NX How to minimize flexlm search list network latency

NX allows clients be configured to search 2 or more (multiple) license servers.


What are the caveats with respect to minimizing network latency?

Solution

A license server search list is a mechanism that allows an NX client to search 
two or more license servers for requested license feature(s).


Typical uses are to allow multiple physical sites to share each others license 
servers but still allow independent local control.


REVIEW:


How is a license server search list defined?




FOR NX/1847 or higher


Linux


If using csh (C-shell), add to /etc/csh.login: 
setenv SPLM_LICENSE_SERVER "28000@serverA:28000@serverB"


If using sh (Bourne shell or Korn shell), add to /etc/profile: 
export SPLM_LICENSE_SERVER=28000@serverA:28000@serverB


Windows


Start -> 
 Control Panel -> 
 System -> 
 Advanced -> 
 Environment Variables-> 
 System Variables 
(create)


Variable Name: SPLM_LICENSE_SERVER 
Variable Value: 28000@serverA;28000@serverB


License server search list caveats.


TO MINIMIZE Network Latency


The order in which the servers are listed in the UGS_LICENSE_SERVER or 
SPLM_LICENSE_SERVER is the order in which they are searched.


The first server listed should be your primary server.


Usually (but not always) the primary server is a server that is physically 
closest to the client. Thus network latency delays are minimized.


Example:


SPLM_LICENSE_SERVER = 28000@serverA;28000@serverB


In this example the client would normally get all of their licenses from 
ServerA. In the event that ServerA did not offer the license or was 
unavailable, the license search would move to ServerB.


"License not available" message would be raised only if the license was not 
available on any of the two license server configurations.


Caution:


Search lists cross search back and forth between serverA and serverB. 
Average checkout latency times are on the average, significantly slower.


Checkout latency times also increase if the license file itself contains many 
features.


Thus, license server search lists should only be used after careful 
consideration.


GTAC suggests that a test client be setup and NX used under production 
conditions to determine if overall license feature checkout times 
are acceptable.

Notes and References

Hardware/Software Configuration

Platform: INTEL
OS: window
OS Version: 2012_R2
Product: NX
Application: SYSENG
Version: P1859
Function: INSTALL_ISSUES

Ref: 002-7006690