We are in the phase of implementing Moodle 3.2 and doing Load runner test for 500 users but we are getting 500 internal server error and 503 service unavailable for scorm and video (6 minutes) based courses.
Below is the our server resources details.
1) . 3 web front ends/applications server - Windows Server 2012 R2, IIS 8.5, RAM-128GB, CPU Intel Xeon E5 2660 v3 @2.60GHz
2). PHP 5.6.7
3). Dedicated MSSQL 2016 Server.
5) Load balancing is happening through F5 (round robin)
6) Implemented memcache.
7). IIS application pool recycling happens at 2.8GB private and virtual memory utilization.
Enabled the FailedRequestLogs and below is the response for 500.
https://localhostXXXXXX:443/pluginfile.php/2798/mod_video/content/1/Who..mp4, STATUS_CODE 500, 90172 ms, GET
https://localhostXXXXXXX:443/course/?mycourses=1, STATUS_CODE 200, 1031 ms, GET
Please help us to tune the system.