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IDS Forum

redundant connection manager configuration using H

Posted By: Justin Killen
Date: Friday, 31 May 2013, at 5:15 p.m.

Given the following geographical setup:


SiteA SiteB

Where HQ has an HDR primary and an HDR secondary pair, and each of the remote sites (SiteA and SiteB) have an RSS.

What we want to accomplish is to have connections coming from HQ to be load balanced across the HDR primary and HDR secondary, but to have SiteA point to it's RSS and SiteB point to it's RSS. In the event that both the HDR primary and HDR secondary fail, HQ users should be directed to either RSS server (in read-only mode). In the event that an RSS goes down, connections should be directed at the HDR primary/secondary pair until the RSS comes back online. In the event that WanA/WanB goes down, their corresponding site should then become read-only (insert/updates fail). Furthermore, the HDR should be promoted to primary in the case of failure on the primary, but neither RSS should ever be promoted. Also, we'd like to setup redundant connection manager instances (one per server) for client connection availability.

The point we're stumped at is how to configure the configuration manager instances. At first thought, I created a cluster entry with two SLA's - one for HQ and one for SiteA/SiteB that looks like this:

CLUSTER cluster_hq
INFORMIXSERVER hq_prim, hq_sec, siteARss, siteBRss

SLA cm_hq DBSERVERS=(primary,HDR),RSS


My issue here is that I don't understand how Informix knows which RSS to use for remote sites. Obviously the POLICY=LATENCY means to use latency as a determining factor, but what order does this happen in? I.e. does that line mean to look at each of the RSS, primary, and HDR secondaries and connect to the one with the least latency, or does it mean to look only at RSS servers and connect to the lowest latency but then revert to the HDR pair only if no RSS servers are available?

Also, if I run this configuration for the remote sites' connection manager, won't it try to promote the HDR secondary to a primary if a WAN link goes down? or is this information just passed to the connection manager on the client computers so they know what connection manager instance to connect to next?

Because of the failover differences, I think it might be best to setup two clusters, one for HQ and one for each remote site, like this:

CLUSTER cluster_hq
INFORMIXSERVER hq_prim, hq_sec, siteARss, siteBRss

SLA cm_hq DBSERVERS=(primary, HDR), RSS


CLUSTER cluster_siteA
INFORMIXSERVER hq_prim, hq_sec, siteARss

SLA cm_sitea DBSERVERS=RSS, (primary, HDR)


CLUSTER cluster_siteB
INFORMIXSERVER hq_prim, hq_sec, siteBRss

SLA cm_siteb DBSERVERS=RSS, (primary, HDR)


The downside of this is that it doesn't seem very scalable to me, so I'd like to stick with fewer CM clusters. One I think would be best, or maybe two - one for HQ and one for remote sites.

I get the impression that I'm over-thinking this and that it has already been done, so any opinions would be welcomed. We purchased the redbook "IBM Informix Flexible Grid, Extending Data Availability" (ISBN 978-0-7384-3569-5); it does a pretty good job of describing how to set things up, but not such a great job on differentiating core technologies and why you would use one thing over another. If anybody has ideas to expand our reading list, we'd appreciate that info as well.


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