In order to support migration from ds 7.1 and 1.0.x to 1.1 (and 7.2), we need to be able to support upgrading the bdb files created with 4.2 to 4.3 and later. Fedora only supports bdb 4.3 now, and will support 4.5 and 4.6 in the near future. During migration, we should be able to copy the database files/directories to their new location (e.g. from /opt/fedora-ds/slapd-instance/db to /var/lib/fedora-ds/slapd-instance/db) and when the new server instance starts up, it should upgrade the new db files.
I used the original bug 232050 "Change format of DBVERSION and guardian files" for this issue. (See the Comment #4 and #6) *** This bug has been marked as a duplicate of 232050 ***