Datacenter exit with a deadline

A datacenter exit with a deadline is the most honest project in modernization. The lease ends, the building closes, the date does not care about your roadmap. We like these jobs. The deadline makes decisions that steering committees cannot.

Direction matters less than discipline. Some estates exit to cloud; a visible contingent now exits from it (37signals finished theirs in 2025, deleting the AWS account outright and banking seven figures a year). Either way the mechanics below hold. The building is closing. Everything inside needs a next address or a funeral.

Sequence by the only sort that works under a date:

1. Week one: the inventory, ruthless edition. Every workload gets one of four stamps: MOVE (lift it), REPLACE (the move is the excuse to modernize; ration these, they eat calendar), RETIRE (decommission now, the deadline is your permission slip), or DEFER-WITH-CASH (colo the stragglers month-to-month; expensive, and priced to be).
2. The easy 20% moves first, in month one. Static sites, brochureware, the portfolio-class workloads: Art Nikitin's website moves in an afternoon and proves the pipes, the DNS process, and the change tickets all work while the stakes are lawn-chair low.
3. The scary 20% gets named in week two, not month eight. The database with the SAN dependency, the licensed appliance, the box nobody owns. Each gets an owner and a fortnightly date with the plan. Deadline projects die from politeness about the hard items.
4. Everything else pipelines in between, batched by dependency cluster, not by department. Systems that talk nightly move together or latency finds you.

The deadline arithmetic to tape to the wall: capacity is moves-per-window times windows-remaining, minus the rehearsals you owe the scary list. Run the numbers in week one. If they do not close, you want the colo contract or the lease extension conversation now, at negotiating leisure, not in the final quarter at distress prices. The rollback plan also changes character near the end: after the racks start leaving, "roll back" means "roll forward differently." Know which weekend that line gets crossed, and rehearse accordingly on the last workloads that still have a home to return to.

One more thing the date buys you: an honest retirement rate. Estates exiting under deadline routinely retire a fifth of their workloads instead of moving them, because paying to relocate a thing nobody uses finally looks as absurd as it always was. Take the gift. The best migration is the truck that never gets loaded.