Sometimes when you try to DLPAR something from the HMC, it fails to communicate, it is because some daemons aren’t running on the client.

I have run this on a vio server. I don’t know if it will affect a client that is already using rsct for something else (HACMP):

to reset the deamons
usr/sbin/rsct/install/bin/recfgct
/usr/sbin/rsct/bin/rmcctrl -p
/usr/sbin/rsct/bin/rmcctrl -z
/usr/sbin/rsct/bin/rmcctrl -A