Quincy: cephfs "df" used 6x higher than "du"

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Dear All,

We have just built a new cluster using Quincy 17.2.1

After copying ~25TB to the cluster (from a mimic cluster), we see 152 TB used, which is ~6x disparity.

Is this just a ceph accounting error, or is space being wasted?

[root@wilma-s1 ~]# du -sh /cephfs2/users
24T	/cephfs2/users

[root@wilma-s1 ~]# ls -lhd /cephfs2/users
drwxr-xr-x 240 root root 24T Jul 19 12:09 /cephfs2/users

[root@wilma-s1 ~]# df -h /cephfs2/users
Filesystem  Size  Used Avail Use% Mounted on
(SNIP):/    7.1P  152T  6.9P   3% /cephfs2

root@wilma-s1 ~]# ceph df
--- RAW STORAGE ---
CLASS     SIZE    AVAIL     USED  RAW USED  %RAW USED
hdd    7.0 PiB  6.9 PiB  151 TiB   151 TiB       2.10
ssd    2.7 TiB  2.7 TiB   11 GiB    11 GiB       0.38
TOTAL  7.0 PiB  6.9 PiB  151 TiB   151 TiB       2.10

--- POOLS ---
POOL             ID   PGS   STORED  OBJECTS     USED  %USED  MAX AVAIL
.mgr             21    32   90 MiB       24  270 MiB      0    2.2 PiB
mds_ssd          22    32  1.0 GiB   73.69k  3.0 GiB   0.11    881 GiB
ec82pool         23  4096   20 TiB    6.28M   25 TiB   0.38    5.2 PiB
primary_fs_data  24    32      0 B    1.45M      0 B      0    881 GiB


cephfs is using a 8+2 erasure coded data pool (hdd with NVMe db/wal), and a 3x replicated default data pool (primary_fs_data - NVMe)

bluestore_min_alloc_size_hdd is 4096
ceph pool set ec82pool compression_algorithm lz4
ceph osd pool set ec82pool compression_mode aggressive

many thanks for any help

Jake

--
Dr Jake Grimmett
Head Of Scientific Computing
MRC Laboratory of Molecular Biology
Francis Crick Avenue,
Cambridge CB2 0QH, UK.



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