Better output of ceph df

[Chen, Xiaoxi]

Hi list,
I tried to understand the output of "CEPH DF" , finally I got it but it's really confusing in the POOLS section, so I sent out the mail and see if any good suggestion to make it better.

Here is an example from my cluster
GLOBAL:
SIZE AVAIL RAW USED %%RAW USED
8153G 5962G 2191G 26.88
POOLS:
NAME ID USED %%USED MAX AVAIL SIZE
base_tier 1 960G 11.77 2647G 245793
cache_tier 2 134G 1.65 212G 34526

Currently, the
USED = how many data in particular pool , so my base_tier has 960G data and cache_tier has 134G data
%%USED = USED /GLOBAL.SIZE, this is really strange, users are likely to think the %%USED should be USED/ POOL.CAPACITY
%%MAX_AVAIL = how many available space in particular pool ,calculated by max( osdi.avail / osdi. weight)
OBJECTS = how many objects in the pool

I think it would be better to have
POOLS:
NAME ID SIZE OBJECTS USED %%USED MAX_AVAIL
base_tier 1 7878G 245793 960G 12.29 2647G
cache_tier 2 346G 34526 134G 38.72 212G



What do you think? Any impact to other tools?
Xiaoxi
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