Hello experts

 

Currently using openstack Xena and Ceph backend (Pacific 16.2.7)

 

It seems there is a bug (since Wallaby?) where the efficient use of a CEPH Pacific RBD backend (i.e with copy-on-write-cloning) is not working .

Show_image_direct_url needs to be False to create volumes (or ephemeral volumes for nova)

 

This can of course be tremendously slow (Nova  , ephemeral root disk) without copy-on-write cloning feature of Ceph.

 

As Ceph RBD is THE most favourite  backend for block storage in openstack I am wondering how others are coping (or workarounds found ?)

Which combinations of Openstack and Ceph  are known to work well with copy-on-write-cloning?

 

How is the noted GRAVE Security RISK  of enabling Show_image_direct_url mitigated  ?  (i.e I think , for CEPH RBD, it needs to  be True to get cloning to work efficiently)

 

 

See another report of this issue here:

Re: Ceph Pacifif and Openstack Wallaby - ERROR cinder.scheduler.flows.create_volume — CEPH Filesystem Users (spinics.net)

 

Thanks for any help or pointers,

 

Andrew West

Openstack consulting

CGG France

 

 

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