Re: Adding Raidframe to existent GPT system

[Martin Husemann <martin%duskware.de@localhost>]

On Mon, May 09, 2022 at 10:01:47AM -0400, César Catrián C. wrote:
> Got three drives, two for a RAID-1 array and one more for backup. 

You need a GPT like this on the two disks for the array:

 # gpt show wd0
        start         size  index  contents
            0            1         PMBR
            1            1         Pri GPT header
            2           32         Pri GPT table
           34         2014         Unused
         2048        65536      1  GPT part - EFI System
        67584  11720976384      2  GPT part - NetBSD RAIDFrame component
  11721043968         1167         Unused
  11721045135           32         Sec GPT table
  11721045167            1         Sec GPT header


(identical for wd1). Then you will get two dkN devices that correspond to
the "NetBSD RAIDFrame component" partition, e.g. I have dk0 and dk2 for
the two EFI partitions, and dk1 and dk3 for the two raidframe components.

You can list these via "dkctl wd0 listwedges".

You then create the raid from dk1 and dk3 and initialize it, this gives
you a "raid0" disk.

Then you create a gpt on raid0 (e.g. putting a FFS and a swap partition there).

The two (identical) EFI partitions are not strictly needed (one would
do), but my theory was to allow booting from either disk if one of them
fails completely.

Martin