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I am on Linux Mint 18.1 with 4.8 kernel.

Question is: How to check (mdadm) software RAID array, if the e.g. the swap file is on it?

I need the correct procedure before and after calling the checkarray script to define proper alias.

  • You just do. No need to swapoff or umount. Not sure what gives you that idea. – frostschutz Mar 24 '17 at 11:07
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In this example the array is called md0 and it's mounted in /raid1.


Check array alias:

  1. Supposing a swap file is located on the array, we need to turn it off first. If that is the only swap area on the system, we can do:

    sudo swapoff --all
    
  2. The array needs to be unmounted in order for it to be checked properly:

    sudo umount /raid1
    
  3. After this preparation took place, we may call the checkarray script, I chose fast priority, but you may choose any priority option:

    sudo /usr/share/mdadm/checkarray --fast /dev/md0
    
  4. If you wish to watch the progress of the array check every second:

    watch -n 1 cat /proc/mdstat
    

So the complete bash check array alias located e.g. in your personal .bash_aliases file would look something like:

alias checkarray='sudo swapoff --all && \
                  sudo umount /raid1 && \
                  sudo /usr/share/mdadm/checkarray --fast /dev/md0 && \
                  watch -n 1 cat /proc/mdstat'

Make sure you close all open files on the array before calling it.


After-Check array alias:

I think no further comments needed:

alias checkarray-after='sudo mount /dev/md0 /raid1 && \
                        sudo swapon --all'

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