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Thank you a lot for the help!

I think that the problem can be solved using the anti-affinity filter, but we want a regular user can choose an instance and set the property(image, flavour, network, etc.) and a parameter Robustness >= 1(that is the number of copies of this particular instance).

After that, we put every copy of this instance in a different compute, but we need to track where we put every copy of the instance (we need to know it for the algorithm that we would implement);

EXAMPLE. With 4 compute nodes

User create an instance(Server_1) with Robustness = 3.

Server_1_copy1 ==> compute2
Server_1_copy2 ==> compute1
Server_1_copy3 ==> compute4

User create another instance (Host_1) with Robustness = 2

Host_1_copy1 ==> compute2
Host_1_copy2 ==> compute3

and we want to track in a table where are the copies of a particular instance.
For Server_1

copy1 ==> compute2 
copy2 ==> compute1
copy3 ==> compute4

same thing for Host_1
copy1 ==> compute2
copy2 ==> compute3

I hope that now is more clear.
In your opinion what is the best way to do it?

Best Regards Giuseppe

> Il giorno 02 mag 2017, alle ore 22:08, Matt Riedemann <mriedemos at gmail.com> ha scritto:
> 
> On 5/2/2017 2:15 PM, Chris Friesen wrote:
>> It sounds to me that the problem could be solved by specifying
>> --min-count and --max-count to specify the number of copies, and using
>> server groups with the anti-affinity filter to ensure that they end up
>> on different compute nodes.
> 
> This is exactly what I was thinking. What else is involved or needed that existing parts of the compute API don't already provide for that use case?
> 
> -- 
> 
> Thanks,
> 
> Matt
> 
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