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Re: [Xen-users] high availability iscsi and xen setup

To: Mark Adams <mark@xxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] high availability iscsi and xen setup
From: Bastian Blank <waldi@xxxxxxxxxx>
Date: Sat, 6 Nov 2010 21:38:19 +0100
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On Thu, Nov 04, 2010 at 12:58:30PM +0000, Mark Adams wrote:
> - Gaps in the availability? (split-brain possibilities?)

If one machine fails, you have to reliably kill it. This is usually done
with some sort of remote controlled power supply. If you completely
loose all communication channels between the two machines, this is not
longer possible. If you ignore that, you'll get split-brain in this
case. The only way do avoid split-brain is a quorum decision with an
uneven number of votes.

> - Is a clustered filesystem required?


> Thanks in advance for any advice or opinions on this.

You don't want to go that way, at least not with automatic failover.


Too much of anything, even love, isn't necessarily a good thing.
                -- Kirk, "The Trouble with Tribbles", stardate 4525.6

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