Hi Erno,
I have a Xena setup with Ceph. When create a snapshot of an image, it is a full copy. When create a volume from an image, it is an incremental copy. show_multiple_locations is true. show_image_direct_url doesn't seem having effect, true or false, the same result.
With Ussuri, both of above 2 creations are incremental copy.
Is there any way we can do incremental snapshot for image?
Thanks! Tony ________________________________________ From: Erno Kuvaja ekuvaja@redhat.com Sent: March 16, 2022 06:33 AM To: west, andrew Cc: openstack-discuss@lists.openstack.org Subject: Re: Xena and CEPH RBD backend (show_image_direct_url status )
On Thu, Feb 24, 2022 at 2:37 PM west, andrew <andrew.west-contractor@cgg.commailto:andrew.west-contractor@cgg.com> wrote: 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
________________________________ “This e-mail and any accompanying attachments are confidential. The information is intended solely for the use of the individual to whom it is addressed. Any review, disclosure, copying, distribution, or use of the email by others is strictly prohibited. If you are not the intended recipient, you must not review, disclose, copy, distribute or use this e-mail; please delete it from your system and notify the sender immediately.”
Hi Andrew,
Sorry for the delayed reply. I got distracted and forgot after the first time I noticed this.
So far I see you only mentioning 'show_image_direct_url' setting but AFAIK also the 'show_multiple_locations' is required for these features to work, is that set true and the issue still persists?
- jokke