Open Stack

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)<https://www.spinics.net/lists/ceph-users/msg66016.html>

Thanks for any help or pointers,

Andrew West
Openstack consulting
CGG France


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