Some weeks ago, someone on this forum introduced me to the wonders of LVM. For that, I am greatful. Until now, I hadn't had the time to work on setting that system up. I have now begun doing so step by step. Well, today I was creating the partitions I needed when I noticed that there is a specific partition id for LVM. I am a bit confused because it seemed to me from what I read that pvcreate will work on any type of partition and even on software RAID devices. So, should I use that partition id or is it something old that is no longer necessary? If I do need to use that partition id, what do I do about the software raid devices Im going to include in a volume group (since RAID has its own partition ID)? Thanks for your help.

if you are using software raid and want to create a PV on /dev/md0 then you are doing so outside of the disk partition scheme, so it doesn't matter. partition types are often irrelevant, as most often linux will actually look at the filesystem directly to see what it is.