Sorry look like the lab-lightning is a bad sample case. The reason I've pick a random host is because when running poller with "-h all" I get these "Unpingable" message on all the hosts and I've checked that they are not disabled.
But pinging a single host is okay.
^C
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.378/0.406/0.434/0.028 ms
Running it on the individual host appeared to work but still getting the "Unpingable" message...
Observium Poller v0.13.1.3507
DEBUG!
Starting polling run:
SQL[SELECT `device_id` FROM `devices` WHERE `disabled` = 0 AND `hostname` LIKE '
vg-dd60-sw.sdsc.edu' ORDER BY `device_id` ASC]
SQL[SELECT * FROM `devices` WHERE `device_id` = '2']
SQL[INSERT INTO `perf_times` (`type`,`doing`,`start`,`duration`,`devices`) VALUES ('poll','
vg-dd60-sw.sdsc.edu','1357325696.7643','0.012','1')] ./poller.php
vg-dd60-sw.sdsc.edu January 4, 2013, 10:54 - 1 devices polled in 0.012 secs
MySQL: Cell[0/0s] Row[1/0s] Rows[1/0s] Column[0/0s] Update[0/0s] Insert[1/0.07s] Delete[0/0s]
OK u:0.00 s:0.00 r:0.01