Twinned Hosting

[Dan Ros]

On Fri, Apr 17, 2009 at 7:38 PM, Julian Price <clug at jul17pri.co.uk> wrote:
>>> To be honest I don't quite get what it's about. Sounds interesting
>>> though.
>
>> It needs a diagram really.
>
> I have added a diagram to my 'Twinned Hosting' article at...
>
> http://www.julianprice.org.uk
>
> ...and rewritten it to make it more readable, hopefully.
>
> If you are interested in rock-solid low-to-medium traffic web-hosting for
> dedicated PCs then please give it a read.
>


Few things:

If a server fails, it might well have been fixed by the time the
administrator has noticed, changed the DNS, and the changes have
propagated,

Also, only having occasional rsyncs will mean you may still lose data
if a server goes down. And a server going down in the middle of a
rsync to its mirror could have messy consequences... DRBD might be
interesting for you to look at.

A safe way to do this with VM's is to use the built in
replication/failover features in Xen/VMware. You do tend to need a SAN
though. Plus BGP multi-site as has been mentioned already.

By the way, what did you use to make the snazzy diagram?

Dan