[Users] How to force VM's to run on different hosts?

[Maxim Burgerhout]

Hi,

Can someone tell me whether setting positive and negative VM affinity rules
will be at all possible with oVirt at some point in time, i.e. is this on
the roadmap?

I need to be able to tell VM's to run on different hosts, spread them
around, so to speak. For example, domain controllers would be better off
running on as many different hypervisors as possible, the way I see it.
That way, the failure of a single hypervisor has minimal impact on the
infrastructure. I know there is a feature to pin VM's to a single
hypervisor, but that's not quite the same. I would like to group the domain
controllers and then tell them not to run on the same host as other members
of that group as much as possible.

The other way around would be nice as well: have several VM's run on the
same hardware. For example, a three tiered web application would probably
perform better if the VM's are all on the same hypervisor. I know I could
pin them all to the same hypervisor, but still: that's not quite the same.
I want to be able to group the web app VM's and tell them to try to run on
the same hypervisors as the other members of the group, so they can move to
another hypervisor as a group if the need arises.

Apologies if this has been asked before or documented in some place I
haven't looked yet.

Regards,

Maxim Burgerhout <maxim at wzzrd.com>
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