Thanks to you and all other answers. It helped me a lot to understand the backgrounds. On 2021-01-01 14:09 Phil Turmel <philip@xxxxxxxxxx> wrote: > I recommend creating an mdadm.conf file containing ARRAY entries for > your desired setup. Trim those lines to only have the desired name > and UUID. Maybe I should open a new thread for that topic? Please correct me, because I am not an usual admin nor an mdadm expert. I do not want to convince you with the following! I just want to bring up my point of view and my opinion to make it possible for you experts to "correct" me. ;) I do not see the advantage of creating mdadm.conf. Via fstab I mount the devices by their UUID. And all other information's mdadm needs to use the RAID is stored in the superblock. So information's in mdadm.conf would be redundant. And especially for a non-routine home-admin like me each conf-file I modify keep the possibility of misstakes/missconfigurations and more problems. Keeping it as simple as possible is very important for my environment. > Once you are sure it works, I also recommend adding AUTO=-all to > mdadm.conf, so any extra arrays you might plug in temporarily won't > auto-assemble if still plugged in during boot. I do not understand this. What does "auto-assemble" means? You mean if I plug in a SDD/HDD with a mdadm-created superblock?
