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Question About Ubuntu 20 Plesk Poor Performance

Ahmet CAVUSOGLU

New Pleskian
Server operating system version
Ubuntu 20.04.01 LTS
Plesk version and microupdate number
18.0.48
Hello

A server that I serve to my customers is running with 8 Core 16GB Ram 150 GB SSD + Ubuntu 20 LTS + Plesk 18.0.48 versions. It contains 20 domains. (The system memory does not exceed 6GB.) There are also security add-ons such as Email Security Antivirus, which is one of the Plesk add-ons.

My problem is actually as follows, although I have given 1GB of php memory to the domains, I get an "Error 500" error when one or more domains are in high demand. Although my other server, Centos 7, has lower system hardware (6 Cores 6 GB Ram), similar situations do not occur.

My guess is that Email Security is tiring the system, but I would like to hear your thoughts from our fellow users.

Thanks
 
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