Separate Data.fs files for each Zope instance, cache size
Running one instance but using a separate db file for each instance. A single zope instance consums less memory. Add and mount a data.fs for every plone instance. It's very easy using zope 2.7:
<zodb_db plone1>
<filestorage>
path $INSTANCE/var/Data-plone1.fs
</filestorage>
mount-point /plone1
cache-size 5000
</zodb_db>
Restart zope and add a plone site with the id plone1. Note: You must create the folder after adding the moint point.
When using seperate dbs it's very easy to migrate some instances to a second server. You don't need to export a large site but simply copy the files and the sections in the zope.conf
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