On 27/03/2020 15:27, Alexander Shenkin wrote:

Thanks Wol,

Booting in SystemRescueCD and looking in /proc/mdstat, two arrays are
reported.  The first (md126) in reported as inactive with all 7 disks
listed as spares.  The second (md127) is reported as active
auto-read-only with all 7 disks operational.  Also, the only
"personality" reported is Raid1.  I could go ahead with your suggestion
of mdadm --stop array and then mdadm --assemble, but I thought the
reporting of just the Raid1 personality was a bit strange, so wanted to
check in before doing that...

Always remember - provided you don't use a --force, it won't do any 
damange. Given that booting into a rescue CD didn't assemble correctly, 
it looks like --stop then --assemble won't work. You need to follow the 
instructions in "when things go wrogn".

Cheers,
Wol