Xena and CEPH RBD backend (show_image_direct_url status )
andrew.west-contractor at CGG.COM
Thu Feb 24 14:29:25 UTC 2022
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,
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