Ceph » mgr » Dashboard

Description of problem¶

Filesystem pool size should use stored stat instead of bytes_used.

CephFS pool stats percent_used reports ~60% used:

[ceph: root@ceph0 /]# ceph df -f json | jq .pools[2]
{
  "name": "cephfs",
  "id": 3,
  "stats": {
    "stored": 10414261796864,
    "objects": 8814736,
    "kb_used": 20335999808,
    "bytes_used": 20824063803392,
    "percent_used": 0.5955945253372192,
    "max_avail": 7069713301504
  }
}

The dashboard does not match the percent used.

Environment¶

• ceph version string: ceph version 15.2.10 (27917a557cca91e4da407489bbaa64ad4352cc02) octopus (stable)
• Platform (OS/distro/release): CentOS Linux release 8.3.2011
• Cluster details (nodes, monitors, OSDs): 4 nodes, 3 monitors, 48 OSDs
• Browser used (e.g.: Version 86.0.4240.198 (Official Build) (64-bit)): Google Chrome Version 89.0.4389.114 (Official Build) (64-bit)

How reproducible¶

Dashboard > Filesystems > Cephfs filesystem details > Pools Detail Table

Actual results¶

Ceph Filesystem Dashboard is incorrect (Reporting 75% instead of 60%):

Expected results¶

Replacing bytes_used with stored returns the expected result:

Additional info¶

This occurs because the dashboard is using bytes_used stat, that looks to be the same as raw bytes used, and max_avail stat which takes replication or erasure coding into consideration.

Requires change in https://github.com/ceph/ceph/blob/master/src/pybind/mgr/dashboard/controllers/cephfs.py on line 259.