What is VMFS?

Hi, VMFS 6 datastore came with vSphere 6.5, but there are some changes here. VMFS 6 has a partially different structure. There are a few changes compared to VMFS 5. I was actually expecting this variation in vSphere 6.0, but it came in vSphere 6.5. However, I would like to give a brief explanation. If you pay attention to the article in which I wrote the differences between VMFS 3 and VMFS 5, we could upgrade online from VMFS 3 to VMFS5 datastore. However, we will no longer be able to do this ...