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My advice; contact support and send them Troubleshooter data. Christopher is very keen in resolving problems around the "new" google way of handling folders and files.

There is no appreciable performance impact by using multiple volumes in a pool.

Volumes each have their own file system. Moving data between volumes will require the data to be reuploaded. Only moves within the same file system can be made without reuploading the data, because only the file system data needs to be modified to make such a change.

This is part of the problem with the way that the SSD optimizer balancer works. Specifically, it creates "real time placement limiters" to limit what disks new files can be placed on. I'm guessing that the SSD is below the threshold set for it (75% by default, so ~45-50GBs). Increasing the limit on the SSD may help this (but lowering it may as well, but this would force the pool to place files on the other drives rather than on the SSD). Additionally, there are some configuration changes that may help make the software more aggressively move data off of the drive. http://stablebit.com/Support/DrivePool/2.X/Manual?Section=Balancing%20Settings On the main balancing settings page, set it to "Balance immediately", and uncheck the "No more often than ever X hours" option, it set it to a low number like 1-2 hours. For the balancing ratio slider, set this to "100%", and check the "or if at least this much data needs to be moved" and set it to a very low number (like 5GBs). This should cause the balancing engine to rather aggressively move data out of the SSD drive and onto the archive drives, reducing the likelihood that this will happen. Also, it may not be a bad idea to use a larger sized SSD, as the free space on the drive is what gets reported when adding new files. This is part of the problem with the way that the SSD optimizer balancer works. Specifically, it creates "real time placement limiters" to limit what disks new files can be placed on. I'm guessing that the SSD is below the threshold set for it (75% by default, so ~45-50GBs). Increasing the limit on the SSD may help this (but lowering it may as well, but this would force the pool to place files on the other drives rather than on the SSD). Additionally, there are some configuration changes that may help make the software more aggressively move data off of the drive. http://stablebit.com/Support/DrivePool/2.X/Manual?Section=Balancing%20Settings On the main balancing settings page, set it to "Balance immediately", and uncheck the "No more often than ever X hours" option, it set it to a low number like 1-2 hours. For the balancing ratio slider, set this to "100%", and check the "or if at least this much data needs to be moved" and set it to a very low number (like 5GBs). This should cause the balancing engine to rather aggressively move data out of the SSD drive and onto the archive drives, reducing the likelihood that this will happen. Also, it may not be a bad idea to use a larger sized SSD, as the free space on the drive is what gets reported when adding new files.