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Yes, nova-scheduler has lots of filters to check if nova-compute node fit
the requirement of the instance you wanna launch.
Like availability-zone filter, RAM filter, cpu core filter, etc. If all the
compute node failed to pass those filters, it raise this exception.

Regards
Lei


On Tue, May 21, 2013 at 4:13 AM, Aaron Rosen <arosen at nicira.com> wrote:

> Usually means that the instance trying to be launched can't be scheduled
> to any nova-compute nodes. The log message should include a reason why
> though.
>
>
>
>
> On Mon, May 20, 2013 at 12:06 PM, Remo Mattei <remo at mattei.org> wrote:
>
>> Hello everyone,
>>
>> I wonder if someone can give me a more detail overview about the raise
>> exception.NoValidHost
>> on what does raise mean.
>>
>> Thanks
>> Remo
>>
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