I'm confused.  I have compression enabled on a ZFS filesystem, which
contains for all intents and purposes, just a single 20G file, and I see ...

 

# ls -lh somefile

-rw-------   1 root     root         20G Aug 13 17:41 somefile

 

# du -h somefile

 5.6G   somefile

 

(Sounds like approx 25-30% of the original size to me...)

 

# zfs get compressratio mypool/myzfs

NAME                    PROPERTY       VALUE  SOURCE

mypool/myzfs  compressratio  1.28x  -

 

# zfs list | grep myzfs

mypool/myzfs                                          5.65G  3.80T  5.65G
/mypool/myzfs

 

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