Other than sdc (as you noted), the other array drives come back like this:

root@jackie:/etc/mdadm# mdadm --examine /dev/sda
/dev/sda:
  MBR Magic : aa55
Partition[0] :   4294967295 sectors at            1 (type ee)

root@jackie:/etc/mdadm# mdadm --examine /dev/sda1
mdadm: No md superblock detected on /dev/sda1.


Trying your other suggestion:
root@jackie:/etc/mdadm# mdadm --assemble /dev/md0 /dev/sdb1 /dev/sde1 /dev/sdf1 /dev/sdg1
mdadm: no recogniseable superblock on /dev/sdb1
mdadm: /dev/sdb1 has no superblock - assembly aborted

root@jackie:/etc/mdadm# mdadm --assemble /dev/md0 /dev/sdb /dev/sde /dev/sdf /dev/sdg
mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: /dev/sdb has no superblock - assembly aborted


Basically I've tried everything here:  https://raid.wiki.kernel.org/index.php/Linux_Raid

The impression I'm getting here is that we aren't really sure what the issue is.  I think tonight I'll play with some of the BIOS settings and see if there's something in there.  If not I'll swap back to the old motherboard and see what happens.

Thanks.
--RJ





On Wednesday, January 24, 2024 at 12:06:26 PM EST, Sandro [off-list ref] wrote: 





On 24-01-2024 13:17, RJ Marquette wrote:

When I try the command you suggested below, I get:
root@jackie:/etc/mdadm# mdadm --assemble /dev/md0 /dev/sd{a,b,e,f,g}1
mdadm: no recogniseable superblock on /dev/sda1
mdadm: /dev/sda1 has no superblock - assembly aborted

Try `mdadm --examine` on every partition / drive that is giving you 
trouble. Maybe you are remembering things wrong and the raid device is 
/dev/sda and not /dev/sda1.

You can also go through the entire list (/dev/sd*), you posted earlier. 
There's no harm in running the command. It will look for the superblock 
and tell you what has been found. This could provide the information you 
need to assemble the array.

Alternatively, leave sda1 out of the assembly and see if mdadm will be 
able to partially assemble the array.

-- Sandro