Checking your ZODB storages for PosKey errors

• create a virtualenv environment for Python 2.6
• install zc.zodbdgc:

bin/easy_install zc.zodbdgc

• create a copy of the storage file (your Data.fs)
• create a configuration file in.cfg for this storage:

<zodb 1>
  <filestorage main>
      path /path/to/Data_copied.fs
  </filestorage>
</zodb> 

• run the check (the script will give you some reasonable output possible Poskey error if there are any. For a consistent storage there won't be any output):

bin/multi-zodb-check-refs in.cfg