[Xen-users] Re: XEN and clustering?

[Klaus Steinberger <klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx>]

> 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 maybe CLVM and not raw volumes from storage? Why is this
> happening?

You mean LUN's from a storage? Do you use the GPLPV drivers inside the Windows 
HVM ?

Then you probably run into the same or a similar trouble which is described in
this bug report:

https://bugzilla.redhat.com/show_bug.cgi?id=466681


Dropping vm caches helps:

echo 1 > /proc/sys/vm/drop_caches

Also using clvm helps, but you will loose the snapshot features of the storage,
lvm snapshot are not possible in a clustered environment.


Sincerly,
Klaus

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