Sybase 15 manual Using multiple network license servers, Setting up multiple network servers

Sybase Software Asset Management

2Replication Server version 15.0 uses a newer version of the SySAM licensing technology and an updated license format. On any one machine, you can have only one instance of a license server running. You must make some adjustments to use earlier versions with Replication Server 15.0. See “Co-existing with earlier versions of SySAM” on page 8.

Using multiple network license servers

As part of a failover plan or a load-balancing system, you can have multiple SySAM network license servers running a subset of the total licenses. The SySAM network license servers can be connected by a local area network (LAN) or by a wide area network (WAN).

This configuration is an excellent load-balancing mechanism for physically distant locations. You can specify the local servers ahead of the remote servers in the license location list.

To specify multiple license servers, set up the SYBASE_LICENSE_FILE or LM_LICENSE_FILE environment variable to contain a list of license files, where each license file refers to one of the network license servers. Replication Server uses this list to checkout licenses, starting with the first server on the list. If check-out fails for any reason, Replication Server attempts to check out licenses using the second server in the list, and so on.

Although this configuration provides a basic level of failover protection, if one or more license servers in the list are down, the licenses served by these servers are no longer available, so the total number of available licenses is reduced until the servers restart.

Note See “Redundant License Server Systems” in Chapter 4, “Selecting

License Server Machines,” of the FLEXnet Licensing End User Guide.

Setting up multiple network servers

To use multiple network license servers, install a network license server on two or more servers using the instructions in “Installing a new license server” on page 22.

To configure Replication Server to use multiple network servers, specify the network server addresses in the SYBASE_LICENSE_FILE environment variable as port@host separated by a semicolon. For example:

6 Replication Server