Hello,

I'm just trying to understand these numbers:


file size is 232G, it's actual size on the lz4-compressed dataset is 18G, so then why is the compressratio only 1.86x ? And why logicalused is 34.2G ? On one hand, 34.2G exactlyfits to the 1.86x compresstaio, but still I don't get it. dataset is on raidz, 3 spans across 5 disk vdevs, with total of 15 disks if it matters:


# du -h
 18G    .
# ls -lh
total 19316318
-rw-r-----  1 root  wheel   232G  4 апр.  11:29 mp_userCoordsHistory.ibd
# zfs get all data/test
NAME       PROPERTY              VALUE SOURCE
data/test  type                  filesystem                  -
data/test  creation              ср апр.  4 10:31 2018  -
data/test  used                  18,4G                       -
data/test  available             9,95T                       -
data/test  referenced            18,4G                       -
data/test  compressratio         1.86x                       -
data/test  mounted               yes                         -
data/test  quota                 none default
data/test  reservation           none default
data/test  recordsize            128K default
data/test  mountpoint            /data/test default
data/test  sharenfs              off default
data/test  checksum              on default
data/test  compression           lz4                         local
data/test  atime                 on default
data/test  devices               on default
data/test  exec                  on default
data/test  setuid                on default
data/test  readonly              off default
data/test  jailed                off default
data/test  snapdir               hidden default
data/test  aclmode               discard default
data/test  aclinherit            restricted default
data/test  canmount              on default
data/test  xattr                 off temporary
data/test  copies                1 default
data/test  version               5                           -
data/test  utf8only              off                         -
data/test  normalization         none                        -
data/test  casesensitivity       sensitive                   -
data/test  vscan                 off default
data/test  nbmand                off default
data/test  sharesmb              off default
data/test  refquota              none default
data/test  refreservation        none default
data/test  primarycache          all default
data/test  secondarycache        all default
data/test  usedbysnapshots       0                           -
data/test  usedbydataset         18,4G                       -
data/test  usedbychildren        0                           -
data/test  usedbyrefreservation  0                           -
data/test  logbias               latency default
data/test  dedup                 on inherited from data
data/test  mlslabel                                          -
data/test  sync                  standard default
data/test  refcompressratio      1.86x                       -
data/test  written               18,4G                       -
data/test  logicalused           34,2G                       -
data/test  logicalreferenced     34,2G                       -
data/test  volmode               default default
data/test  filesystem_limit      none default
data/test  snapshot_limit        none default
data/test  filesystem_count      none default
data/test  snapshot_count        none default
data/test  redundant_metadata    all default

# zpool status
  pool: data
 state: ONLINE
scan: scrub repaired 0 in 28h24m with 0 errors on Thu Feb 15 13:26:36 2018
config:

        NAME        STATE     READ WRITE CKSUM
        data        ONLINE       0     0     0
          raidz1-0  ONLINE       0     0     0
            da2     ONLINE       0     0     0
            da3     ONLINE       0     0     0
            da4     ONLINE       0     0     0
            da5     ONLINE       0     0     0
            da6     ONLINE       0     0     0
          raidz1-1  ONLINE       0     0     0
            da7     ONLINE       0     0     0
            da8     ONLINE       0     0     0
            da9     ONLINE       0     0     0
            da10    ONLINE       0     0     0
            da11    ONLINE       0     0     0
          raidz1-2  ONLINE       0     0     0
            da12    ONLINE       0     0     0
            da13    ONLINE       0     0     0
            da14    ONLINE       0     0     0
            da15    ONLINE       0     0     0
            da16    ONLINE       0     0     0

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