You can try and figure out what's accessing the array:
fatrace | grep /mnt/mountpoint/
This will show you the process, type of access (read, write, open, etc), and path. If you don't see anything right away just leave it running for a bit.
You can try and figure out what's accessing the array:
fatrace | grep /mnt/mountpoint/
This will show you the process, type of access (read, write, open, etc), and path. If you don't see anything right away just leave it running for a bit.