[Users] persistent modifications to /etc/hosts?

[Gianluca Cecchi]

Hello,
I would like to add an entry to /etc/hosts.
I modifiy it and then:

# persist /etc/hosts
File already persisted: /etc/hosts

But actually at reboot my modification is not there again....

This with ovirt-node-iso-2.5.5-0.1.fc17.iso

# cat /etc/redhat-release
oVirt Node Hypervisor release 2.5.5 (0.1.fc17)

What am I missing?
Thanks in advance,
Gianluca