Platform LSF Reference Version 6.2

lsf.cluster
Platform LSF Reference
491
Host Section
The Host section is the last section in lsf.cluster.cluster_name and is the
only required section. It lists all the hosts in the cluster and gives configuration
information for each host.
The order in which the hosts are listed in this section is important, because the first host
listed becomes the LSF master host. Since the master LIM makes all placement
decisions for the cluster, it should be on a fast machine.
The LIM on the first host listed becomes the master LIM if this host is up; otherwise,
that on the second becomes the master if its host is up, and so on. Also, to avoid the
delays involved in switching masters if the first machine goes down, the master should
be on a reliable machine. It is desirable to arrange the list such that the first few hosts in
the list are always in the same subnet. This avoids a situation where the second host takes
over as master when there are communication problems between subnets.
Configuration information is of two types:
◆ Some fields in a host entry simply describe the machine and its configuration.
◆ Other fields set thresholds for various resources.
Example Host section
This example Host section contains descriptive and threshold information for three
hosts:
Begin Host
HOSTNAME model type server r1m pg tmp RESOURCES RUNWINDOW
hostA SparcIPC Sparc 1 3.5 15 0 (sunos frame) ()
hostD Sparc10 Sparc 1 3.5 15 0 (sunos) (5:18:30-1:8:30)
hostD ! ! 1 2.0 10 0 () ()
hostE ! ! 1 2.0 10 0 (linux !bigmem) ()
End Host
Descriptive fields
The following fields are required in the Host section:
◆ HOSTNAME
◆ RESOURCES
◆ type
◆ model
The following fields are optional:
◆ server
◆ nd
◆ RUNWINDOW
◆ REXPRI
HOSTNAME
Description
Official name of the host as returned by hostname(1)
The name must be listed in
lsf.shared as belonging to this cluster.