[cobalt-users] Advice on how to relocate a server?

["Ben Liddicott" <ben.liddicott@xxxxxxxxxxxxxxxxxx>]

We will be relocating two Cobalt RaQs to another datacenter very soon, and I'd be really interested in anyone's advice on how best
to do it.

Thus far my plan is:
 *  Announce planned downtime, about four hours from 0:00 sunday to 4:00 sunday of the chosen week.
 *  Install additional RaQ in new datacenter, configure it as DNS primary for all sites where we control DNS. Inform others of our
intended move time and new IP addresses.
 *  Cut DNS TTLs on our sites to about an hour, a couple of days in advance (perhaps in stages)
 *  Rip out the servers from the old datacentre. (point of no return).
 *  Stick the servers in the new datacentre, configure new IP etc. via LCD.
 *  Run script to change IP of all virtual sites to new IP via SSH. Test sites.
 *  Increase TTLs again.

Any reason why that won't work? Have I missed anything?

The other obvious method involves installing a server in the new datacentre, then migrating the sites over to it one by one. That
involves more labour while avoiding some of the downtime, but are there any other advantages or disadvantages?

Cheers,
Ben Liddicott