Hello Gianluca,
You should also RTFM sooner or later.... ;-) http://www.ovirt.org/OVirt_Administration_Guide
In particular for this HA related concepts: http://www.ovirt.org/OVirt_Administration_Guide#Virtual_Machine_High_Availab... and http://www.ovirt.org/OVirt_Administration_Guide#Host_Resilience
Really, I don't think this documentation is good... I read this page many times and try to understand how the program works, but I have many doubt... In particular, the link you sent about HA: of course I read them and I configured the VMs with these settings, but really, I can't understand how can I set more host as a Cluster allowing automatically migration of the VMs when a host dies... Regards Mit freundlichen Grüßen Luca Bertoncello -- Besuchen Sie unsere Webauftritte: www.queo.biz Agentur für Markenführung und Kommunikation www.queoflow.com IT-Consulting und Individualsoftwareentwicklung Luca Bertoncello Administrator Telefon: +49 351 21 30 38 0 Fax: +49 351 21 30 38 99 E-Mail: l.bertoncello@queo-group.com queo GmbH Tharandter Str. 13 01159 Dresden Sitz der Gesellschaft: Dresden Handelsregistereintrag: Amtsgericht Dresden HRB 22352 Geschäftsführer: Rüdiger Henke, André Pinkert USt-IdNr.: DE234220077