Disk space economy

[Janos Dohanics]

On Wed, 23 Jul 2014 14:40:44 -0700
Dennis Glatting <freebsd at penx.com> wrote:

> On Wed, 2014-07-23 at 17:29 -0400, Janos Dohanics wrote:
> > Hello List,
> > 
> > I have a directory which contains 48 files. 35 of these files are
> > large, close to 2 GB (reported by ls -l). 7 of the files a smaller
> > than 4 K, the rest of the files are few dozen Ks in size.
> > 
> > This is a FreeBSD 10 system with ZFS and RAIDZ2.
> > 
> > du -h reports the directory to be 208G.
> > 
> > du -A -h reports the directory to be 69G.
> > 
> > It seems there is 2G wasted for each 1G stored data - would you
> > explain why and what can I do make more economical use of disk
> > space?
> > 
> 
> Compression and/or dedup enabled?


The answer is no and no:

# zfs get all data
NAME  PROPERTY              VALUE                  SOURCE
data  type                  filesystem             -
data  creation              Sat Jul  5 16:06 2014  -
data  used                  237G                   -
data  available             4.57T                  -
data  referenced            237G                   -
data  compressratio         1.00x                  -
data  mounted               yes                    -
data  quota                 none                   default
data  reservation           none                   default
data  recordsize            128K                   default
data  mountpoint            /data                  default
data  sharenfs              off                    default
data  checksum              on                     default
data  compression           off                    default
data  atime                 on                     default
data  devices               on                     default
data  exec                  on                     default
data  setuid                on                     default
data  readonly              off                    default
data  jailed                off                    default
data  snapdir               hidden                 default
data  aclmode               discard                default
data  aclinherit            restricted             default
data  canmount              on                     default
data  xattr                 off                    temporary
data  copies                3                      local
data  version               5                      -
data  utf8only              off                    -
data  normalization         none                   -
data  casesensitivity       sensitive              -
data  vscan                 off                    default
data  nbmand                off                    default
data  sharesmb              off                    default
data  refquota              none                   default
data  refreservation        none                   default
data  primarycache          all                    default
data  secondarycache        all                    default
data  usedbysnapshots       0                      -
data  usedbydataset         237G                   -
data  usedbychildren        1.48M                  -
data  usedbyrefreservation  0                      -
data  logbias               latency                default
data  dedup                 off                    default
data  mlslabel                                     -
data  sync                  standard               default
data  refcompressratio      1.00x                  -
data  written               237G                   -
data  logicalused           79.1G                  -
data  logicalreferenced     79.1G                  -
data  volmode               default                default
data  filesystem_limit      none                   default
data  snapshot_limit        none                   default
data  filesystem_count      none                   default
data  snapshot_count        none                   default

-- 
Janos Dohanics