Most of them are outdated, but provide historical design context.
They are not user documentation and should not be treated as such.
Documentation is available here.
While every oVirt version delivers new features based on new VDSM APIs (i.e., a new cluster level) or even new SPM APIs (i.e., a new DC level), these features usually do not require any upgrade to the underlying storage domain format. The new 4.1 DC level delivers several features that do, in fact, require such an upgrade, which inspired the introduction of a new storage domain format, V4. This new format includes:
- Released in oVirt 4.1
The upgrade will be handled as a storage domain live upgrade, just like previous domain upgrades were handled.