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Re: [Xen-users] cluster filesystems

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Brock Edward Palen <brockp@xxxxxxxxx>
  • Date: Mon, 10 Apr 2006 13:42:53 -0400
  • Delivery-date: Mon, 10 Apr 2006 10:45:07 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Peter Fokkinga wrote:
Quoting Brock Edward Palen <brockp@xxxxxxxxx>:
The ocfs2 website says that ocfs2 was pushed into the main line 2.6.16
did this happen?  and if so has anyone tried kernel.org ocfs2 with
xen? This would make my upgrade to 3 much faster :)

I'm running Xen 3.0.2 using the 2.6.16 kernel on Ubuntu Dapper
(the upcoming release). Using a shared ocfs2 volume in multiple
domU's seem to work fine, although I have not extensively tested
(performance?) it yet.
Ive just been reading on ocfs2 and a lwn article
and makes the comment that its ment to be used: "s meant to operate with a disk which is, itself, shared across the cluster (perhaps via some sort of storage-area network or multipath scheme)." So this requires some sort of NAS unit? or does it work like PVFS2 ware each machine has its own local disk holding only a portion of the data? Like a global raid ware the hosts are the block devices and not the disks directly?

Xen normally refuses to start a domU with a volume that is already
in use (mounted) elsewhere, but you can force it with an exclamation
point. Example:
 disk = ['phy:/dev/vg1/jetU,hda1,w', 'phy:/dev/vg1/shared,hdb1,w!']
Ex thankyou

One last thing, I did compile Xen Xen/Linux from source; I don't
know if the binary distribution includes ocfs2 support.
No problem use gentoo right now, so im doing that anyway.... :-)

Regards, Peter

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