This might be slightly off topic though many of ceph users might have run into similar issues. For one of our Grizzly Openstack environment, we are using Ceph/RBD as the exclusive image and volume storage for VMs, which are booting from rbd backed Cinder volumes. As a result, nova image cache is being used at all. For some reasons, nova still creates image cache under /var/lib/nova/_base on nova nodes. This fills up our shared /var/lib/nova/instances (with NFS) directory. This NFS share has limited size (50GB) which is used to store config drive and enable VM failover/restart during HW failure. Does anyone know how to disable nova image caching function completely? Or suggestion to best deal with this issue? We know we can do aggressive clearing with some of the nova image cache management configuration but that doesn't help reducing the extra IO overhead of caching image on the nova nodes. Thanks. --weiguo
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