Check for blocks that could be reclaimed

I know use can reclaim deleted blocks but can you check to see how many "deleted blocks" exist on a datastore?
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compdigit44Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I believe thats' the function were are all waiting for.....

check to see how many deleted blocks, or what the space saving would be if we run the UNMAP command.

I've seen many scripts, which are run across datastores, relcaimining storage, but to date, I've not seen a script, which can display, how much would be reclaimed before the script (unmap) is executed.
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compdigit44Author Commented:
Interesting...

I wonder what would happen if you have the unmap command using powershell with using "whatif"
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Did you read this Deep Dive on Reclaim and Unmap ?

http://www.boche.net/blog/index.php/2013/09/13/vsphere-5-5-unmap-deep-dive/
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compdigit44Author Commented:
Interesting article... Maybe we will have to wait and see what surprise with exist in ESXi 6
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Lots of work is being done in this area by Vendors, with VAAI plugins, and reclamation.
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