Opinions on load balancing and failover mechanisms

[Mike Lindsey]

There are a lot of options..  DNX, Merlin, mod_gearman to name a few...  
I could read the docs (and have read a good portion of some of them) and 
could implement test environments (and will eventually need to) but 
first I want opinions from people who've done this at large scale.

I need to improve on our load distribution and failover mechanisms.  
Right now worker node outages are handled through freshness checking, 
and master node outages are handled through a load balanced vip and some 
fancy cron jobs that kick up a cold spare.

What are the better options for local load distribution and geographic 
master failover?  Which options will better handle thousands of servers 
across a dozen colos, in half a dozen countries, when the goal is that 
no single host (or colo!) going offline can be allowed to have an effect 
on any other subset of the infrastructure?  Which options should I avoid?

Currently running Nagios Core 3.2.1 with NSCA 2.9 on mostly FreeBSD 
systems.  Soon that should be Core 3.3, with XI on top, plus whatever 
load distribution mechanism wins the dog fight.

-- 
Mike Lindsey


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