When we present Drupal as the platform that we recommend for the development of a Web project, it is inevitable that the client will be concerned about how stable it is and, above all, if it will be able to support the traffic projected for the project. Fortunately, Drupal is supported by a community. very solid where there are very experienced members in different areas who have contributed their knowledge to make Drupal one of the most solid and preferred platforms for high traffic sites, that is why I want to share this case that will reassure many about how much Traffic is capable of supporting a Drupal installation when a good job of configuring both Hardware and Software infrastructure has been done.
Let's look at the case of gazzetta.gr since it is the most recent that I have seen, with an average of 200,000 unique users and 1,600,000 page views per day, it is in the top 3 of sports news portals in Greece, the diagram Infrastructure configuration they implemented is as follows:
More information: http://www.wedia.gr/blog/66/gazzettagr-joomla-drupal-migration
If you want to see other cases of sites created with Drupal (in general) I recommend visiting http://www.drupalsites.net/ and http://drupal.org/cases