Hello Sujeeva, You did not provide full information about your OTRS environment such as modules you use (Tickets, CMDB, Changes...) and additional addons. You server sizing might be sufficient, it depends on number of tickets and concurrent user connections. I will give you some insight on our project, we implemented for our customer. It was OTRS-ITSM (latest version 4.x) with some addons with number of customer users/agents similar to yours (it was 2500/50). Default OTRS installation did not pass load test performed by customer (holding refresh button in web browser for some time ☺) . Test showed two issues: 1. User experience of other users was impacted and OTRS became unusable. 2. Eventually OTRS ended up in Internal Server error. We analyzed it and found out that: - first issue was caused by the fact that in default installation all HTTP requests (both dynamic and static content) are processed by single Apache server. Even after the first request for dynamic content (*.pl) was processed, being flooded by requests, it took long time to return all required static content. - second issue was more peculiar and it was caused by memory leak in mod_proxy, which caused that after every single request, apache process was using more memory. We solved it this way: 1. We added one extra apache server. It serves all OTRS static content (css, javascript, images). Other HTTP requests (*.pl) are forwarded to the original apache server. 2. We used mpm_prefork_module, which is configured to provide more apache worker processes and also restarts the worker processes after defined number of handled requests. I hope this will help you and maybe others when trying to squeeze more performance from the OTRS. Martin Jerga From: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] On Behalf Of Sujeeva Tissaarachchi Sent: Saturday, April 23, 2016 7:26 AM To: otrs@otrs.org Subject: [otrs] OTRS 5 for Production Dear Friends, I have just installed OTRS 5 (Free Version) and planning to use it for production of 1500 users (customers) and 35 agents. Configurations: Cent OS on VM RAM 6GB MySQL With your experience, how would you predict the performance in my production? Will it be practical for me to use it successfully in production? Thanks, Sujeeva