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Re: [Xen-users] Debian Etch Xen Cluster (DRBD, GNBD, OCFS2, iSCSI, Heart

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Subject: Re: [Xen-users] Debian Etch Xen Cluster (DRBD, GNBD, OCFS2, iSCSI, Heartbeat?)
From: Dominik Klein <dk@xxxxxxxxxxxxxxxx>
Date: Thu, 13 Sep 2007 14:36:00 +0200
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Node1 should run A and D while node2 should run B and C. If Node1 fails A and D should switch to node2 and switch back after node1 is back again. I red a lot about very complex setups with OCFS2, iSCSI or GNBD but i think all i need ist DRBD and Heartbeat, isn't it?


Is it possible to tell Xen 3.1 to use a DRBD device to store the guests filesystem on it?

See http://lists.xensource.com/archives/html/xen-users/2007-09/msg00059.html

Will it be possible to switch the windows server?

Shutdown on A, start on B should be possible. But beware I never dealt with HVM guests. It should be possible though.

PVM can use live-migration if you use drbd two-primary mode.

Will the data stay consistent in my database?

As long as there is no drbd error: yes.

Would it be better to use a 3rd node running iSCSI as shared storage?
Any suggestions?

You would at least have to have 2 more nodes to run iscsi to make storage high available, too. HA domU with SPOF storage is not the best idea imho.


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