Re: RBD thin provisioning and time to format a volume

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On Wed, Jul 8, 2020 at 4:56 PM Jason Dillaman <jdillama@xxxxxxxxxx> wrote:

> On Wed, Jul 8, 2020 at 3:28 PM Void Star Nill <void.star.nill@xxxxxxxxx>
> wrote:
> >
> > Hello,
> >
> > My understanding is that the time to format an RBD volume is not
> dependent
> > on its size as the RBD volumes are thin provisioned. Is this correct?
> >
> > For example, formatting a 1G volume should take almost the same time as
> > formatting a 1TB volume - although accounting for differences in
> latencies
> > due to load on the Ceph cluster. Is that a fair assumption?
>
> Yes, that is a fair comparison when creating the RBD image. However, a
> format operation might initialize and discard extents on the disk, so
> a larger disk will take longer to format.


Thanks for the response Jason. Could you please explain a bit more on the
the format operation?

Is there a relative time that we can determine based on the volume size?

Thanks
Shridhar



>
> > Thanks,
> > Shridhar
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> >
>
>
> --
> Jason
>
>
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