[Zope] Error packing database 2.1.7 -> 2.1.6

[Shaw, Mark]

I have a site that is currently running 2.1.7.  If I install a new instance
of 2.1.6, reload all the products, and copy all the Data* file from the
2.1.7 instance to the 2.1.6 instance, everything appears to work fine.

However, if I try to pack the database, the following error is generated.
The database packs without any problem when using the 2.1.7 instance.  This
copy of Zope is being run on RedHat Linux6.1. 

Thanks in advance for any help provided.


Traceback (innermost last):
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py,
line 214, in publish_module
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py,
line 179, in publish
  File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/Zope/__init__.py,
line 202, in zpublisher_exception_hook
    (Object: Fake)
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py,
line 165, in publish
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/mapply.py,
line 160, in mapply
    (Object: manage_pack)
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZPublisher/Publish.py,
line 102, in call_object
    (Object: manage_pack)
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/App/ApplicationManager.py
, line 338, in manage_pack
    (Object: ElementWithAttributes)
  File /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZODB/DB.py, line
522, in pack
  File
/disk_01/OPT/zope/Zope-2.1.6-linux2-x86/lib/python/ZODB/FileStorage.py, line
883, in pack
    (Object: /disk_01/OPT/zope/Zope-2.1.6-linux2-x86/var/Data.fs)
IOError: (see above)



-Mark