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On 29/06/2022 04:10, Ram Ramesh wrote :
> 
> Note that you need GPT for UEFI boot disk.

This is only a requirement for Windows (and possibly broken UEFI 
implementations). The UEFI specification allows to boot from a drive 
with a DOS/MBR partition table. Else, assigning a DOS/MBR partition type 
code for EFI system partition (0xef) would be pointless.

> On 6/28/22 20:05, Alexander Shenkin wrote:
>> Once I installed a graphics card, I was able to enable CSM and I've 
>> booted successfully.  Thanks everyone for your help. Converting to 
>> UEFI would be a good idea, though not sure how easy that will be given 
>> that /boot is a RAID1 array (how do you resize all the partitions, etc?).

Setting up redundant EFI boot with software RAID is a pain and a hack.
Resizing RAID partitions is a pain.
So I advise you keep legacy boot as long as you can (but prepare for EFI 
boot on a test machine or VM).