Platform LSF Administration Guide Version 6.2

How LSF Permanent Licensing Works
Administering Platform LSF
172
When the slave LIMs start, they contact the master host to get the licenses they
need.
3 Check out licenses needed for client hosts listed in
LSF_CONFDIR/lsf.cluster.cluster_name.
If the license checkout fails for any host, that host is unlicensed. The master LIM tries
to check out the license later.
LSF license grace period
If the master LIM finds the license server daemon has gone down or is unreachable, LSF
has a grace period before the whole cluster is unlicensed. As long as the master LIM that
originally received the licenses is not restarted or shut down, the LSF cluster can run up
to 60 hours without licenses. If you reconfigure LSF after the license server daemon
becomes unavailable, you lose the grace period and the cluster is unlicensed because the
original LIM that carries the correct license information is killed and restarted during
reconfiguration. This prevents LSF from becoming a single point of failure and enables
LSF to function reliably over an extended period of time (for example, over a long
weekend) should the license server daemon fail.
Unlicensed cluster
While LSF cannot contact a license server daemon, LSF commands are automatically
resubmitted, not aborted.