Load balancing using SDM Web Engines and Web Directors.

Products

• CA Service Desk Manager
• CA Service Management - Service Desk Manager
• ServiceDesk

Issue/Introduction

How does SDM Load balancing work between multiple web-engines.

Environment

Service Desk Manager v14.x and higher

Resolution

1. This article explains how to configure multiple web-engines (ex: pdmweb.exe ,pdmweb1.exe and pdmweb2.exe) on a single application server successfully: How to Configure Multiple CA SDM Web Engines on Application Servers?
   
   
2. When You launch the SDM URL "http://server:8080/CAisd/pdmweb.exe"-> it will direct you to either
   "http://<server>:8080/CAisd/pdmweb1.exe"
   OR
   "http://<server>:8080/CAisd/pdmweb2.exe"
   Based on the Load on each web-engine.
   
   
3. To check the load, run the "pdm_webstat" command. It will show cumulative sessions, most sessions at a time and current active sessions on each web-engine.
   Below is an image that shows an example with single Login on each web-engine.
   
   
   
4. If "cummulative Sessions so far" from the above command output is equal on all web-engines then
   1st Login  will direct to: pdmweb.exe
   2nd Login  will direct to: pdmweb1.exe
   3rd Login  will direct to: pdmweb2.exe
   
   If "cummulative Sessions so far" -> Is not equal on each web-engine -> then all the login request will be directed to the web-engine which has the fewest logins until the sessions are equal on each web-engine.

 

Additional Information

These articles can provide more information:

How to Configure Multiple CA SDM Web Engines on Application Servers?

Set up a Service Desk Manager secondary server using the Administrator Web Interface

Finding which machines currently have active sessions in CA Service Desk Manager (CA SDM)