I am the server administrator and a website developer for GreenCupboards.com running on Magento Enterprise 1.9.1.1. I have over 15 years in software development and *NIX server administration. I have 5 years Magento experience with both Community and Enterprise Editions.

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Web Server: Ubuntu Server 12.04 LTS

Apache 2.2

Tomcat 6

PHP 5.3

Magento EE 1.9.1.1

Varnish full page cache

APC

SOLR --> both for search and category pages

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Data Server:

Ubuntu Server 12.04 LTS

MySQL 5