I've got an older dual PIII dell that had a pertec RAID card and 4 18GB SCSI disks.

Kubuntu did not see the RAID card.

I yanked the card, and plugged the disks into the MB base AIC adapter.

When installing, I wanted to try to software raid 5 or mirror the disks. Major unhappy, raid 5 would be a complex partition level slice and dice, screw that. I tried LVM, but got lost after enough reboots and error messages saying the kernel did not understand the new setting, etc.

So, at this point, I've told it to use the 1st disk and auto setup the LVM. This left me with a non-LVM /boot, and / (root) and swap LVM partitions.

I figure I can add in the other disks and setup mirroring on the partition level later, as well as add addititional partition (/tmp, /var, /home, etc)

Don't:
#1 - Create an LVM root paritition on a single disk
#2 - Create a 3 disk md RAID5 set.
#3 - Add that set to the volume group.
#4 - attempt to remove the original disk holding the root partition, hoping for a clean migration.

Hard hang.
On reboot, drops be to busybox shell with LVM error messages.

Oh well.

I was under the impression that RAID functionality was part of LVM and I should be able to setup mirrors to other disks using it.

But then various web reading leaves me to believe I might have to deal with the md driver at the same time.

I'm a bit confused.

Can someone point me to instructions on adding a mirror to an already created root partition, or tell me it can't be done so I can stop wasting my time.