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Dear All , I face a problem as below environment. a.) 4 x Openldap 2.4.8 which's config as N-Way Multi-Master. b.) 4 x XEN Guest host Server running CentOS 5.1 & DB-4.6.21 c.) 4 x XEN Server running time sync every 5 min. d.) Each of the Openldap Database stored information such as: 1. Postfix e-mail account / aliases config 2. Pam-LDAP account entry 3. E-mail Address Book e.) All LDAP Server under the same Local Area Network Config file which's N-Ray Multi-Master related. /usr/local/etc/openldap/slapd.conf For Host A = serverID1 = HOSTA.TEST.COM For Host B = serverID2 = HOSTB.TEST.COM For Host C = serverID3 = HOSTC.TEST.COM For Host D = serverID4 = HOSTD.TEST.COM Below is my case details. 1. There is no problems when I add / remove e-mail related information entry one by one. Each openldap Server could replicate information ( Add / Remove entry ) in short. 2. There is no problems when I add / remove PAM-LDAP login related infomation entry one by one. Each openldap Server could replicate information ( Add / Remove entry ) in short. 3. Thee is no problems when I add / remove e-mail address book entry one by one. each Openldap Server could replicate information ( Add / Remove entry ) in short. Problems I found: 1. When I try to " mass import " E-mail address book from a LDIF file ( 200K LDIF entry which's include 1800 x cn entry ) on HOSTA , HOSTB / HOSTC / HOSTD only able to replicate around 600 ~ 1300 OR some times it could related all the 1800 entry of address book OR the openldap will shown as segment fault and services stop by itself. 2. If HOST A / B / C / D have 1800 LDAP Address book entry under ou=AddressBook,dc=test,dc=com , then I try to delete those 1800 entry. Host A could deleted those 1800 entry in short. But Host B / C / D can't replicate the entry that I delete on HOSTA by itself. That's mean my N-Ray Multi-Master config can't 100% replicate itself database to the other database IF i " MASS INPORT " or " MASS DELETE " entry. Question: a) Is that normal for this case ? b) I'm by using slapd.conf to STARTUP the slapd. And I also try to make use of -F /usr/local/etc/openldap/slapd.d to STARTUP the slapd. Both didn't have different, just want to know. If I am looking for N-Ray Multi-Master. By using slapd.conf OR slapd.d should be the best choice ? c) What kind of log i should provide in this mail list could help for you all , and get help to debug my case ? -d 256 OR -d 1024 while I startup the slapd ? Many thanks for your create help , since N-Ray Multi-Master is new for me , so looking forward all of your help. And looking forward all of your reply. Thanks Below is by DB_CONFIG on HOSTA / HOSTB / HOSTC / HOSTD ======================================================== # one 0.25 GB cache set_cachesize 0 268435456 1 # Data Directory #set_data_dir db # Transaction Log settings set_lg_regionmax 262144 set_lg_bsize 2097152 #set_lg_dir logs ========================================================== Config Symantec which's N-Ray Multi-Master Related. =================================================== HOSTA: serverID1 mirrormode on syncrepl rid=2 provider=ldap://HOSTB.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=3 provider=ldap://HOSTC.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=4 provider=ldap://HOSTD.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" =================================================== HOSTB: serverID2 mirrormode on syncrepl rid=1 provider=ldap://HOSTA.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=3 provider=ldap://HOSTC.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=4 provider=ldap://HOSTD.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" ==================================================== HOSTC: serverID3 mirrormode on syncrepl rid=1 provider=ldap://HOSTA.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=2 provider=ldap://HOSTB.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=4 provider=ldap://HOSTD.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" ============================================ HOSTD: serverID4 mirrormode on syncrepl rid=1 provider=ldap://HOSTA.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=2 provider=ldap://HOSTB.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" syncrepl rid=3 provider=ldap://HOSTC.TEST.COM bindmethod=simple binddn="cn=manager,dc=test,dc=com" credentials=secret searchbase="dc=test,dc=com" schemachecking=on type=refreshAndPersist retry="60 +" ===================================================== Invite your mail contacts to join your friends list with Windows Live Spaces. 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