HP SATA Hot Plug Activity Light & B120i Array Controller

The activity rings on both of my hot plug drives rotates continuous (they are in RAID 1 configuration). The drive status on both is solid green.

Is this normal? The iotop command is showing no activity... Total Read/Write zero B/s.

Edit: However, I'm not sure if I'm using that command correctly. Just SSH'd while I had iotop on, it didn't pick up a file write...

Any advice would be great.

Thanks.

Whether there's read or write activity, the drives are still online and spinning!

Edit: This may just be a function of using the Dynamic Smart Array driver (hpvsa module).

HP explains the drive functions here.

Please also see HP's video detailing their SmartDrive disk carrier.