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Trapped space does not count against licensed capacity.
Do not think that trapped space is costing money or indicating Trapped space neither counts against licensed capacity nor indicate a problem; it is an inherent feature of Swarm clusters and is not counted as space used.Non-trivial portions of disks may appear trapped.
This is normal and is not cause for alarm. The HP is constantly monitoring to intervene if trapped space grows too large and it takes a long time to fill a cluster. Whatever space is trapped one week is free and available another week, with different trapped space being generated. It all depends on the cluster use.As disks fill, defragmentation churn must increase.
Swarm seeks to maintain 20% of space free with the ideal ratio of 0.8. Nearly full disks have to defragment frequently to keep this ratio, creating a higher background load on the cluster.A cluster filled to capacity can choke on trapped space.
Swarm is designed to maintain and heal itself as long as it has free space to work with. Running near capacity defeats these mechanisms. Trapped space can generate faster than can be reclaimed rare use cases. Contact DataCore Support if this problem is encountered.