On Thu, Oct 22, 2009 at 6:47 PM, Quanah Gibson-Mount quanah@zimbra.com wrote:
--On Thursday, October 22, 2009 4:34 PM -0400 Sam Tran stlist@gmail.com wrote:
Hi All,
I am looking to upgrade our OL 2.3 platform to OL 2.4.
For all write operations, I'd like to have two masters in Mirror Mode configuration and behind a load balancer with a virtual IP (VIP) address. All read operations will be performed on a set of replicas. The replication mode would be delta-syncrepl. I am trying to figure out how to configure replication between the replicas and the masters. I came across those two threads that seem to address this issue:
http://www.openldap.org/lists/openldap-devel/200903/msg00085.html http://www.openldap.org/lists/openldap-software/200903/msg00127.html
If I understand correctly, there are two possible configurations:
- On each replica, create a single syncrepl stanza that points to the
load balancer VIP.
- On each replica, creates two syncrepl stanzas, each one pointing to
a different master.
Could you please confirm that both configurations would work? Should the second configuration be favored over the first for it does not depend on the load balancer?
I don't know the answer, but let me know when you figure it out. ;) I'd guess the first option would be best, since only one master will be receiving the writes as well, since you'll be using mirror mode.
I was planning to use the load balancer in the 2nd configuration as well. In both cases only a single master will receive the write requests. The 2nd configuration would still work in the event of a failure of the load balancer.