Raid started with 4 out of 5 drives

  • Hello.

    My raid went suddently missing.. I googled some commands regarding a missing raid and I managed to start the raid again with mdadm --assemble /dev/md0. But..

    mdadm: /dev/md0 has been started with 4 drives (out of 5).

    My sdf drives wont start. mdadm: no RAID superblock on /dev/sdf

    SMART says nothing is wrong with the drive. How can I get superblocks on again and what is it?

    Thanks in advance.

  • Okey, I found out that I could "Recover" in OMV GUI under Raid management. Now it's clean again and running with 5 drives. But I keep getting emails from the NAS about the raid and my NAS is running slow. The connection is falling out sometimes and my Plex is lagging.

    How can I fix that?

  • "A SparesMissing event had been detected on md device /dev/md0."

    Output from mdadm.conf file:

    Is the definition correct or why do I keep getting emails from server?

  • Do you have a spare?
    Do you know, what this means?

    A short search revealed:
    Remove the "SparesMissing event"

    Thanks for your answer. I guess I should have searched better before creating last post.

    I guess a spare means another HDD ready to kick-in, in case of another HDD failure? I do not have this, so I changed the spare=1 to 0.

    I guess the problem is fixed now. But my performance issue for the server in general is likely not.

  • Correct for the spare.
    For the performance issue, you should search for guides.
    Isolate the problem. CPU (top), IO (iotop or copy a file on the command line), network (iperf), ...

    Yes I did see it. I will search for guides.

    Long story short. The server used to run without problems, but suddenly when I put "pressure" on the nas by adding torrents and moving files, I lose connection to the GUI and bittorrent for a while. But my plex server keeps running without problems even that I cannot log in or change page. I did some updates in the GUI a while ago. Other than updating and fixing the raid, I havent done anything else..? I also have added more RAM to the motherboard because I only had 3GB. But that was already when the problem was here.

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