Hello Jason,
Yes, I believe that is my question. Is there any way I can either reclaim
the space for this disk?
On Wed, Apr 27, 2016 at 1:25 PM, Jason Dillaman <jdill...@redhat.com> wrote:
> The image size (50G) minus the fstrim size (1.7G) approximately equals
> the actual usage (48.19G). Therefore, I guess the question is why
> doesn't fstrim think it can discard more space?
>
> On a semi-related note, we should probably improve the rbd copy
> sparsify logic. Right now it requires the full stripe period (or
> object size if striping is disabled) to be zeroes before it skips the
> write operation to the destination.
>
> On Wed, Apr 27, 2016 at 2:26 PM, Tyler Wilson <k...@linuxdigital.net>
> wrote:
> > Hello Jason,
> >
> > Thanks for the quick reply, this was copied from an VM instance snapshot
> to
> > my backup pool (rbd snap create, rbd cp (to backup pool), rbd snap rm).
> I've
> > tried piping through grep per your recommendation and it still reports
> the
> > same usage
> >
> > $ rbd diff backup/cd4e5d37-3023-4640-be5a-5577d3f9307e | grep data | awk
> '{
> > SUM += $2 } END { print SUM/1024/1024 " MB" }'
> > 49345.4 MB
> >
> > Thanks for the help.
> >
> > On Wed, Apr 27, 2016 at 12:22 PM, Jason Dillaman <jdill...@redhat.com>
> > wrote:
> >>
> >> On Wed, Apr 27, 2016 at 2:07 PM, Tyler Wilson <k...@linuxdigital.net>
> >> wrote:
> >> > $ rbd diff backup/cd4e5d37-3023-4640-be5a-5577d3f9307e | awk '{ SUM +=
> >> > $2 }
> >> > END { print SUM/1024/1024 " MB" }'
> >> > 49345.4 MB
> >>
> >> Is this a cloned image? That awk trick doesn't account for discarded
> >> regions (i.e. when column three says "zero" instead of "data"). Does
> >> the number change when you pipe the "rbd diff" results through "grep
> >> data" before piping to awk?
> >>
> >> > Could this be affected by replica counts some how? It seems to be
> twice
> >> > as
> >> > large as what is reported in the filesystem which matches my replica
> >> > count.
> >>
> >> No, the "rbd diff" output is only reporting image data and zeroed
> >> extents -- so the replication factor is not included.
> >>
> >> --
> >> Jason
> >
> >
>
>
>
> --
> Jason
>
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