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

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> Thanks Mark, I am installing now :)
>
> On the subject of hardware, i am looking at the xSeries 336 from IBM
> (as discussed already). These have dual xeon's. 1 of the above (to
> begin with), 4GB of RAM and RAID1 for the host OS.

Nb if you want to fully use the 4GB you'll want to install x84_64 Xen (or PAE 
Xen if you really don't want to use x86_64).  This is because of limitations 
of the PC platform.  If you ever extend the memory further then you'll 
certainly want to be using a version of Xen with full addressing capability.

Bear in mind that for Xen-native guests, you need to match kernel and Xen 
addressing mode: i.e. PAE guest on PAE Xen, 32-on-32, 64-on-64 - no mixing 
them up.  This doesn't apply to fully-virtualised guests, which will run 
under a Xen of equal or greater addressing size.

> The AOE EtherDrive 
> for storage for the domU's (giving the ability to move a domU from
> server to server?) - is this overkill?.

You can set up some software-based network storage solution (e.g. enbd) - test 
that and see if it performs well enough for your workload.

> - apache/php domU
> - apache/asp(sun asp) domU
> - dbmail/imap/pop domU
> - smtp-in/av/spam domU
> - smtp-out/av domU (for autheticated clients)
> - mysql domU (for apache servers)
> - mysql domU (for dbmail and mydns)
> - dns (mydns) domU
>
> What would be the best way to spread the domUs across the available
> servers?

Depends how highly loaded they are.  If you set up networked storage, you can 
always migrate them to a less loaded machine.

Cheers,
Mark

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