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Re: [Xen-users] Improve performance of domain U

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Subject: Re: [Xen-users] Improve performance of domain U
From: Julian Davison <julian@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 06 Sep 2006 08:19:25 +1200
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Hans de Hartog wrote:
saptarshi naha wrote:

I am about to try DRBD with HEATBEAT for High Availability.
Has anyone done that? How to layer it? I have LVM then GNBD.

How is performance of DRBD? Is there a better method than DRBD to do HA
in xen?

Please correct me if I'm wrong. I'm just starting with
xen and I just googled for BRDB but my experience with
HA could not refrain me from the following remarks:

If you're into HA, the first rule is: eliminate SPOFs
(Single Points Of Failure). Your physical box IS a SPOF.
So, running more operating systems on a single box (xen)
does not give you more availability (on the contrary, the
more dom's you're running, the more dom's die if your box
Therefore, using DRBD within xen-domains on the same physical
box doesn't give you more availablity either.

That makes sense :)

In general, (IMHO) xen buys you nothing for HA.

However, I thought the advantage of xen for HA was
primarily due to easy migration. If things are about
to fall over it's a simple process to move the domains
to other hardware.

Julian Davison, ICT Technician
Christchurch Boys' High School

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