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Re: Slaving from Mirror Mode

Mirror-mode is active/passive-fail-over.

The load balancer should be configured to direct traffic to one of them, switching to the other only when the first is down.

- chris

Chris Jacobs
Systems Administrator, Technology Services Group

Apollo Group  |  Apollo Marketing & Product Development  |  Aptimus, Inc.
1501 4th Ave  |  Suite 2500  |  Seattle, WA 98101
direct 206.839.8245  |  cell 206.601.3256  |  Fax 206.644.0628
email: chris.jacobs@apollogrp.edu

----- Original Message -----
From: openldap-technical-bounces@OpenLDAP.org <openldap-technical-bounces@OpenLDAP.org>
To: openldap-technical@openldap.org <openldap-technical@openldap.org>
Sent: Wed Sep 05 02:00:26 2012
Subject: Slaving from Mirror Mode

Dear Folks,

I am having trouble understanding
http://www.openldap.org/doc/admin24/dual_dc.png.  In particular, I do
not understand the exact meaning of the bidirectional arrows, and the
purpose of the upper pair of load balancers.

1, Are the upper load balancers there to chain writes to both mirror
    mode masters?

2. Are the "replica pool" configured to replicate from both masters or
    only from one?

I am setting up mirror mode masters both in the same data centre, with
one slave offsite.  Should all the slaves slave from both masters, or
should they slave from a load balancer which decides which master is
getting the writes at present?

Although our slaves are busy, surviving network issues with data
consistent and correct is very important.  Network outages and strange
disconnects are the rule without automated configuration management
for network devices.
Nick Urbanik http://nicku.org 808-71011 nick.urbanik@optusnet.com.au
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24  ID: BB9D2C24
I disclaim, therefore I am.

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