Plex Media Server Unable to see Library on Raid

Plex works well with a RAID or regular HDD/SDD.

The “magic” is making sure you setup the mount correctly.

  1. Don’t put content in your /home directory. Home directories usually have more restrictions.

Using what you’ve shown, I recommend this:

  1. Create a separate mount point directory (e.g. /Snail)
  2. Make yourself owner
  3. Set directory permissions 755 so you have full control and Plex has read
  4. Now mount the RAID logical drive on /Snail
  5. Again set your username as owner
  6. Again apply 755 permissions

It would look like this in the shell (edit this to match your username and mdadm volume ID)

# Mount point directory
mkdir /Snail
chown jj48642:jj48642 /Snail
chmod 755 /Snail

# Now mount the array
mount /dev/md2 /Snail
chown -R jj48642:jj48642 /Snail
find /Snail -type d -exec chmod 755 {} \;
find /Snail -type f -exec chmod 644 {} \;

# Now edit /etc/fstab to   (adjust this to match)
/dev/md2  /Snail  <FS_TYPE>   auto,defaults,rw 0 0

Please see here for more details.
The tip shows ext4 but works for anything supported by Linux
( I use xfs – more robust for large arrays like mine )