[Zope] Re: Trouble migrating from Zope 2.5.x to Zope 2.9.x

[Maurits van Rees]

Doug Morse, on 2007-08-09:
> Hello Fellow Zopers,
>
> I'm trying to migrate an older Zope installation (2.5.x) to Zope 2.9 and I'm
> having some trouble.  I can mount the old ZODB in the new installation -- it
> shows up under the database control panel with the correct size (4.4M) --
> but it appears to be empty.  By "empty", I mean there are no folders or
> objects present when I view the mount point using the ZMI, and I get
> "Resource Not Found" errors when trying to view object I know to be there.
> I'm not getting any error messages within the ZMI or in the events.log file
> regarding problems with the older Data.fs file or mounting it.

A 4.4 MB Data.fs *is* rather empty.  That is only marginally bigger
than the size you get when you start with a fresh zope instance.  Are
you sure the objects you expect are actually there when you start a
2.5 Zope with this database?

> I'm wondering if there's some sort of "upgrading" of the ZODB file I need to
> perform?  Any help with this would be MOST appreciated, as I'm not turning
> up anything in the docs, with google, or any other means I can think of, and
> I need to get this site migrated.

Not sure, but you might need to first upgrade to 2.6, then 2.7, then
2.8, then 2.9.  At least I would not be surprised if that is the case.

> Just for completeness: The only thing different about the new Zope
> installation is that the old Data.fs file is being mounted within Zope under
> a subdirectory (e.g., "/sitename") instead of the root directory (i.e.,
> "/"). There's a new ZODB mounted at the root directory, and several other
> new ZODBs mounted in other subdirectories for new sites -- they all
> work fine but also were created using Zope 2.9, not Zope 2.5.

I would first migrate the 2.5 database to 2.9 in a separate zope
instance with only this database, not any others.  After that you can
try mounting that migrated database together with the others.  This is
just a guess though: I have never tried anything like this.

-- 
Maurits van Rees | http://maurits.vanrees.org/ [NL]
            Work | http://zestsoftware.nl/
"Do not worry about your difficulties in computers,
 I can assure you mine are still greater."