ZFS compression doesn't work

[antonin tessier]

> >despite I did:
> ># zfs set compression=gzip home/compressed
> 
> Did you run that command before or after you copied the data into
> /home/compressed?
> 
> How much data did you load into /home/compressed?
> 
> How did you copy the data into /home/compressed?
> 
> What is the result of "zfs get all home/compressed"?


I did it after the data was copied;
/home/compressed now contains 7.5 Gio;

"zfs get all home/compressed" tells me "NAME             PROPERTY              VALUE                  SOURCE
home/compressed  type                  filesystem             -
home/compressed  creation              Mon Aug 27 13:49 2012  -
home/compressed  used                  7.32G                  -
home/compressed  available             180G                   -
home/compressed  referenced            7.32G                  -
home/compressed  compressratio         1.05x                  -
home/compressed  mounted               yes                    -
home/compressed  quota                 none                   default
home/compressed  reservation           none                   default
home/compressed  recordsize            128K                   default
home/compressed  mountpoint            /home/compressed       default
home/compressed  sharenfs              off                    default
home/compressed  checksum              on                     default
home/compressed  compression           lzjb                   local
home/compressed  atime                 on                     default
home/compressed  devices               on                     default
home/compressed  exec                  on                     default
home/compressed  setuid                on                     default
home/compressed  readonly              off                    default
home/compressed  jailed                off                    default
home/compressed  snapdir               hidden                 default
home/compressed  aclmode               discard                default
home/compressed  aclinherit            restricted             default
home/compressed  canmount              on                     default
home/compressed  xattr                 off                    temporary
home/compressed  copies                1                      default
home/compressed  version               5                      -
home/compressed  utf8only              off                    -
home/compressed  normalization         none                   -
home/compressed  casesensitivity       sensitive              -
home/compressed  vscan                 off                    default
home/compressed  nbmand                off                    default
home/compressed  sharesmb              off                    default
home/compressed  refquota              none                   default
home/compressed  refreservation        none                   default
home/compressed  primarycache          all                    default
home/compressed  secondarycache        all                    default
home/compressed  usedbysnapshots       0                      -
home/compressed  usedbydataset         7.32G                  -
home/compressed  usedbychildren        0                      -
home/compressed  usedbyrefreservation  0                      -
home/compressed  logbias               latency                default
home/compressed  dedup                 off                    default
home/compressed  mlslabel                                     -
home/compressed  sync                  standard               default
home/compressed  refcompressratio      1.05x                  -
home/compressed  written               7.32G                  -"

Ending, if I change gzip into lzjb, will my data by compress this new way ?

Thank you.