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Thread: RAID6 degraded, need Help..

  1. #1
    Join Date
    Nov 2019

    Unhappy RAID6 degraded, need Help..

    Today decided to add 5th drive to the RAID6 array for storage expansion.
    The disk appeared in fdisk -l, also i double checked the state of raid after booting with extra drive, and it was clean with 4 drives. i’ve created needed partitions on the new drive, added to the mdadm. At this stage 5th drive suppose to stay as “spare”, but i’ve noticed very strange situation. Instead of 4 healthy drives and 5th as a spare, i found that 3 drives are healthy, 4th drive is re syncing after degradation, while 5th drive (not the one i’ve added) is faulty. Would be not that bad, but… for doing this upgrade i took the server out of it’s place and lie on the desk. Before leaving server room, i accidentally moved a bit server case a few centimetres (as i left it on the desk) and power cord popped out…

    Now i have “error: ELF header smaller than expected, entering rescue mode”.

    I’ve tried over the grub made these steps:

    set prefix=(md/1)/boot/grub
    set root=(md/1)
    insmod normal (after this command i get: ELF header smaller than expected)

    Then i’ve tried “Boot repair”, but for some reason i can't see the button "Recommended repair", i only can make a report.

    This is boot repair info:

    Any ideas for this repair are very welcome.

    Thank you.

  2. #2
    Join Date
    Mar 2010
    Ubuntu Mate 16.04 Xenial Xerus

    Re: RAID6 degraded, need Help..

    I've never used RAID6. There might be a way to address this but if it has been over a day, I'd wipe all the disks, recreate the RAID set I want using all the disks, then restore from backups.

    RAID never replaces backups and sometimes the easiest answer to RAID problems is to start over using backup data.

    Boot-repair only works for trivial storage situations. I've never heard of it handling RAID-anything.

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