[collectd] Libvirt doesn't fill rrd databases

[Eduardo Minguez]

Hi folks! :)
I'm installing collectd, and wants to collect statistics from domUs in a 
xen cluster.
I've created some rpms (we use centos 5.1), to get a collectd + libvirt 
package. Everything works fine, except no data is in rrd databases, and 
there is no output about that in logs.
The rrd databases are created fine, except cpu rrd database, which isn't 
created (no log about that).
I know isn't enough information, but logs doesn't say anything (in the 
server, collectd has been compilated "by hand" with debug support, and 
the log plugin is in "debug" mode).
Any clue?!
Thanks a lot :)