[openstack-dev] [cinder] dd performance for wipe in cinder

John Griffith john.griffith at solidfire.com
Fri Oct 11 17:12:26 UTC 2013


On Fri, Oct 11, 2013 at 11:05 AM, Jeremy Stanley <fungi at yuggoth.org> wrote:

> On 2013-10-11 10:50:33 -0600 (-0600), Chris Friesen wrote:
> > Sounds like we could use some kind of layer that will zero out
> > blocks on read if they haven't been written by that user.
> [...]
>
> You've mostly just described thin provisioning... reads to
> previously unused blocks are returned empty/all-zero and don't get
> allocated actual addresses on the underlying storage medium until
> written.
>

+1, which by the way was the number one driving factor for adding the thin
provisioning LVM option in Grizzly.

> --
> Jeremy Stanley
>
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