Phil, following all your advice, the server's mounts are coming up,
RAID1 is synchronised, and /home is usable (and used); the machine is
working.
While updating the initramfs, the update routine logged:
mdadm: /dev/md5 - no such device
(or something similar, I've lost the screen since a reboot)
I reverted to referring to the array as /dev/md126, in both
mdadm.conf, and in fstab, and the initramfs update complained about
that, as well. So I left it as that, and rebooted.
Reboot was perfect. Now all the /mdXs are up, with one labelled as
/dev/md126, but that's ok, it's the same in the .conf file as in
fstab. The fstab had a number of redundant entries from periods when
there were other discs also in the machine, so I cleaned those up, as
well.
On, now, with the rest of the Debian upgrade. Again, very many thanks
for your help and patience.
regards, Ron
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