> Perhaps a failure if someone tries to set olcMirrorMode to TRUE when > serverID is 0. > > That covers the MMR case, but it doesn't cover the non-MMR case where > unique serverIDs are required with separate masters and glued databases. Catching the MMR case would already be a real improvement. The latter case is far less common and people glueing DBs are likely more familiar with OpenLDAP setups.