> -----Original Message----- > From: Chris Friesen [mailto:chris.frie...@windriver.com] > Sent: 09 April 2014 15:37 > To: openstack-dev@lists.openstack.org > Subject: Re: [openstack-dev] [Nova] Hosts within two Availability Zones : > possible or not ? > > 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? > I can see that as a high-want, but would you actually rather not start the service if you couldn't get it ? I suspect not, as there are many other factors that could affect performance. On the other hand I could imagine a case where I declare its not worth having a second VM at all if I can't get it on a separate server. Hence affinity feels more "soft" and anti-affinity "hard" in terms or requirments.
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