Dear Cephalopodians, as many others, I'm also a bit confused by "ceph df" output in a pretty straightforward configuration.
We have a CephFS (12.2.7) running, with 4+2 EC profile.
I get:
----------------------------------------------------------------------------
# ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
824T 410T 414T 50.26
POOLS:
NAME ID USED %USED MAX AVAIL OBJECTS
cephfs_metadata 1 452M 0.05 860G 365774
cephfs_data 2 275T 62.68 164T 75056403
----------------------------------------------------------------------------
So about 50 % of raw space are used, but already ~63 % of filesystem space are
used.
Is this purely from imperfect balancing?
In "ceph osd df", I do indeed see OSD usages spreading from 65.02 % usage down
to 37.12 %.
We did not yet use the balancer plugin.
We don't have any pre-luminous clients.
In that setup, I take it that "upmap" mode would be recommended - correct?
Any "gotchas" using that on luminous?
Cheers,
Oliver
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