Thanks Wido. Appreciate quick response.
On Wed, 30 Jan 2019 at 12:27, Wido den Hollander <wido@xxxxxxxx> 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
>
>
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