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

[Dominik Klein <dk@xxxxxxxxxxxxxxxx>]

> 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?
Correct.

> 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.
Regards
Dominik

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