If you're not willing to wait or you've fragmented the space with constant writes and deletes then you can force a real time defrag of the reserved space by converting the thin volume to a thick volume and then back to thin. It works, but to test it properly you have to understand how the process works which most people don't do initially and means they spend a lot of time inadvertently fragmenting space before they begin the test proper.
Once you've recovered the space your best bet is to just let the system run instead of trying to track and reclaim every last GB on an hourly or daily basis, over time the system will sort itself out. If you're really focused on tracking every last GB or have volumes thrashing space that causes large reserves, then you either don't have enough headroom in the system or your volume may not really be suitable for thin volumes, so go thick for those and feel safe.
Sorry not aimed at anyone in particular but : - is there value in some of these space reclaim questions and answers being made sticky in the forum ????
HP now have quite a few whitepapers available on this and there are multiple posts that cover the process at a pretty low level maybe start linking to them or create a consolidated post.
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