You write "storage device incorrectly reporting...". Please give an example. What numbers do you expect? Why? What numbers are you seeing? Exactly because of what is highlighted in red "GPFS does not communicate block deallocation events...." -- I would not expect deleting files to change "storage device report [of]... usage allocations". The device saw GPFS write to some data blocks and ... nothing after that ... so the device still "thinks" those blocks are in use. Indeed GPFS may re-use/re-write those blocks in the future when they become part of another file" OTOH GPFS may not do that until it has written to every other block that is addressable from its point of view. GPFS has no idea that the thin provisioning layer exists and might favor re-using one disk address over using another.
See also https://en.wikipedia.org/wiki/Trim_(computing)
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