[Linux-cluster] Xen on RHEL cluster

Jakov Sosic jakov.sosic at srce.hr
Sun Feb 28 23:26:15 UTC 2010

On 02/26/2010 06:29 PM, Jakov Sosic wrote:
> Hi.
> I'm using Xen on RHEL cluster, and I have strange problems. I gave raw
> volumes from storage to Xen virtual machines. With windows, I have a
> problem that nodes don't see the volume as same one.... for example:
> clusternode1# clusvcadm -d vm:winxp
> clusternode1# dd if=/dev/mapper/winxp of=/node1winxp
> clusternode2# dd if=/dev/mapper/winxp of=/node2winxp
> clusternode3# dd if=/dev/mapper/winxp of=/node3winxp
> When I download these files and diff them, they all three differ.
> Also, sometimes very strange things happen. For example I download some
> file into winxp, shut it down, then start it on another node, and file
> is missing?!?!?!?!
> Should I use CLVM and not raw volumes from storage? Why is this happening?

It seems that CLVM is solution (migrated whole cluster to clvm today),
and that the bug is double caching (both domU and dom0 caching), and
that bugs like this occur when using raw LUNs:

|    Jakov Sosic    |    ICQ: 28410271    |   PGP: 0x965CAE2D   |
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