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

[Itamar Heim]

On 07/31/2012 04:07 PM, Maxim Burgerhout wrote:
> 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?
>

it is.

> 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.
>

two ways for you to do this today:
1. prefer/pin these VMs to different host
2. use two clusters and put them in different ones

> Regards,
>
> Maxim Burgerhout<mailto:maxim at wzzrd.com>
>
>
>
>
>
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