RAID5 from a NAS with an unclear array marked as clean, degraded

  • Hi!
    Because I'm a (long time) debian user (and Herbert's Dune fan :thumbsup: ) I replaced the original OS of my NAS with OMV : Now, I'm using 0.5.53 on my N4100Pro Thecus NAS. This NAS contains all my pro and personal files and I'm replacing the discs (almost) every 25%.

    In short, my two firsts replacements took place under ThecusOS when I reach 25 and 50% of the capacity of my RAID, then, my third change was delayed to 80% and when I reached 90%, I was unable to upload any files on my NAS.
    So I used Slax, debian and OMV to tests my NAS and it appears that it comes from the original OS, so I moved to OMV... And I went back on with my third old disc, at this point, I have 2x4TB and 2x1TB in RAID5.

    Now, I've reached 95% and I wish to change my last two harddiscs, but I just seen something odd in my RAID management when I changed (again X/ ) my third disc.
    In the RAID Physical disks, I can see the new WD Red 4TB (/dev/sdb)

    But when I go to RAID management I see two RAID5, one /dev/md126 with the name of my NAS but with a level indicating "Mirror" and the good one under /dev/md127, named N4100PRO...
    When I changed the third disc, I assumed that I have to recover with the good one, so I used the GUI, and it worked... almost...

    As you can see, now my "good" RAID is clean, but I still see this "Mirror"-thingy and it's flagged "clean, degraded" with no sdb ?(
    When I look into the mdadm.conf I see this :

    root@GrosNAS:~# grep ARRAY /etc/mdadm/mdadm.conf
    ARRAY /dev/md/N4100PRO:1 metadata=1.0 name=N4100PRO:1 UUID=1a12e8ed:41bf690a:fd685af0:2fa21703
    ARRAY /dev/md/GrosNAS:0 metadata=1.0 name=GrosNAS:0 UUID=b19d0be0:cafb3ec2:1ef505be:a92fab46

    I'm starting to doubt... My first tought was "OK... Perhaps OMV is showing me the "parity part" of my RAID5", strange indeed 8| , but why not...
    Then, I see the capacity... :S
    Now, my thought is "Hmmm... Perhaps my ThecusOS was a little more fµ©ked :cursing: than I had thought..."
    I think perhaps it is the "system" part of the old OS, since they used a tiny 128MB Disk-on-Module... Dunno...
    I'm quite dubious :|

    My questions are :
    Can I remove the GrosNAS line of my mdadm.conf ?
    If yes, can I rename the good array with the good name ?
    If no... WHAT CAN I DOOO ?? ;(

    Sorry for the long post, and thanks in advance.

    N4100Pro - OS: OMV 0.5.60 - RAM: 512MB - Capacity: 12TB RAID 5 - FS: XFS

    Edited once, last by PsyKo ().

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