LSF Version 7.3 - Administering Platform LSF

Administering Platform LSF 17
About Platform LSF
Commands:
◆ bjobs—View where a job runs
Server host Hosts that are capable of submitting and executing jobs. A server host runs sbatchd
to execute server requests and apply local policies.
An LSF cluster may consist of static and dynamic hosts. Dynamic host
configuration allows you to add and remove hosts without manual reconfiguration.
By default, all configuration changes made to LSF are static. To add or remove hosts
within the cluster, you must manually change the configuration and restart all
master candidates.
Commands:
◆ lshosts—View hosts that are servers (server=Yes)
Configuration:
◆ Server hosts are defined in the lsf.cluster.cluster_name file by setting the
value of
server to 1
Client host Hosts that are only capable of submitting jobs to the cluster. Client hosts run LSF
commands and act only as submission hosts. Client hosts do not execute jobs or run
LSF daemons.
Commands:
◆ lshosts—View hosts that are clients (server=No)
Configuration:
◆ Client hosts are defined in the lsf.cluster.cluster_name file by setting the
value of
server to 0
Floating client host In LSF, you can have both client hosts and floating client hosts. The difference is in
the type of license purchased.
If you purchased a regular (fixed) client license, LSF client hosts are static. The
client hosts must be listed in
lsf.cluster.cluster_name. The license is fixed to the
hosts specified in
lsf.cluster.cluster_name and whenever client hosts change,
you must update it with the new host list.
If you purchased a floating client license, LSF floating client hosts are dynamic.
They are not listed in
lsf.cluster.cluster_name. Since LSF does not take into
account the host name but the number of floating licenses, clients can change
dynamically and licenses will be distributed to clients that request to use LSF.
When you submit a job from any unlicensed host, and if there are any floating
licenses free, the host will check out a license and submit your job to LSF. However,
once a host checks out a floating client license, it keeps that license for the rest of
the day, until midnight. A host that becomes a floating client behaves like a fixed
client all day, then at 12 midnight it releases the license. At that time, the host turns
back into a normal, unlicensed host, and the floating client license becomes
available to any other host that needs it.