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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