[ovirt-users] Storage domain format version info

Hello, part of updating a DC from 4.2 to 4.3 consists in updating format of data storage domains from V4 to V5. Questions: - where can I find list of differences between V4 and V5? And in general between previous ones? - can I force only a particular storage domain to remain in V4 while having the other ones upgraded to V5, for any reason? Or the reverse: update only one of the defined domains? Eg on oVirt web site I only found this for V4 https://www.ovirt.org/develop/release-management/features/storage/storage... with mention about Qcow2 v3 (link broken.. one ot the upstream pages for it here: https://wiki.qemu.org/Features/Qcow3 ) that should give near raw performance with advantages of qcow2 format... Thanks, Gianluca