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I would be happy if resize is going to smaller flavor, nova just change 
CPU and RAM, didn't try to change disk to smaller. But it doesn't work. 
In search I found that it should work like that, resize with KVM just 
change CPU and RAM, but disk stay same, if flavor have smaller disk. 
Maybe this is a bug?

Best regards,
Martins

On 2016.02.10. 16:51, Ghe Rivero wrote:
> There could be situations where resizing (up or down) an instance could be an option (like critical non-ha services although this is a real bad policy) but the proper way to operate a cloud is to spin up and kill as many instances as needed. But if you really need to shrink an instance, it's just not a problem of cloud capabilities. The filesystem of your instance must support it (a no go if it's XFS and in case you use ext4, it can be done in offline mode).
>
> Ghe Rivero