Dear List , I am testing on Openldap-2.4.7 multi-master replication , and I had been read Openldap Admin page for a while already ( URL : http://www.openldap.org/doc/admin24/replication.html#delta-syncrepl%20replic... )
Now I get confuse on " N-Ray Multi-Master " & " Mirror Mode Multi-Master " Hope somebody else could help.
Testing enviorment: I got 3 office. Office A / Office B & Office C. Each office I got 2 x LDAP Server ( Totally 6 Openldap 2.4.7 )
Office A Openldap Server 1 = Server A1 Office A Openldap Server 2 = Server A2 Office B Openldap Server 1 = Server B1 Office B Openldap Server 2 = Server B2 Office C Openldap Server 1 = Server C1 Office C Openldap Server 2 = Server C2
The things I want : Each node could " Read & Write " on it's own database and replication the other 5 left Openldap Server.
Question : I suppose to be use N-Ray Multi-Master OR Mirror Mode Multi-master ?
Question about N-Ray Multi-Master. ( Assume I have 6 physical Openldap 2.4.7 * Fresh Install * )
1. If I am looking to setup N-Ray Multi-Master , is that I need to make all 6 node as Provide And Consumer on each openldap servers slapd.conf ?
2. For consumer config in slapd.conf * assume i do a simple concumer config in Server A1 ) , is that I need point all the providers servers infomration in ServerA1 slapd.conf ?
3. IF Office A / Office & Office C VPN network is down and get resume after 10 mins, what's the recover procedure that I could make sure that all server by using same version of " Database" and each node database is consistence ?
Question about Mirror Mode mode Multi-Master. 1. Is that Multi-Master Mirror Mode only could support more than 2 x Openldap servers which's by usning Multi-Master Replication ? 2. Refer Question 1. Is that Multi-Master only allow to WRITE on 1 of 2 servers at the same time? 3. Is that possible make all 6 x Openldap Servers running as N-Ray + Mirror Mode Mode Multi-Master ( IF Mirror mode could support more than 2 x openldap-servers )
At last just want to understand that is there anyway make each node as multi-master and able to read / write it's own database & replication together.
4. IF Office A / Office & Office C VPN network is down and get resume after 10 mins, what's the recover procedure that I could make sure that all server by using same version of " Database" and each node database is consistence ?
Many thanks all of your help , and looking forward your reply .
From Data Leung.
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On Monday 07 January 2008 05:10:25 Data Leung wrote:
Dear List , I am testing on Openldap-2.4.7 multi-master replication , and I had been read Openldap Admin page for a while already ( URL : http://www.openldap.org/doc/admin24/replication.html#delta-syncrepl%20repli cation )
Now I get confuse on " N-Ray Multi-Master " & " Mirror Mode Multi-Master " Hope somebody else could help.
The primary difference between N-Way Multi-Master and Mirror Mode is that Mirror Mode is limited to two masters. Thus, it seems only N-Way is suitable for you. However, I would have considered a configuration with 3 masters (to reduce the network traffic, while still allowing each site to write, and having read redundancy in the site).
Regards, Buchan
I thought N-Way was true multimaster and not a hot standby method ? MultiMaster Mirror Mode is mirroring of the data, likeRAID 1. The data is written to one and mirrored to the other, no matter which unit in the one or the other. However, you can't have two writes to record X at the same time on both systems .
N-Way handles that I thought? (now that I think about I guess I don't see specifics documented anywhere on how it does that ?))
Sellers
On Jan 7, 2008, at 11:48 AM, Buchan Milne wrote:
On Monday 07 January 2008 05:10:25 Data Leung wrote:
Dear List , I am testing on Openldap-2.4.7 multi-master replication , and I had been read Openldap Admin page for a while already ( URL : http://www.openldap.org/doc/admin24/replication.html#delta-syncrepl%20repli cation )
Now I get confuse on " N-Ray Multi-Master " & " Mirror Mode Multi- Master " Hope somebody else could help.
The primary difference between N-Way Multi-Master and Mirror Mode is that Mirror Mode is limited to two masters. Thus, it seems only N-Way is suitable for you. However, I would have considered a configuration with 3 masters (to reduce the network traffic, while still allowing each site to write, and having read redundancy in the site).
Regards, Buchan
______________________________________________ Chris G. Sellers | NITLE Technology 734.661.2318 | chris.sellers@nitle.org AIM: imthewherd | GTalk: cgseller@gmail.com
Chris G. Sellers wrote:
I thought N-Way was true multimaster and not a hot standby method ? MultiMaster Mirror Mode is mirroring of the data, likeRAID 1. The data is written to one and mirrored to the other, no matter which unit in the one or the other. However, you can't have two writes to record X at the same time on both systems .
N-Way handles that I thought? (now that I think about I guess I don't see specifics documented anywhere on how it does that ?))
Yes, it does. True Multi-Master.
openldap-software@openldap.org
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Buchan Milne -
Chris G. Sellers -
Data Leung -
Gavin Henry