Hmmm, never tried this, but how I think it should work in my head is that there no point in running the UNMAP command in VMware as an drum is simply a pointer file, nothing more so it's only taking up kb on the vmfs datastore, especially with physical mode, VMware has no control over it at all, it's simply a facilitator to pass it through to the vm.
I can see sdelete working, have you tried some different switches on the command, isn't there a -c and -z?
I think it's the -c option you need....possibly....I always get confused between the two, especially as you would think -z stands for zero, but it think it's the other way around.
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