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

["saptarshi naha" <naha80@xxxxxxxxx>]

Hi,

Hans , I thinking of doing HA on 2 physical different servers after
running xen. I havent completely figured yest, but I am guessing that
both servers should be running xen , 1 being master and other being
slave. As soon the master VM fails on 1 server through heartbeat slave
VM from other server kicks in and is able to take over.

I wanted to know if anyone done DRBD and wanted to know its
performance  and also layering block devices?


On 9/6/06, Hans de Hartog <dehartog@xxxxxxxxxx> 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.
> In general, (IMHO) xen buys you nothing for HA.
Thanks,
Naha

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