I am just trying to further optimize our servers. MySQL is already fully tuned and working well on an SSD drive. On our ESXi host it shows that our cPanel/Cloudlinux server is only using about 4GB of memory, but it has 42GB allocated so quite a bit is not being utilized.
Does anyone have any recommendations on where this memory could be increased in Apache, or PHP configuration to further improve performance? PHP memory limit is already increased to 512mb, but maybe we should look at increasing it more, or would that not improve performance and maybe decrease security since it is just a limit.
Also, regarding disk performance with cPanel. What directories would be best to move over to a PCIe SSD card? Would /home, and /var/lib/mysql be the two main ones that are most accessed and need faster read/write speeds? Or are there other directories within the OS that should also be moved over to SSD.