I found my problem … if operating system firewall was disabled I enabled the firewall NetBarrier, after i have set it without restriction Drobo Dashboard works fine.
However my Drobo FS never put into old… it is configured to stop after 15 minutes of inactivity but it doesn’t.
It´s probably configured to spin down the disks after 15minutes. However for some reason the fan wont stop for that reason. So the FS is still a noisy box when it´s not in use. Im looking into replacing the fan to make it 18db
I had the same consern as you so I sent a Diagnose file to support and they verified that the disk had spun down. The green lights indicate that the disk are healthy and not full.
I know it breaks the warranty, but it will become dead silent and is very tempting.