[openstack-dev] [nova][scheduler] Availability Zones and Host aggregates..

John Garbutt john at johngarbutt.com
Wed Mar 26 11:46:41 UTC 2014

Sounds like an extra weighter to try and balance load between your two AZs
might be a nicer way to go.

The easiest way might be via cells, one for each AZ . But not sure we
merged that support yet. But there are patches for that.

On 25 Mar 2014 20:53, "Sangeeta Singh" <singhs at yahoo-inc.com> wrote:

>  Hi,
>  The availability Zones filter states that theoretically a compute node
> can be part of multiple availability zones. I have a requirement where I
> need to make a compute node part to 2 AZ. When I try to create a host
> aggregates with AZ I can not add the node in two host aggregates that have
> AZ defined. However if I create a host aggregate without associating an AZ
> then I can add the compute nodes to it. After doing that I can update the
> host-aggregate an associate an AZ. This looks like a bug.
>  I can see the compute node to be listed in the 2 AZ with the
> availability-zone-list command.
>  The problem that I have is that I can still not boot a VM on the compute
> node when I do not specify the AZ in the command though I have set the
> default availability zone and the default schedule zone in nova.conf.
>  I get the error "ERROR: The requested availability zone is not available"
>  What I am  trying to achieve is have two AZ that the user can select
> during the boot but then have a default AZ which has the HV from both AZ1
> AND AZ2 so that when the user does not specify any AZ in the boot command I
> scatter my VM on both the AZ in a balanced way.
>  Any pointers.
>  Thanks,
> Sangeeta
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