I need to start clearing some of the "trapped" space on my compellent volumes from moving and deleting VMs.

If we can assume most of my allocated blocks(that need to be zeroed out with UNMAP) are simply in replays that keep getting coalesced, how can UNMAP work---as these blocks are frozen? Will it zero out the block in the active replay--then I need to wait to the next replay to reap the savings?

A bit confused.