I have a virtualization moodle site that has the following configuration:
_Web: Ram 24GB, 10 core vCPU, Disk 10k SAS, CentOS 7, Apache 2.4.6, PHP 7.4
_DB: 20GB RAM, 10 core vCPU, Disk 10k SAS, CentOS 7, 10.5.4-MariaDB
Currently, every month, the sales staff will do the test once on moodle app on tablet / mobile, the number of about 800 users. At that time, the server is slow to access, and there is a "server connection error" when you next click through a new question.
I have installed & tunning cache store (memcached, redis ....) but still access slowly. So with such traffic, what should I do next to respond.
Thank you for reading
P/S: The picture below means "server connection error"