Ping $nodesStr from the management server. Different adapters on the $nodesStr can be pinged by filling in the options below.  The dping command will use fping if it is installed on the management server.  Otherwise, it implements its own parallel ping.

Options:
Interfaces: The list of network interface names to ping on each $nodeStr.  For example, if you specify eth1, then the hostname <${nodeStr}name>-eth1.<domain> will be pinged for each $nodeStr.
Summary Only display a summary of the ping results, instead of displaying the result for each $nodeStr.
Recursively ping After pinging each $nodeStr, the $nodeStr will try to ping the other $nodesStr.
Serially ping Instead of forking processes to ping the $nodesStr in parallel, ping each $nodeStr in sequence.  Not sure why you would want to do this, but here you go.
Verbose Run dping in verbose mode.