Собственно, сабж.
Условия такие:
* Web Server - Apache 1.3 or Apache 2.x. We have reports of successful run on the latest version of Nginx. Drupal can also run on Microsoft IIS. Apache is still the most tested platform and strongly recommended.
* PHP – Version 5.2.x
* Database – MySQL 4.1 or 5.0, though MySQL 5.0 is strongly recommended.
* Installing a PHP code optimizer like APC is highly recommended, especially for production use.
* Your memory_limit variable, in php.ini needs to be at least 128M, but 220M is recommended.
* If you are still having problems (seeing "white screens of death" or errors during installation) try setting:
o max_execution_time to around 120 and
o realpath_cache_size to 512K, 1M or even 2M.
o max_input_time to around 120.