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Ceph and instances under /var/lib/nova/instances/_base

Hi there,

I currently have one controller+network node, three compute nodes and ceph as backend for glance and nova. I'm using the kilo version.

I have some trouble when i'm creating instances, the instances are well stored in my ceph cluster, I can see them in the right pool, but the problem is there is something also under /var/lib/nova/instances/_base.

As my /var FS is small, i'd like to have nothing under this directory, i'd like to not use the cache files. I tried a lot of thing but nothing works.

All of my images are in raw format.

Thanks for your help