NAS542 lost RAID5 after repair

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  • Mijzelf
    Mijzelf Posts: 2,894  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary

    What's wrong?

    Don't know. Invisible typo somewhere, I guess. Does

    ls /tmp/

    show the file?

    The /tmp directory is on a ramdrive, so it's content won't survive a reboot.

  • indiana1938
    indiana1938 Posts: 13
    First Comment Friend Collector
    edited March 2023
    https://community.zyxel.com/en/discussion/comment/49694#Comment_49694

    That's it, copied again and started process.

    ddrescue informed me to add "—force" to the command line, so I added it and process is running now.

    When copy process is done, what will be the next steps?

    • Removing currend disk from slot 1, putting disk from slot 2 into slot one
    • Replacing disks back into slot 3 and 4
    • Putting one of the new disks into slot 2
    • Restart repair process on NAS via web interface

    Correct?

    Btw., the process will take some more time I guess. ;-)

    image.png
  • Mijzelf
    Mijzelf Posts: 2,894  Guru Member
    250 Answers 2500 Comments Friend Collector Seventh Anniversary
    Answer ✓

    Correct?

    Nope. The procedure is

    • move new disk 1 to slot 1, and add new disk 2 and old disk 3 and 4.
    • Check if the 'disk name'/'Device Role' mapping is the same as in this post. That is expected.
    • Re-create the degraded array with 'mdadm —create' like you did before.
    • Reboot
    • Restart repair process

    Btw., the process will take some more time I guess. ;-)

    It's not running at 80MB/sec, as I expected. Instead it's 'just' 50MB/sec. But the 'current rate' is lower. Maybe that disk has more problems than I expected from your problem description. On your screen shot it has 3 read errors in the first 66GB, while I was hoping for 1 on the whole disk.

    BTW, it seems the 'current rate' is used for expected remaining time. At 50MB/sec it should be 11 hours, at 26MB/sec it's 21 hours.

  • indiana1938
    indiana1938 Posts: 13
    First Comment Friend Collector

    I completed the process and …. tadaaaa!
    All data are still present and seved to a separate disk.🤗🤩

    Thank you so much for your kind support and patience on a noob like me. 😉

    Will send you a separate message later.

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