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There is a process for turning a BIOS-booting system into a UEFI-booting one, but it's quite fiddly, and (naturally) involves more downtime. At the moment, I expect this will happen this Wednesday, 20/3, and will probably last most of the morning, and possibly most of the day.
OK, well that didn't go very well. When I said "fiddly" I should have said "fiddly and incomplete". We're currently running off a single hard drive, so data must be considered at-risk. I hope to have a procedure tested for the BIOS-to-UEFI change by Friday, but that will depend on how much spare time I can muster. At the very least, I'll go back to the colo on Friday and reattach the second HDD (assuming I can make the mirroring work with it on, which is the current problem).
If I can't get a tested procedure, I'll have to reinstall the system from scratch. That should be quicker than the first time, since now all the CentOS to Debian migration is done, but it won't be instantaneous.
Sorry about all this.
- Tom