From: Gavin Henry <ghenry@openldap.org>
Date: Thu, 29 Nov 2007 17:52:30 +0000 (+0000)
Subject: MMR intro complete. Example to come.
X-Git-Tag: OPENLDAP_REL_ENG_2_4_9~20^2~381
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=ee41994407609f03e58b66d4a353681602873d23;p=openldap

MMR intro complete. Example to come.
---

diff --git a/doc/guide/admin/replication.sdf b/doc/guide/admin/replication.sdf
index c0ece9b758..6bd3a9cf5c 100644
--- a/doc/guide/admin/replication.sdf
+++ b/doc/guide/admin/replication.sdf
@@ -156,16 +156,27 @@ data to multiple Master Directory servers.
 
 * Advantages of Multi-Master replication:
 
-- If any master fails, other masters will continue to accept updates.
+- If any master fails, other masters will continue to accept updates
+- Avoids a single point of failure
 - Masters can be located in several physical sites i.e. distributed across the 
 network/globe.
-- Good for Disaster Recovery
+- Good for Automatic failover/High Availability
 
-* Disadvantages of Multi-Master replication :
+* Disadvantages of Multi-Master replication:
+
+- It has {{B:NOTHING}} to do with load balancing
+- {{URL:http://www.openldap.org/faq/data/cache/1240.html}}
+- If connectivity with a master is lost because of a network partition, then 
+"automatic failover" can just compound the problem
+- Typically, a particular machine cannot distinguish between losing contact
+ with a peer because that peer crashed, or because the network link has failed
+- If a network is partitioned and multiple clients start writing to each of the 
+"masters" then reconciliation will be a pain; it may be best to simply deny 
+writes to the clients that are partitioned from the single master
+- Masters {{B:must}} propagate writes to {{B:all}} the other servers, which 
+means the network traffic and write load is constant and spreads across all 
+of the servers
 
-http://www.connexitor.com/blog/pivot/entry.php?id=105#body
-http://www.openldap.org/lists/openldap-software/200702/msg00006.html
-http://www.openldap.org/lists/openldap-software/200602/msg00064.html
 
 This is discussed in full in the {{SECT:N-Way Multi-Master}} section below
 
@@ -588,6 +599,9 @@ cookie stored in the consumer replica database.
 
 H2: N-Way Multi-Master
 
+Import and expand from link:
+
+{{URL:http://blog.suretecsystems.com/archives/40-OpenLDAP-Weekly-News-Issue-5.html#extended}}
 
 H2: MirrorMode