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Re: [Xen-users] XEN and clustering?
- To: Jakov Sosic <jakov.sosic@xxxxxxx>
- From: Zoran Popović <shoom013@xxxxxxxxx>
- Date: Sat, 27 Feb 2010 19:48:50 +0100
- Cc: xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Sat, 27 Feb 2010 10:49:59 -0800
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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 <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?
--
| Jakov Sosic | ICQ: 28410271 | PGP: 0x965CAE2D |
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