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Load balancing using SDM Web Engines and Web Directors.

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Article ID: 199780

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Updated On:

Products

CA Service Desk Manager CA Service Management - Service Desk Manager

Issue/Introduction

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

Environment

Release :14.x and Higher
Component: Service Desk Manager

Resolution

1. Configure multiple web-engines(ex: pdmweb.exe ,pdmweb1.exe and pdmweb2.exe) successfully.


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 "pdm_webstat" command, It will show cumulative sessions, most sessions at a time and current active sessions on each web-engine.
Below image will show you an example with single Login on each web-engine.


4. If "cummulative Sessions so far" from 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 that web-engine which has less count. Until the sessions are equal on each web-engine.
That is How load balancing is achieved

Additional Information

Multiple web-engines on SDM :
https://techdocs.broadcom.com/us/en/ca-enterprise-software/business-management/ca-service-management/17-1/administering/configure-ca-service-desk-manager/how-to-configure-multiple-ca-sdm-web-engines-on-application-servers.html

How to setup secondary server web-engine:
https://knowledge.broadcom.com/external/article/32147/how-to-set-up-a-service-desk-manager-sec.html

Reference documents on pdm_webstat:
https://knowledge.broadcom.com/external/article?articleId=26251

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