Open Stack

On Mon, 2016-10-10 at 13:29 +0000, Adam Kijak 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.

I'm really keen to hear more about those limitations.


> 
> 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)?

Having played with Ceph and compute on the same hosts, I'm a big fan of
separating them and having dedicated Ceph hosts, and dedicated compute
hosts.  That allows me a lot more flexibility with hardware
configuration and maintenance, easier troubleshooting for resource
contention, and also allows scaling at different rates.

> 
> 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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> rs