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On mié, feb 10, 2016 at 12:41:42 +0200, Mārtiņš Jakubovičs wrote:
> Hello,
> 
> Looks like it is not working, when I try to resize instance I receive:
> Server disk was unable to be resized because: Resize to zero disk flavor is
> not allowed.
> 

Sorry Mārtiņš, my previous comment wasn't completely correct. 

I'm assuming that you're using Ceph as a cinder backend and using
instances with the root filesystem defined in a volume, so you want
to resize your instances without modify the size of the volume, just
modify RAM and vCPU, right?

In that case you can define several flavors with 0 GiB of disk size
and resize up and down your instances between these flavors, but not
with other flavors with a disk size greater than 0 GiB defined. 

Regards,

Alberto