Run as root on the EMS.

This test uses xdsh and uses "lpar" for the node group. Use a different node group if desired.

Note xdsh can leave behind processes if you do a <CNTRL-C> in the middle of a command.  
To gaurd against results which are messed up by old copies of the ping test, kill
any leftover ping processes.


1)  Create the ping_address_file. This is only required if changes have been made since the last
    run; e.g., octants deconfigured, ARP entries changed, etc.

    "./create_ping_address_file [interface]"    

    If the "interface" argument is not provided, it defaults to "ml0" as the interface to test.

    Remove any nodes you don't want to run the ping test.

2)  Copy "ping_address_file" to /tmp on each node:

    xdcp lpar -v ping_address_file /tmp

3)  Copy "ping_all" to /tmp on each node:

    xdcp lpar -v ping_all /tmp
     
4)  Remove any output files from previous runs:

    xdsh lpar -v "rm /tmp/ping.all.out 2>/dev/null"

5)  Run the ping test:

    "./start_ping_all"

    Each node in the test will write any ping failures to "/tmp/ping.all.out" (local /tmp on each node).
    (No "ping.all.out" file indicates no ping failures.)

6)  To determine if we have ping failures:

    xdsh lpar -v "ls -l /tmp/ping.all.out 2>/dev/null" | sort -n +5

    If a given set of "ping.all.out" files are the same length, it's likely they will have 
    duplicate ping failures.