[root@ipa15 slapd-CXN]# tail /var/log/dirsrv/slapd-CXN/errors
[12/Apr/2018:13:26:05.231364497 +0200] NSMMReplicationPlugin - agmt="cn=ipa15.bpo.cxn-to-ipa35.bph.cxn" (ipa35:389): Data required to update replica has been purged from the changelog. The replica must be reinitialized.
[12/Apr/2018:13:26:05.232377892 +0200] agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389) - Can't locate CSN 5a0a27d9000000060000 in the changelog (DB rc=-30988). If replication stops, the consumer may need to be reinitialized.
[12/Apr/2018:13:26:05.233482709 +0200] NSMMReplicationPlugin - changelog program - agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389): CSN 5a0a27d9000000060000 not found, we aren't as up to date, or we purged
[12/Apr/2018:13:26:05.234574121 +0200] NSMMReplicationPlugin - agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389): Data required to update replica has been purged from the changelog. The replica must be reinitialized.
[12/Apr/2018:13:26:09.365978165 +0200] agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389) - Can't locate CSN 5a0a27d9000000060000 in the changelog (DB rc=-30988). If replication stops, the consumer may need to be reinitialized.
[12/Apr/2018:13:26:09.367651068 +0200] NSMMReplicationPlugin - changelog program - agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389): CSN 5a0a27d9000000060000 not found, we aren't as up to date, or we purged
[12/Apr/2018:13:26:09.368795838 +0200] NSMMReplicationPlugin - agmt="cn=ipa15.bpo.cxn-to-ipa34.bph.cxn" (ipa34:389): Data required to update replica has been purged from the changelog. The replica must be reinitialized.
[12/Apr/2018:13:26:09.370046314 +0200] agmt="cn=ipa15.bpo.cxn-to-ipa35.bph.cxn" (ipa35:389) - Can't locate CSN 5a0a27d9000000060000 in the changelog (DB rc=-30988). If replication stops, the consumer may need to be reinitialized.
[12/Apr/2018:13:26:09.371076721 +0200] NSMMReplicationPlugin - changelog program - agmt="cn=ipa15.bpo.cxn-to-ipa35.bph.cxn" (ipa35:389): CSN 5a0a27d9000000060000 not found, we aren't as up to date, or we purged
[12/Apr/2018:13:26:09.372024624 +0200] NSMMReplicationPlugin - agmt="cn=ipa15.bpo.cxn-to-ipa35.bph.cxn" (ipa35:389): Data required to update replica has been purged from the changelog. The replica must be reinitialized.
[root@ipa15 slapd-CXN]# ls -la /var/lib/dirsrv/slapd-CXN/cldb/
total 560
drwxr-xr-x 2 dirsrv dirsrv       7 Apr 12 10:59 .
drwxrwx--- 6 dirsrv dirsrv       6 Nov 15 15:27 ..
-rw------- 1 dirsrv dirsrv  188416 Apr 12 13:24 1265b714-ca1111e7-8b4be16c-d336c0e2_58987d9e000000040000.db
-rw-r--r-- 1 dirsrv dirsrv       0 Apr 12 10:59 1265b714-ca1111e7-8b4be16c-d336c0e2.sema
-rw------- 1 dirsrv dirsrv 3923968 Apr 12 13:13 5b1d7070-ca1111e7-8b4be16c-d336c0e2_58987e19000000060000.db
-rw-r--r-- 1 dirsrv dirsrv       0 Feb 23 08:01 5b1d7070-ca1111e7-8b4be16c-d336c0e2.sema
-rw------- 1 dirsrv dirsrv      30 Nov 15 15:27 DBVERSION
[root@ipa15 slapd-CXN]# dbscan -f /var/lib/dirsrv/slapd-CXN/cldb/5b1d7070-ca1111e7-8b4be16c-d336c0e2_58987e19000000060000.db | grep 5a0a27d9000000060000
[root@ipa15 slapd-CXN]# dbscan -f /var/lib/dirsrv/slapd-CXN/cldb/1265b714-ca1111e7-8b4be16c-d336c0e2_58987d9e000000040000.db | grep 5a0a27d9000000060000
[root@ipa15 slapd-CXN]# 


[root@ipa35 cldb]# tail /var/log/dirsrv/slapd-CXN/errors

[10/Apr/2018:10:04:32.885553831 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa34.bph.cxn" (ipa34:389): Warning: Unable to parse the response  to the endReplication extended operation.
