We run a B800i with 8 slots, 2 are free and 6 have 4tb drives. Because of software limitations, we broke the 24tb capacity into a 16tb volume and an 8tb volume. We are getting a red light on the first open slot (the occupied slots are all green), and a warning in the Dashboard saying it’s running very low on usable space. In the Capacity screen, it shows 17tb used, 250gb free. In the Volumes screen, the 8tb volume shows 1.4tb free, and the 16tb volume shows 5.5tb free. We’ve had issues for the past couple of days with some backup jobs (Veeam) running extremely slowly (4MB/s processing rate). Normal rates are around 20MB/s. I updated the dashboard to the most current version 3.5.0 
Any ideas? I hate to order and install an additional drive for the 7th slot if we already have plenty of free space available.