I found the problem, the Management Software defaults to base10, while the servers accessing the datastore default to base2. Matching the bases removed the discrepancy.
I am configuring a Dell EMC PowerVault ME4 4024 with 10 11tb drives, using RAID6. In the management software it shows that we have 88tb available, the expected 20% reduction, but when the ME4 is mounted as a file system only 86tb is available. We have a similar issue with our ME 4084, where a pool with 125tb available storage only 114tb is usable when mounted. We have some 3xxx units as well, that do not have this storage loss. The server we are using is RHEL7.7
Why does my EMC PowerVault ME4 4024 not provide the correct amount of storage?