Cephfs free space vs ceph df free space disparity

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Ceph newbie question.

 

I have a disparity between the free space that my cephfs file system is showing and what ceph df is showing.

As you can see below my cephfs file system says there is 9.5TB free however ceph df says there is 186TB which with replication size 3 should equate to 62TB free space.

I guess the basic question is how can I get cephfs to see and use all of the available space?

I recently changed my number of pg’s on the cephfs_data pool from 2048 to 4096 and this gave me another 8TB so do I keep increasing the number of pg’s or is there something else that I am missing? I have only been running ceph for ~6 months so I’m relatively new to it all and not being able to use all of the space is just plain bugging me.

 

# df -h /ceph

Filesystem                                Size  Used Avail Use% Mounted on

X,y,z:/  107T   97T  9.5T  92% /ceph

# ceph df

GLOBAL:

    SIZE        AVAIL       RAW USED     %RAW USED

    495 TiB     186 TiB      310 TiB         62.51

POOLS:

    NAME                ID     USED        %USED     MAX AVAIL     OBJECTS

    cephfs_data         1       97 TiB     91.06       9.5 TiB     156401395

    cephfs_metadata     2      385 MiB         0       9.5 TiB        530590

# ceph osd pool ls detail

pool 1 'cephfs_data' replicated size 3 min_size 1 crush_rule 0 object_hash rjenkins pg_num 4096 pgp_num 4096 last_change 33914 lfor 0/29945 flags hashpspool,nearfull,selfmanaged_snaps stripe_width 0 application cephfs

        removed_snaps [2~2]

pool 2 'cephfs_metadata' replicated size 3 min_size 1 crush_rule 0 object_hash rjenkins pg_num 256 pgp_num 256 last_change 33914 lfor 0/30369 flags hashpspool,nearfull stripe_width 0 application cephfs

 

 

Regards

Robert Ruge

 


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