bpcp is the best utility for copying files effeciently across the cluster. It is the bproc replacement for rcp and scp. It's syntax is compatable with rcp.
bpcp <source> <destination>
Both source and destination are specified in the form [<node>:][<path>/]<filename>
Any optional portion that is not specified will take on a reasonable default value as follows:
As might be expected, '.' specifies the CWD.
For compatability with older cluster software, bpcp is syntax compatable with rcp. Thus, in source code, one may safely s/rcp/bpcp/g and re-compile.
bpcp /etc/sensors 1:/etc cd /etc ; bpcp sensors 1: bpcp 2:/etc/sensors 1:/etc