The ZODB blobstorage directory contains a .layout file with the string 'lawn', 'bushy'.
What is the difference between the various blob storage directory formats?
It is explained here: https://github.com/zopefoundation/ZODB/blob/master/src/ZODB/tests/blob_layout.txt
FTA:
====================== Blob directory layouts
The internal structure of the blob directories is governed by so called
layouts
. The current default layout is calledbushy
.The original blob implementation used a layout that we now call
lawn
and which is still available for backwards compatibility.Layouts implement two methods: one for computing a relative path for an OID and one for turning a relative path back into an OID.
Our terminology is roughly the same as used in
DirectoryStorage
.
It also explains the formats in detail.