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

asked 2016-03-10 11:03:55 -0600

z-obaze gravatar image

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


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Did you ever resolve this? I noticed some instances take significantly longer to launch than others. And those have a base image locally stored on the compute node(s) (shared storage). I have no idea why, because if I rename the base image the clone process finishes successfully.

eblock gravatar imageeblock ( 2018-10-04 07:08:16 -0600 )edit

I'm running Ocata. Nova imports the base image back to Ceph so the instance has no parent data, so it's a flat image which contradicts the concept of using Ceph as backend. I didn't find the reason yet...

eblock gravatar imageeblock ( 2018-10-04 07:09:55 -0600 )edit