I have a DL380 G8 with a P420i raid controller. 2 RAID1 logical drives have been setup - one containing the OS (CentOS7) and one made of a single almost empty partition (contains a single tiny text file - it is a test machine at the moment).
The HP trays are meant to show activity, failures, etc. The OS logical drive trays do act seemingly normally (sometimes show activity, sometimes don't), but that second logical drive shows constant activity (the "ring LEDs" keep on moving around) even though there is no real reason for it to show activity as it contains a text file that no process is using at any time.
A few "failure tests" (removing a disk while running) show that otherwise the trays work correctly in showing a degraded array, etc.
The question is simply : what's going on?