Had a set of drives with Stabebit Drive Pool on them.
Just for your Info really.
I had backed them up a a group and on an individual way because of the sizes of the JOBD set in my ProBox.
When I looked into it further I discovered an overlooked item.
Seems when DrivePool is fresh and few files are there all is fine.
When I used the Ordered File Placement to rotate my drives is when the problem crops up.
Drivepool does not check and delete all empty directories when the drive is at the bottom. It just creates a new empty folder in the upper pool
I have found thousands of empty folder strings from my long use. I would not have looked into if if my system hadn't baulked at moving a 20GB section to a drive that had 3.4 TB of free space.
I deduced that the system had become bogged down with all those empty directories on the drive.
When I used a program that would look for all empty directories on the drives and removed them. Then allowed Drivepool to remeasure and recaculate. The problem was fixed.
I also saw a great decrease in memory usage and faster speed.
I only acknowledge this because I am running Win7 Pro and I am sure all know of the EOL in Jan 2020.