CUPS & HEARTBEAT

[HAY]

HI !

I am building a redundancy cluster with heartbeat and cups
My first server is running cups and my printers, all is fine.
My second server doesn't run cups as long as the first server failed
When my first server is off, the second is not available for printing in spite of cups is running ?? (connecting impossible)
I have read something about 'classes' of printer, for this sort of problem, but it doesn't work ?
Could you help me ?
thanks