Nginx web server is installed and configured to provide a balance of flexibility, portability, and maximum performance. Testing Nginx on Magento many years, we have learned a lot.
Percona offers breakthrough performance, scalability, features, and instrumentation. Self-tuning algorithms and support for extremely high-performance hardware make it the clear choice for Magento.
Memcached is an in-memory key-value store for small chunks of arbitrary data from results of database calls. The Alternative PHP Cache (APC) is a free and open opcode cache. No disk cache configuration.
Cache servers are used to enhance performance by reducing the load on the database servers. Full Page Caching, with hole-punching via Varnish ESI, even for logged in visitors. SSL support through Nginx.
Redis is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
We are working with Magento since the very first version, in that time we have gained a lot of experience and knowledge in this area. Features tuning and optimization.