Bad Guy wrote: > We have been setup a 4 ways multi-master replication openldap version > 2.4.11. > > It has been running for a year. > > However, recently, we find that one of the server has 100% high CPU and > all the replication can't be replicated to that server. There have been numerous fixes to OpenLDAP 2.4.x release series related to multi-master replication. You should seriously consider to upgrade. Ciao, Michael.