[Xen-users] Re: Xen for network services (aka web/mail/dns etc)

[Charles Duffy <cduffy@xxxxxxxxxxx>]

Simon wrote:
> On 12/1/05, Charles Duffy <cduffy@xxxxxxxxxxx> wrote:
>
> > So long as the system is up to the CPU and IO load you'll be placing on
> > it (and without knowing your load, it's hard to say much), you shouldn't
> > have trouble. However, a few pieces of advice:
> The load on the current mysql server is -0.1 average.
Right, but that's a completely different workload than it's going to 
have later.
> > - Move your MySQL instance into a DomU, even if it's not as convenient
> > as you'd like.
> I have been thinking of leaving this as a completly seperate server
> and purchasing new equiptment for running Xen on. I have been looking
> at IBM xSeries 446 rack gear with dual 3.0Ghz Xeon 'Irwindale'
> processors.
>
> In looking at new gear? What would be the best processors to concider?
We're an AMD shop, and very happy to be so. Any advice I gave you wrt 
processors would be heavily slanted in that direction. (There are the 
power considerations, of course -- and from what we understand, AMD's 
dual core architecture performs significantly better than Intel's).
> What is the optimum storage ideal here? Currently we have a RAID 5
> disk with a fair amount of space available. Also: Can you store your
> domU partitions on a NAS or something?
Whatever works for you -- depends on your workload. Yes, you can keep 
the storage in question on a NAS. If it's iSCSI, AOE or otherwise at a 
block device level (rather than something akin to NFS), I recommend 
mounting the devices on the Dom0 and incorporating that into your 
volumes which get exported to the DomUs.
Having your storage be on a NAS should make migrating your DomUs around 
between Xen servers (for hardware maintenance or whatnot) easier.

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