I've now experienced this behavior on two machines and expect it will occur on all future servers I install. So I'd love to find a better solution.
I'm trying to install Fedora using PXE kickstart on an R210 II with two disks. My kickstart detects that there are two disks and establishes an LVM volume spanning both of them. The kickstart completes normally but when the unit reboots, the screen goes dark and nothing happens. After some trial and error, I've found that it is trying to boot from the second disk. Of course, the boot loader is on the first disk so this fails.
My current workaround is to enter BIOS setup, disable the second disk, reboot (which starts properly but fails when the full LVM can't be found), go back to setup and re-enable the second disk, then boot again. From then on, the unit continues to boot from the first disk as it should, even if I repeat the kickstart installation. But this manual process will severely impact any attempt to install on a large number of machines in an automated way.
I've been unable to find anything in setup which seems related to this behavior. Ideally, I'd like to make any required BIOS setting at the same time I enable PXE on one of the interfaces. But if I have to modify the kickstart process, that will also work.