[10/Apr/2018:10:39:59.910735350 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa34.bph.cxn" (ipa34:389): Warning: Unable to parse the response  to the endReplication extended operation.
[11/Apr/2018:13:43:48.793517144 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa34.bph.cxn" (ipa34:389): Warning: Unable to parse the response  to the endReplication extended operation.
[11/Apr/2018:15:28:09.367467787 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa34.bph.cxn" (ipa34:389): Warning: Unable to parse the response  to the endReplication extended operation.
[11/Apr/2018:16:32:22.833697506 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa34.bph.cxn" (ipa34:389): Warning: Unable to parse the response  to the endReplication extended operation.
[12/Apr/2018:10:58:58.431148081 +0200] NSMMReplicationPlugin - Beginning total update of replica "agmt="cn=ipa35.bph.cxn-to-ipa15.bpo.cxn" (ipa15:389)".
[12/Apr/2018:10:58:58.568349548 +0200] NSMMReplicationPlugin - agmt="cn=ipa35.bph.cxn-to-ipa15.bpo.cxn" (ipa15:389): Total update flow control gives time (2000 msec) to the consumer before sending more entries [ msgid sent: 1227, rcv: 226])
If total update fails you can try to increase nsds5ReplicaFlowControlPause and/or decrease nsds5ReplicaFlowControlWindow in the replica agreement configuration
[12/Apr/2018:10:59:04.273524830 +0200] NSMMReplicationPlugin - Finished total update of replica "agmt="cn=ipa35.bph.cxn-to-ipa15.bpo.cxn" (ipa15:389)". Sent 1677 entries.
[root@ipa35 cldb]# ls -la /var/lib/dirsrv/slapd-CXN/cldb/
total 5092
drwxr-xr-x 2 dirsrv dirsrv        7 Feb  6 06:39 .
drwxrwx--- 6 dirsrv dirsrv        6 Feb  6  2017 ..
-rw------- 1 dirsrv dirsrv 34635776 Apr 12 13:27 6fb22814-ec8911e6-add8aa7e-1c0f9c30_58987d9e000000040000.db
-rw-r--r-- 1 dirsrv dirsrv        0 Feb  6 06:39 6fb22814-ec8911e6-add8aa7e-1c0f9c30.sema
-rw------- 1 dirsrv dirsrv    24576 Feb  6 06:40 ac7e1f70-ec8911e6-add8aa7e-1c0f9c30_58987e19000000060000.db
-rw-r--r-- 1 dirsrv dirsrv        0 Feb  6 06:39 ac7e1f70-ec8911e6-add8aa7e-1c0f9c30.sema
-rw------- 1 dirsrv dirsrv       30 Feb  6  2017 DBVERSION
[root@ipa35 cldb]# dbscan -f /var/lib/dirsrv/slapd-CXN/cldb/6fb22814-ec8911e6-add8aa7e-1c0f9c30_58987d9e000000040000.db | grep 5a0a27d9000000060000
[root@ipa35 cldb]# dbscan -f /var/lib/dirsrv/slapd-CXN/cldb/ac7e1f70-ec8911e6-add8aa7e-1c0f9c30_58987e19000000060000.db | grep -A 256 5a0a27d9000000060000
dbid: 5a0a27d9000000060000
	replgen: 1510756646 Wed Nov 15 15:37:26 2017
	csn: 5a0a27d9000000060000
	uniqueid: b568b957-ea1911e6-ab7bfbcb-4e44303b
	dn: cn=MasterCRL,ou=crlIssuingPoints,ou=ca,o=ipaca
	operation: modify
		crlSize: 010
		revokedCerts: �
		unrevokedCerts: �
		expiredCerts: �
		firstUnsaved: -1
		modifiersName: uid=pkidbuser,ou=people,o=ipaca
		modifyTimestamp: 20171113231638Z
[root@ipa35 cldb]#