Am 29.01.20 um 04:17 schrieb Ram Ramesh:

I have my entire debian 9.0 installation (root/usr/home etc) in two nvme
RAID-1 mirror. Is it possible to break them in to two degraded arrays?

Specifically I want to do this.

1. Break current debian 9 full RAID1 into two degraded RAID1 A & RAID1  B
2. Boot only A and upgrade to debian 10 and make sure it works
3. If it works, add B back into A and get Debian 10 in fully complete RAID1
4. If it does not work, I boot B and add A back and get back debian 9
   in full working RAID1

i would simply remove one disk completly and in case i want to keep the
upgraded system wipe it and resync afterwards or when i want back to the
old one put it back and wipe the modified

full resync, done