i migrated vcenter and esxi from 5.5 to 6.5 now . my plan is vmtools, hardware and vmfs . i have a question about migration . now first i must upgrade vmtools then hardware version or the exact opposite ( with snapshot or backup ). and my another question is about vmfs update. i have ms cluster in vcenter infrastructure how i can upgrade this datastore. so i dont know ms cluster virtual hard disk model ? I do not know how the MS cluster was made because I was not the one who built it. I don't know if this infrastructure supports vMotion. I could not understand if I could do without shutdown the ms cluster virtual servers.