On Sat, Feb 27, 2010 at 07:48:50PM +0100, Zoran Popovi? wrote:
> I had same situation, though I am not using cluster (I am using multipath
> and raw devices on shared storage). My workaround is issuing:
>
> echo 1 > /proc/sys/vm/drop_caches
>
> after finishing copy or after an external change (e.g. by action on the
> shared storage independently from host) on the raw device. It works like a
> charm, but I am not sure what would be the right solution with cluster and
> raw devices - GFS is fine with files, CLVM with LVMs, but I am not using
> LVM either (and CLVM has a drawback - snapshots are not supported).
>
> ZP.
>
> 2010/2/27 Jakov Sosic <[1]jakov.sosic@xxxxxxx>
>
> 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 maybe CLVM and not raw volumes from storage? Why is this
> happening?
>
What are these /dev/mapper/winxp devices? multipath devices?
Are you using drbd, iSCSI or FC?
-- Pasi
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