In a MONTH? This is going to be tough! Ideally, this planning should have started 6-12 months ago. However, here are some things that might help.
Is the new data center complete? Do you have any details on its design? Or have you been given a street address and a large room?
Do a Google search for "Move Data Center Checklist" without the quotes - there are a number of good links that pop up.
The first things that come to my mind are:
- All network infrastructure in place and tested prior to any moves. If you can't because it will use the same equipment already in service, then you'll have to cable the new place with cardboard boxes mocked up where each piece of equipment goes.
- All air conditioning, backup electrical power, power conditioning, fire suppression and other "facilities" type stuff in place and working.
- All racks and other furnishings in place. Don't try to save money by moving everything at once, it will be a disaster. As mentioned above, mock up ALL equipment, with all cables in place.
- If you can't get everything in place, then get as much of the "facilities" and "furnishings" in place, and tell your boss that there is going to be significant downtime due to failure to plan and budget in advance.
- Is there any chance of temporary connectivity between the new and old data centers - you didn't say how far apart they are geographically. It might be possible to set up laser links, string cable or fiber depending on the distance. With 1 month to go, you can forget anything involving the telephone company. If the new site has Internet connectivity, set up an office-to-office VPN tunnel to ease the transition.
If you can get the connection described above, then you can "stage" the move by grouping related equipment and moving it together to minimize overall down time.
Also plan on working nights and weekends.
This is a lovely topic, but I'm short on time right now myself.