VMware presented a new version of the VMFS file system with the vSphere 6.5 release. Read the VMFS 5 vs VMFS 6 comparison to learn the differences between the two and understand the features in the newer version.
You’ll also learn how to upgrade VMFS 5 to VMFS 6 in the GUI and command line: https://www.nakivo.com/blog/vmfs-5-vs-vmfs-6