Re: Mirror Mode, replicas and delta-syncrepl

[Quanah Gibson-Mount <quanah@zimbra.com>]

--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:
>
> 1) On each replica, create a single syncrepl stanza that points to the
> load balancer VIP.
>
> 2) 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.

--Quanah

--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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