I use accesslog too, try with it in both masters, I'm now using bdb, change it to your backend definition
Migue
allow bind_v2 include /usr/local/openldap/etc/openldap/schema/core.schema include /usr/local/openldap/etc/openldap/schema/corba.schema include /usr/local/openldap/etc/openldap/schema/cosine.schema include /usr/local/openldap/etc/openldap/schema/nis.schema include /usr/local/openldap/etc/openldap/schema/inetorgperson.schema pidfile /usr/local/openldap/var/run/slapd.pid argsfile /usr/local/openldap/var/run/slapd.args modulepath /usr/local/openldap/libexec/openldap moduleload syncprov password-hash {SSHA}
database bdb
suffix cn=accesslog rootdn "cn=accesslog" directory "/usr/local/var/access"
index default eq index entryCSN eq index entryUUID eq index objectClass,reqEnd,reqResult,reqStart,reqDN,contextCSN
access to * by dn="cn=admin,dc=ar" read by * read
database hdb
suffix "dc=***,dc=com" rootdn "cn=root,dc=***,dc=com" rootpw {SSHA}yZkqhHmELfmUTsaQyfxgXBqq95gugTA4 directory /usr/local/openldap/var/openldap-data index uid pres,eq index cn,sn pres,eq,approx,sub index objectClass eq index entryCSN,entryUUID eq syncrepl rid=001 provider=ldap://192.168.1.12 type=refreshAndPersist retry="5 5 300 +" searchbase="dc=***,dc=com" attrs=* binddn="cn=root,dc=***,dc=com" credentials=secret
overlay syncprov syncprov-checkpoint 50 10
overlay accesslog logdb cn=accesslog logops writes logsuccess TRUE logpurge 2+00:00 1+00:00 logold (objectclass=auditDelete) logoldattr reqDeleteOldRDN
database monitor
loglevel 256
mirrormode true