Thanks Wido. Appreciate quick response.

On Wed, 30 Jan 2019 at 12:27, Wido den Hollander <w...@42on.com> wrote:

>
>
> On 1/30/19 9:12 PM, Void Star Nill wrote:
> > Hello,
> >
> > When a Ceph block device is created with a given size, does Ceph
> > allocate all that space right away or is that allocated as the user
> > starts storing the data?
> >
> > I want to know if we can over provision the Ceph cluster. For example,
> > if we have a cluster with 10G available space, am I allowed to create
> > only 10,  1G volumes? Or can I over provision and assume that each
> > volume is going to be used only up to 50% and allow creation of 20  1G
> > volumes?
> >
>
> Data is not allocated. You can overprovision with RBD as much as you like.
>
> You can provision 1PB of storage on a cluster with just 100TB of usable
> capacity. Ceph/RBD won't prevent you from doing so.
>
> Wido
>
> > Thanks,
> > Shridhar
> >
> >
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@lists.ceph.com
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> >
>
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