What is the maximum number of sites in Plone 4.1

I would like to know how many sites / virtual hosts are allowed in a single installation of Plone. I am currently using a zeocluster installation. I am inte开发者_运维技巧rested in the theoretical maximum i.e. infinite hardware, bandwidth etc.

If none are accessed then I'm guessing you can as many as you want. If they are accessed then your constraints are memory and cpu. We generally deploy our multisite deployments with separate mounts for every site which means there is a separate zodb cache for each site. This means that each site uses more RAM on each zope instance, but since this is infinite that isn't a problem for you :) CPU comes into play if all sites are accessed often. More requests, more cores are needed to avoid lagging requests. The third aspect is the database. Eventually if you're doing writes on those sites often enough, you'll max out your zodb connection. This is not easy to do since zodb requests are light. However if you did, then you could potentially get around this by using relstorage and having replication.

There's no theorical limit of Plone instances inside a single Zope instance. As its name says, Zope is an Object Publishing Environment and from Zope's point of view a Plone site is nothing more than an object like any other.