Hello nekalyan, Here is a link to Dell EMC PowerVault ME4 Series and Microsoft Hyper-V, I would double check to make sure that you have deployed your system to best practices as stated in this guide.  If you are still seeing a loss of 1.7 TB then I would look into Microsoft issue. [URL] Please let us know if you have any other questions.
Hello. I have a problem with pool capacity presented to hyper-v hosts I got recently installed and configured new PowerVault ME4024 storage with 12 SAS SSD 960GB and 12 SAS HDD 1,2TB.I've created 2 disk groups: 1-st with all SSD's and 2-nd with all HDD's.Each RAID6 with dedicated hot spare. So total capacity should be around ((12-2-1)*1,2+(12-2-1)*0,96) 19,44TBThen I've created pool of these two disk groups, and then a volume from that pool (full size).The volume shows total capacity of 19,3TB just as it should.But when I presented this pool to a hyper-v host (Win Srv 2019 Core) it shows 17,6TB capacity So there's 1,7TB missed somewhere. But where?... Or should I ask on MS Tech forum?  
Where is my space?