware provides VMFS as solution. Is there anything comparable for Xen?

Any regular Linux cluster filesystem will do the job. eg GFS, or OCFS2
No need for anything Xen specific.

Dan.

[Christian Reiter]

Hi Dan!
> Any regular Linux cluster filesystem will do the job. eg GFS, or OCFS2
> No need for anything Xen specific.

Is the Number of domU-Images limited or can i have as much as i need?
There is something in the back of my mind...

BTW:
Is there any ClusterFS usable with Fedora out of the Box (RPM)?

How do i migrate my raw-partition stored domUs into file-stored domUs?
At this time i have one SAN LUN for every domU (/dev/sdb, /dev/sdc, ...)

Mit freundlichen Grüßen,  ///  Kind Regards,
                                                 Christian Reiter

[Andrew Cathrow]

On Thu, 2007-04-12 at 21:03 +0200, Christian Reiter wrote:
> Hi Dan!
> > Any regular Linux cluster filesystem will do the job. eg GFS, or OCFS2
> > No need for anything Xen specific.
>
> Is the Number of domU-Images limited or can i have as much as i need?
> There is something in the back of my mind...
>
> BTW:
> Is there any ClusterFS usable with Fedora out of the Box (RPM)?

GFS2 is included in the FC6 kernel.
> How do i migrate my raw-partition stored domUs into file-stored domUs?
> At this time i have one SAN LUN for every domU (/dev/sdb, /dev/sdc, ...)

You can just use dd to copy the files
dd if=/dev/sdb of=/var/lib/xen/images/mydisk.img

Make sure you use "tap:aio:" rather that "file:" for the syntax in the
xen guest config file
> Mit freundlichen Grüßen,  ///  Kind Regards,
>                                                  Christian Reiter
>
> --
> Fedora-xen mailing list
> [e-mail]
> https://www.redhat.com/mailman/listinfo/fedora-xen

--

Andrew Cathrow
Red Hat, Inc.

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[Pasi Kärkkäinen]

On Thu, Apr 12, 2007 at 07:12:56PM -0400, Andrew Cathrow wrote:
> On Thu, 2007-04-12 at 21:03 +0200, Christian Reiter wrote:
> > Hi Dan!
> > > Any regular Linux cluster filesystem will do the job. eg GFS, or OCFS2
> > > No need for anything Xen specific.
> >
> > Is the Number of domU-Images limited or can i have as much as i need?
> > There is something in the back of my mind...
> >
> > BTW:
> > Is there any ClusterFS usable with Fedora out of the Box (RPM)?
>
> GFS2 is included in the FC6 kernel.

Should you use GFS directly on SAN LUN, or CLVM on SAN LUN, and then GFS on
top of CLVM? Or even only CLVM for domU disks..

There seems to be no clear recommendation about that.

I think CLVM only would be the most efficient way.. Filesystem (GFS) is more
complex than just volume manager?

-- Pasi