[Zope] Importing -> Disk full

Hi, I'm trying to import a *.zexp File into Zope 2.6 which lies in /opt on a RedHat 7.2. During the import process the filesystem mounted on / gets full !!! Why that? What does Zope do on /, when it's supposed to hold it's data in /opt ? How can I change this? I cannot change the capacity for / !!! Any Ideas? regards Lars