[ZODB-Dev] Blobstorage shrinks only after the second pack operation - bug or feature?

[Andreas Jung]

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I noticed a strange behavior with packing a storage having lots of data
in a blob storage (Plone 4.2, Zope 2.13).

I had a large Plone site (5 GB of data in blobstorage) in a dedicated
storage. I removed the Plone Site object and packed the storage through
the Zope 2 database management screen. The size of the Data.fs went down
however the blobstorage size remained the same. Packing a second removed
the obsolete data from the blob storage.

So why do I have to pack two times in order to get a minimized blob
storage? Bug or feature?

Andreas
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