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New install of ESXi 6.5 creates VMFS5 datastore instead of VMFS6 !! To upgrade the ESX boot datastore to VMFS 6 version, please follow below steps !! 1. Note down the NAA ID of the data store. 2. Put ESX host into maintenance mode. 3. Unmount the data store from ESX host. 4. Delete the data store from ESX host.. 5. Go to ESX host and choose New Datastore option and re-add the same data store.  6.Choose type VMFS, give name, choose VMFS 6 version this time and finish the wizard. 7. Successfully upgrade the data store to VMFS 6.

How to upgrade the ESX data store from VMFS 5 to VMFS 6. Upgrading the VMFS 5 data store to VMFS 6 is quite simple. Follow below steps:- Note:- Before upgrade the data store  to VMFS 6 make sure all ESX host has been upgraded  to ESXi 6.5 version . 1. Migrate all VMs from the data store to another data store. 2. Move all ISO/Orphaned data from data store to another data store if exist. 3. Note down the NAA ID of the data store. 4. Unmount the data store from all ESX hosts. 5. Delete the data store. 6. Go to any ESX host and choose New Datastore option and re-add the same data store.  7.Choose type VMFS, give same name as earlier, choose VMFS 6 version this time and finish the wizard. 8. Successfully upgrade the data store to VMFS 6. 9. Move back the VMs to this data store.