User guide

Chapter 4 - Selecting License Server Machines

Redundant License Server Systems

FLEXnet Licensing End User Guide 41

on a remote mounted disk, you double the points of failure which could lead to a temporary loss

of all of your licenses. When all files are mounted locally, the licenses are available as long as

the server machine is up; but when the files are on a different machine, then the loss of either

the license server machine or the file server machine causes the licenses to be unavailable.

Redundant License Server Systems

If you wish to use redundant license server systems, select stable machines; in other words, do

not pick machines that are frequently rebooted or shut down for one reason or another.

Redundant license server machines are any that support a license server system.

FLEXnet Licensing supports two methods of redundancy:

• via a license-file list in the

LM_LICENSE_FILE environment variable

• via a set of three redundant license server systems

With

LM_LICENSE_FILE list redundancy, each one of a group of license server systems serves

a subset of the total licenses. The end user sets

LM_LICENSE_FILE to a list of license files,

where each license file refers to one of the license server systems. The application then tries

each server in the list, in order, until it succeeds or gets to the end of the list.

With three-server redundancy, if any two of the three license server systems are up and running

(two out of three license server systems is referred to as a quorum), the system is functional and

serves its total complement of licenses.