Best server configuration to run an high traffic WordPress website
I'm trying to configure an optimized server to run an high traffic WordPress website. So I installed nginx + php7 fpm and fastcgi cache + MariaDB. Now I would ask if make it sense to install redis to speed it up, and if install W3TC is the right choice (does W3TC works in place of fastcgi cache?). Does this configuration have a faster alternative? Then If I will split Nginx and MySQL in two servers, which in your opinion needs the more RAM? At last, is it better to run redis on a standalone server?
Thanks a lot :)