On Thu, Jun 6, 2019 at 8:00 PM Sage Weil <sage@xxxxxxxxxx> wrote:
>
> Hello RBD users,
>
> Would you mind running this command on a random OSD on your RBD-oriented
> cluster?
>
> ceph-objectstore-tool \
> --data-path /var/lib/ceph/osd/ceph-NNN \
> '["meta",{"oid":"snapmapper","key":"","snapid":0,"hash":2758339587,"max":0,"pool":-1,"namespace":"","max":0}]' \
> list-omap | wc -l
>
> ...and share the number of lines along with the overall size and
> utilization % of the OSD? The OSD needs to be stopped, then run that
> command, then start it up again.
>
6872
ID CLASS WEIGHT REWEIGHT SIZE USE AVAIL %USE VAR PGS
769 hdd 5.45798 1.00000 5.46TiB 2.89TiB 2.57TiB 52.98 1.00 34
Not sure how to classify heavy or light use of snapshots, ceph osd
pool ls detail output is here: https://pastebin.com/CpPwUQgR
-- Dan
> I'm trying to guage how much snapmapper metadata there is in a "typical"
> RBD environment. If you have some sense of whether your users make
> relatively heavy or light use of snapshots, that would be helpful too!
>
> Thanks!
> sage
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