Compacting a bin zone

Some write (if overwriting a bin is required) and delete operations remove references to the affected bin, making the contained data inaccessible. The unreferenced bin still occupies space in a zone. The process of removing unreferenced bins from zones is called compaction. It is executed in the background without disrupting regular storage functions. Compaction occurs more frequently when disk utilization is close to 100% to reclaim unused space more quickly.