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Have you thought about dedicated pools for cinder/nova and a separate pool for glance, and any other uses you might have?
You need to setup secrets on kvm, but you can have cinder creating volumes from glance images quickly in different pools

> On Oct 10, 2016, at 6:29 AM, Adam Kijak <adam.kijak at corp.ovh.com> wrote:
> 
> Hello,
> 
> We use a Ceph cluster for Nova (Glance and Cinder as well) and over time,
> more and more data is stored there. We can't keep the cluster so big because of 
> Ceph's limitations. Sooner or later it needs to be closed for adding new 
> instances, images and volumes. Not to mention it's a big failure domain.
> 
> How do you handle this issue?
> What is your strategy to divide Ceph clusters between compute nodes?
> How do you solve VM snapshot placement and migration issues then
> (snapshots will be left on older Ceph)?
> 
> We've been thinking about features like: dynamic Ceph configuration
> (not static like in nova.conf) in Nova, pinning instances to a Ceph cluster etc.
> What do you think about that?
> 
> 
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