Why does "df" on a cephfs not report same free space as "rados df" ?

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Hi folks,

My ceph cluster is used exclusively for cephfs, as follows:

---
root@node1:~# grep ceph /etc/fstab
node2:6789:/ /ceph ceph auto,_netdev,name=admin,secretfile=/root/ceph.admin.secret
root@node1:~#
---

"rados df" shows me the following:

---
root@node1:~# rados df
POOL_NAME          USED  OBJECTS CLONES    COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED    RD_OPS      RD    WR_OPS      WR
cephfs_metadata 197 MiB    49066      0     98132                  0       0        0   9934744  55 GiB  57244243 232 GiB
media           196 TiB 51768595      0 258842975                  0       1   203534 477915206 509 TiB 165167618 292 TiB

total_objects    51817661
total_used       266 TiB
total_avail      135 TiB
total_space      400 TiB
root@node1:~#
---

But "df" on the mounted cephfs volume shows me:

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root@node1:~# df -h /ceph
Filesystem          Size  Used Avail Use% Mounted on
10.20.30.22:6789:/  207T  196T   11T  95% /ceph
root@node1:~#
---

And ceph -s shows me:

---
  data:
    pools:   2 pools, 1028 pgs
    objects: 51.82 M objects, 196 TiB
    usage:   266 TiB used, 135 TiB / 400 TiB avail
---

"media" is an EC pool with size of 5 (4+1), so I can expect 1TB of data to consume 1.25TB raw space.

My question is, why does "df" show me I have 11TB free, when "rados df" shows me I have 135TB (raw) available?


Thanks!
D

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