Hello,
Perhaps proprietary firmware is the cause of your software problem -
strangely you failed to provide any information about the most likely
cause.
Well, thought about that, but that hardware is working fine for over one year
with daily dist-upgrades and even if I boot with debian installer, all disks
are recognized and working.
The real problem is, that the order of the drives changes on every boot, or
let me say - it's indetermined, how the order of drives will be after next
boot.
Even in rescue mode things are quite strange. When I i.e. have to select
/dev/sda1 as root device, after opening a shell for that root partition, a cat
/proc/partitions shows the partition as sda1 but a df states, it is /dev/sdd1
So stuff around naming of devices and partitions is quite wired.
As to your main problem, ...
I admit, my main problem is mostly ideologic, but isn't it a rule of debian
stable, that no update will break a running system?
The last update did break my system.