[GitHub] [cloudstack] leolleeooleo commented on issue #5500: CEPH Primary Storage capacity calculate

[GitBox <gi...@apache.org>]

leolleeooleo commented on issue #5500:
URL: https://github.com/apache/cloudstack/issues/5500#issuecomment-991469175


   Use `ceph df` that is no need to know erasure coding pools or replica.
   https://docs.ceph.com/en/latest/rados/operations/monitoring/#checking-a-cluster-s-usage-stats
   
   ~~~
   # ceph df
   --- RAW STORAGE ---
   CLASS  SIZE    AVAIL   USED     RAW USED  %RAW USED
   hdd    29 TiB  21 TiB  8.2 TiB   8.2 TiB      28.21
   TOTAL  29 TiB  21 TiB  8.2 TiB   8.2 TiB      28.21
    
   --- POOLS ---
   POOL                   ID  PGS  STORED   OBJECTS  USED     %USED  MAX AVAIL
   device_health_metrics   1    1      0 B        0      0 B      0    5.8 TiB
   cloudstack              2  256  2.7 TiB  724.29k  8.2 TiB  31.88    5.8 TiB
   ~~~
   
   In the POOLS section are not inclusive of the number of replicas, snapshots or clones.
   
   STORED : actual amount of data has stored.
   MAX AVAIL : estimated amount of data that can be written.
   
   ~~~
   Used = STORED
   Actual Total = STORED + MAX AVAIL
   
   Allocated: Disk Allocated
   Total = (STORED + MAX AVAIL) * Overprovisioning Factor
   ~~~


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