Look below the raw section at the pools report. Add up the pools on each device class, assuming that you don’t have pools overlapping device classes. STORED is user data, before replication. This may be more clear with `ceph df detail` Note that CephFS or RGW data pools with very small files or objects may show more USED vs STORED than expected due to padding, which will be improved with Tentacle (at least for new pools).
On Jul 24, 2025, at 7:49 AM, Szabo, Istvan (Agoda) <Istvan.Szabo@agoda.com> wrote:
Hi,
Somehow this output always made me confused. Can you confirm my calculation is good here?
I have this output:
--- RAW STORAGE --- CLASS SIZE AVAIL USED RAW USED %RAW USED nvme 89 TiB 82 TiB 6.6 TiB 6.6 TiB 7.43 rbd 31 TiB 16 TiB 16 TiB 16 TiB 49.52 ssd 2.3 PiB 1.0 PiB 1.2 PiB 1.2 PiB 54.14 TOTAL 2.4 PiB 1.1 PiB 1.2 PiB 1.2 PiB 52.36
SSD: ec 4:2 rbd: repl 3
I want to know the stored data, which means the user side data. In ceph in EC 4:2 a 100MB object is stored on 150MB.
In case of ssd, I want to know the used 1.2PiB means how much real user data? For me 1.2PiB used SSD means ~903TB user data on ec 4:2.
In case of rbd, ~6TB.
Am I correct?
Ty
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