[virt-tools-list] virt-manager: disk+network i/o disabled

[James Brackinshaw]

Hello,

I have a RHEL5.4 box running two RHEL5.4 guests and a Fedora guest.

All using virtio26.

In virt-manager the overview tab for a guest shows that network and
disk i/o is "disabled" for the graphs. I need to be able to view disk
and network i/o to diagnose performance problems.

How can I enable it?

Thanks

JB