Which CMS can handle serving pages from multiple hosting locations?
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Our company has been quite successful in managing its website including all of the business logic and stuff. However, there are also a lot of static content pages which today get served using a templating system which stores the content in serialized PHP objects on the file system.

We are now considering using a "real" CMS, however we have some requirements which sort out more or less all the usual suspects. The most important requirement is our hosting environment:

We have two completely separate hosting locations with a "share nothing" approach for failover. Both locations have separate MySQL instances which are slaves () of our master database which is located on-site at our HQ. Both locations have a certain number of web servers each storing the complete website (again, for failover).

From this architecture, two possible approaches come out naturally:
- A database-driven CMS which gets managed at our HQ and gets replicated over to our hosting locations (and images and stuff which gets replicated using our file sync process)
- A file driven CMS in which not only the attachments, but also the content files get synced using our file sync

The database driven approach seems more flexible to me, however we couldn't find a CMS which works in a "administer locally on a read/write database and serve content using only a read-only slave". The usual suspect for example (Typo3) needs a database to write to for its logging and session management, is therefore not an option. Other CMS seem to share this problem.  

So, long story short, is there a (PHP/MySQL-)CMS out there which can handle this? Any suggestions?

Extra points if the CMS can easily integrated with our Zend Framework applications (or vice versa).
