Caution / disk status bad

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX4
#1

Hi there,

I got a “caution” message on dashboard and a purple LED on one disk.

This makes me a little worried so I checked, and SMART status seems ok (raw values), and the RAID 5 status says [UUUU] in ssh…

Why the UI says that the Disk Health is Bad then ?

Any help appreciated