Re: Thick provisioning

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> Op 17 oktober 2017 om 19:38 schreef Jason Dillaman <jdillama@xxxxxxxxxx>:
> 
> 
> There is no existing option to thick provision images within RBD. When
> an image is created or cloned, the only actions that occur are some
> small metadata updates to describe the image. This allows image
> creation to be a quick, constant time operation regardless of the
> image size. To thick provision the entire image would require writing
> data to the entire image and ensuring discard support is disabled to
> prevent the OS from releasing space back (and thus re-sparsifying the
> image).
> 

Indeed. It makes me wonder why anybody would want it. It will:

- Impact recovery performance
- Impact scrubbing performance
- Utilize more space then needed

Why would you want to do this Sinan?

Wido

> On Mon, Oct 16, 2017 at 10:49 AM,  <sinan@xxxxxxxx> wrote:
> > Hi,
> >
> > I have deployed a Ceph cluster (Jewel). By default all block devices that
> > are created are thin provisioned.
> >
> > Is it possible to change this setting? I would like to have that all
> > created block devices are thick provisioned.
> >
> > In front of the Ceph cluster, I am running Openstack.
> >
> > Thanks!
> >
> > Sinan
> >
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@xxxxxxxxxxxxxx
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> 
> 
> 
> -- 
> Jason
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