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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

Quoting Mārtiņš Jakubovičs (2016-02-09 12:00:51)
> Hello,
> 
> I can't find documentation about this.
> Is it possible to resize instance down when use CEPH as storage?
> Right now I try to resize down and I receive error:
> 
> Flavor's disk is too small for requested image. Flavor disk is 42949672960
> bytes, image is 21474836480 bytes.
> 
> OS Liberty,
> Ubuntu 14.04 x64,
> CEPH 0.94.5