User guide

Chapter 4 - Selecting Server Machines

Redundant License Servers

FLEXnet Licensing End User Guide 41

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 Servers

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

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

Redundant license server machines are any supported server machines.

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 servers

With

LM_LICENSE_FILE list redundancy, each one of a group of license servers 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 servers. 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 servers are up and running (two

out of three license servers is referred to as a quorum), the system is functional and serves its

total complement of licenses.