[openstack-dev] OPENSTACK with CEPH storage backend cant down size an instance

Monty Taylor mordred at inaugust.com
Fri Jul 24 19:11:47 UTC 2015

On 07/24/2015 12:47 PM, Clint Byrum wrote:
> Excerpts from James Galvin's message of 2015-07-24 09:08:36 -0700:
>> Hi All
>> I am having some trouble with down sizing an instance,
>> I can resize the instance from say small flavour to medium flavour but when trying to resize the instance back from medium to small
>> I get the following :
>> Error: Failed to perform requested operation on instance "jg-10", the instance has an error status: Please try again later [Error: Flavor's disk is too small for requested image.].
>> I am using ceph as the storage backend clustered over 3 nodes with 3 pools "volumes" "vms" "images"
> In addition to the note already made about reducing filesystem sizes,
> I just want to reaffirm that resize is really not the way you want to
> be using clouds, and IMO should be removed from Nova (but there's enough
> people who disagree with me that it will probably stay).
> Anyway, I suggest never using resize, and just deploying new servers,
> running tests, and then deleting the old ones. Having cloud with
> flexibility and space for this is why you have a cloud.

As a person who runs a system with both long-lived pets and cattle that
we grind in to food, I can attest that we do not use resize. It is a
much longer downtime/risk operation than you want.

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