[ceph-users] Pool Max Avail and Ceph Dashboard Pool Useage on Nautilus giving different percentages

David Majchrzak, ODERLAND Webbhotell AB david at oderland.se
Tue Dec 10 05:31:05 PST 2019


Hi!

While browsing /#/pool in nautilus ceph dashboard I noticed it said 93%
used on the single pool we have (3x replica).

ceph df detal however shows 81% used on the pool and 67% raw useage.

# ceph df detail
RAW STORAGE:
    CLASS     SIZE        AVAIL       USED        RAW USED     %RAW
USED 
    ssd       478 TiB     153 TiB     324 TiB      325
TiB         67.96 
    TOTAL     478 TiB     153 TiB     324 TiB      325
TiB         67.96 
 
POOLS:
    POOL            ID     STORED      OBJECTS     USED        %USED   
  MAX AVAIL     QUOTA OBJECTS     QUOTA BYTES     DIRTY      USED
COMPR     UNDER COMPR 
    echo      3     108 TiB      29.49M     324 TiB     81.61        24
TiB     N/A               N/A             29.49M            0
B             0 B


I know we're looking at the most full OSD (210PGs, 79% used, 1.17 VAR)
and count max avail from that. But where's the 93% full from in
dashboard?

My guess is that is comes from calculating: 

1 - Max Avail / (Used + Max avail) = 0.93


Kind Regards,

David Majchrzak



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