Re: Issues/questions: ceph df (luminous 12.2.7)

[Sébastien VIGNERON <sebastien.vigneron@xxxxxxxxx>]

Hi,

Le 21 juil. 2018 à 11:52, Marc Roos <m.roos@xxxxxxxxxxxxxxxxx> a écrit :

1. Why is ceph df not always showing 'units' G M k

Ceph default plain output show human readable values.

[@c01 ~]# ceph df
GLOBAL:
   SIZE       AVAIL      RAW USED     %RAW USED
   81448G     31922G       49526G         60.81
POOLS:
   NAME                              ID     USED       %USED     MAX
AVAIL     OBJECTS
   iscsi-images                      16         37         0         
2652G           4
   rbd                               17       873G     24.77         
2652G      257543
   fs_meta                           19       198M         0         
2652G     2482049
   fs_data                           20     10662G     80.08         
2652G     9260560
   default.rgw                       22          0         0         
2652G           0
   .rgw.root                         23       1283         0         
2652G           4
   default.rgw.control               24          0         0         
2652G           8
   .rgw.gc                           25          0         0         
2652G           0
   .rgw.buckets                      26          0         0         
2652G           0
   .rgw.buckets.index                27          0         0         
2652G           0
   .rgw.buckets.extra                28          0         0         
2652G           0
   default.rgw.log                   29       2431         0         
2652G         216


2. Why is iscsi-images showing 37GB, while it should be 30GB? And why 4
objects instead of 3?

It's not 37GB, it's 37 bytes. Type the following command to output in json format and you will always have values in bytes :

ceph df --format json | jq '.'

or (in table format):

(header="pool bytes_used max_avail"; echo "$header"; echo "$header" | tr '[[:alpha:]_]' '-'; ceph df --format json | jq -r '.pools[]|(.name,.stats.bytes_used,.stats.max_avail)' | paste - - -) | column -t

You can see how much space your RBDs take (used over provisioned space) pool by pool.

(See https://www.spinics.net/lists/ceph-users/msg46369.html or https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg47806.html)

[@c01 ~]# rbd ls -p iscsi-images
test
[@c01 ~]# rbd info iscsi-images/test
rbd image 'test':
       size 10240 MB in 2560 objects
       order 22 (4096 kB objects)
       block_name_prefix: rbd_data.1bfcc12ae8944a
       format: 2
       features: layering, exclusive-lock
       flags:
       create_timestamp: Sat Jul  8 14:20:17 2017
[@c01 ~]# ceph osd pool get iscsi-images size
size: 3
[@c01 ~]# rbd snap ls iscsi-images/test
[@c01 ~]#





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