Hardware :: RHEL 5.3 On Bladecenter With GPT Disks

As stated in the subject line, we have an IBM BladeCenter (HS22). Some of these Blades are supposed to have Windows Server 2008, some RHEL 5.3, and some a dual boot of both. The WS2008 only installs have gone just fine. However, when I went to do one of the dual boot machines (the next highest priority), I ran into problems. I did the Windows install, then went to do the RHEL. Told the installer where everything should go, like any other time I've done this (although usually on less swanky machines). Then got an error:"Your boot partition is on a disk using GPT partitioning scheme but this
machine can not boot using GPT.

This can happen if there is not enough space on your hard drive.The error must be corrected before you try to install Redhat Enterprise server. "To be honest, this was the first time I'd heard of GPT (or EFI), as I've been out of hardware/installs/etc... for a few years, other than fiddling at home in between coding projects.

So I've done some research, and so far what I'm seeing implies that the RHEL 5.3 kernel should support GPT. But that perhaps the issue is the Anaconda installer (specifically its partitioning tool). Does this sound correct? So is there a RHEL release out there with a different installer/partitioner? Or if I use a different tool to partition first, would that work? The disks aren't large enough to *require* GPT, but that's how they are by default, and down the road it'd be nice to know how to work with that, to keep things consistent. Also, the dual boot with WS2008 is much easier with GPT, as that version of Windows seems to require it.If anyone has any thoughts/confirmations/assertions that I'm horribly wrong on the above questions, or any tips on the dual booting other than that (since I'm guessing the logistics will now change with EFI from what I'm used to on older systems), it is vastly appreciated.