On 21 March 2010 18:26, Graeme Gemmill [off-list ref] wrote
some stuff....

Some RAID expertise would be very welcome!

I'm no expert... but I think you need to do the following:
mdadm --stop /dev/md127
mdadm --zero-superblock /dev/sd[a-c]
mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sda1 /dev/sdb1 /dev/sdc1

All the best,

T