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Hi Georgios,
probably the problem is related with quotas. For some reason they were not
sync when you deleted the instances.
To confirm this, you can increase your quota and then check you can create
new instances.

If you are using Newton you can use "nova-manage project
quota_usage_refresh" to fix the quotas out of sync.

best,
Belmiro


On Tue, Mar 7, 2017 at 7:37 AM, Georgios Dimitrakakis <giorgis at acmac.uoc.gr>
wrote:

> Hello,
>
> I 've rebooted everything several times before posting here without
> success...
>
>
> Any other ideas?
>
> Best,
>
> G.
>
>
>
> You can try to reboot the node and see if it works. Some resources
>> might be locked at libvirt and kvm.
>>
>> 发自我的 iPhone
>>
>> 在 2017年3月7日，上午6:18，Georgios Dimitrakakis <giorgis at acmac.uoc.gr> 写道：
>>>
>>> All,
>>>
>>> I am setting up a new Ocata installation and although no instances are
>>> running or at least not shown neither in Dashboard nor in CLI using the
>>> "nova list" command I am getting a "Quota Exceeded" error.
>>>
>>> Why is this happening and how can I clean it up in order to continue
>>> using it?
>>>
>>> The only thing that I can think of is that I 've tried to spawn several
>>> (maybe 10) instances that went in "Error" state with "No valid hosts found"
>>> error message. Apparently I 've delete the instances afterwards but maybe
>>> these instances are the ones that have hang-up.
>>>
>>> Any help much appreciated!
>>>
>>> All the best,
>>>
>>> George
>>>
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>>
>
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