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On 04/09/2014 03:55 AM, Day, Phil wrote:

> I would guess that affinity is more likely to be a soft requirement
> that anti-affinity,  in that I can see some services just not meeting
> their HA goals without anti-affinity but I'm struggling to think of a
> use case why affinity is a must for the service.

Maybe something related to latency?  Put a database server and several 
public-facing servers all on the same host and they can talk to each 
other with less latency then if they had to go over the wire to another 
host?

Chris