Everyone with an active HPC account is automatically included on the hpc-announce mailing list. This one-way list is used by system managers for announcements regarding the HPC systems. An archive of this mailing list can be accessed by list members here. An archive (minus some of the less substantive entries) of its predecessor, sciclone-users, can be found here. General information about the status of the clusters may also be found on IT's homepage, through the System Status feature.
For specific node availability information, use the commands
pbsnodes -l all
while logged in to any of the login servers for the cluster you're interested in. Note that TORQUE considers a node "free" (e.g. for
pbsnodes -l free) when there is at least one available core. Since users would often rather know how many nodes are completely idle, we provide a wrapper around
freenodes, which reports counts of nodes that are not running any job whatsoever.