[one-users] Ceph and thin provision

[Ruben S. Montero]

OK, Perfect.

I think we missed the original format 2 support from Bill's first
contribution. Being able to pick either format would be perfect.... We can
schedule this for 4.6

I've filled a bug to track the progress:
http://dev.opennebula.org/issues/2568

Cheers

Ruben


On Thu, Dec 12, 2013 at 3:56 PM, Campbell, Bill <
bcampbell at axcess-financial.com> wrote:

> Yes, Dumpling supports format 2 images (I think Bobtail 0.56 was the first
> release that did).
>
> I'll be submitting my modified driver to the development team for
> inclusion/modification (ideally we should be able to select which format we
> want to use, so further modifications would be necessary) and hopefully it
> would be included in the next version.
>
> In the interim, I can share with you the drivers we are using, but be
> advised this would be UNSUPPORTED by the OpenNebula development/support
> team.  It has been working rather well for us though.
>
> ------------------------------
> *From: *"Kenneth" <kenneth at apolloglobal.net>
> *To: *"Bill Campbell" <bcampbell at axcess-financial.com>
> *Cc: *users at lists.opennebula.org
> *Sent: *Thursday, December 12, 2013 9:29:49 AM
>
> *Subject: *Re: [one-users] Ceph and thin provision
>
> This all is good news. And I think this will solve my problem of a bit
> slow (a few minutes) of deploying a VM, that is cloning is really time
> consuming.
>
> Although I really like this RBD format 2, I'm not quite adept yet on how
> to implement it in nebula. And my ceph version is dumpling 0.67, does it
> support rbd format 2?
>
>  If you have any docs, I'd greatly appreciate it. Or rather I'm willing to
> wait a little longer, maybe on the next release of nebula(?), to make rbd
> format 2 to be the default format?
> ---
>
> Thanks,
> Kenneth
> Apollo Global Corp.
>
> On 12/12/2013 09:48 PM, Campbell, Bill wrote:
>
> Ceph's RBD Format 2 images support the copy-on-write clones/snapshots for
> quick provisioning, where essentially the following happens:
>
> Snapshot of Image created --> Snapshot protected from deletion --> Clone
> image created from snapshot
>
> The protected snapshot acts as a base image for the clone, where only the
> additional data is stored in the clone.  See more here:
> http://ceph.com/docs/master/rbd/rbd-snapshot/#layering
>
>
> For our environment here I have modified the included datastore/tm drivers
> for Ceph to take advantage of these format 2 images/layering for
> Non-Persistent images.  It works rather well, and all image functions work
> appropriately for non-persistent images (save as, etc.).  One
> note/requirement is to be using a newer Ceph release (recommend Dumpling or
> newer) and newer versions of QEMU/Libvirt (there were some bugs in older
> releases, but the versions from Ubuntu Cloud Archive for 12.04 work fine).
>   I did submit them for improvement prior to the 4.0 release, but the
> simple format 1 images are the default currently for OpenNebula.
>
> I think this would be a good question for the developers.  Would creating
> the option for Format 2 images (either in the image template as a parameter
> or on the Datastore as a configuration attribute) and then developing the
> DS/TM drivers further to accommodate this option be worth the effort?  I
> can see use cases for both (separate images vs. cloned images having to
> rely on the base image), but cloned images are WAY faster to deploy.
>
> I have the basic code for format 2 images, I think the logic for looking
> up the parameter/attribute and then applying appropriate action should be
> rather simple.  Could collaborate/share if you'd like.
>
> ------------------------------
> *From: *"Kenneth" <kenneth at apolloglobal.net>
> *To: *users at lists.opennebula.org
> *Sent: *Thursday, December 12, 2013 6:11:15 AM
> *Subject: *Re: [one-users] Ceph and thin provision
>
>
> Yes, that is possible. But as I said, all my images were all preallocated
> as I haven't created any image from sunstone.
>
>
> ---
>
> Thanks,
> Kenneth
> Apollo Global Corp.
>
> On 12/12/2013 06:25 PM, Michael wrote:
>
> This doesn't appear to be the case, I've 2TB of images on Ceph and 380GB
> data reported by Ceph (760G after replication). All of these Ceph images
> were created through the Opennebula Sunstone template GUI.
>
> -Michael
>
> On 12/12/2013 09:11, Kenneth wrote:
>
> I haven't tried creating a thin or thick provision in ceph rbd from
> scratch. So basically, I can say that a 100GB disk will consume 100GB RBD
> in ceph (of course it will be 200GB in ceph storage since ceph duplicates
> the disks by default).
>
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-- 
-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
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