In the "Liferay Portal 6.0 - Administration Guide", there is a section on "Global Server Settings". Reading the content, some of these settings are just portal instance settings are not global throughout all the instances on a server.
http://www.liferay.com/documentation/liferay-portal/6.0/administration/-/ai/global-server-settings-2
Some content is also wrong.
Example: The statement below is wrong when using Database sharding. The statement should be "All portal data, however, by default is kept in the same database."
All portal data, however, is kept in the same database.
I think the Administrative Guide was written some times ago and does not reflect the functionalities available in the current version of Liferay. As the "Official" guide, it would be better to update it so users would not get misinformed.
Firmi prego dentro per inbandierare questo come inadeguato.