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_Availability_Settings_Explained
> 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

High Availability Considerations

A highly available host requires a power management device and its fencing parameters configured. In addition, for a virtual machine to be highly available when its host becomes non-operational, it needs to be started on another available host in the cluster. To enable the migration of highly available virtual machines:

• Power management must be configured for the hosts running the highly available virtual machines.
• The host running the highly available virtual machine must be part of a cluster which has other available hosts.
• The destination host must be running.
• The source and destination host must have access to the data domain on which the virtual machine resides.
• The source and destination host must have access to the same virtual networks and VLANs.
• There must be enough CPUs on the destination host that are not in use to support the virtual machine's requirements.
• There must be enough RAM on the destination host that is not in use to support the virtual machine's requirements.