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

[Julian Davison <julian@xxxxxxxxxxxxxxxxxxx>]

Hans de Hartog wrote:
> saptarshi naha wrote:
> > Hi,
> >
> > 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
> dies).
> 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.



--
Regards,
Julian Davison, ICT Technician
Christchurch Boys' High School
http://www.cbhs.school.nz/

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