ZFS compresison

zfs get compression
zfs get compression /rpool
 
zfs get compressratio 
zfs get compressratio /rpool
 
zfs get compression,compressratio,used,logicalused,referenced,logicalreferenced rpool/data/subvol-118-disk-0

From OpenZFS 2.0.0 there is support for ZSTD:

zpool get all | grep compr
nvmpool  feature@lz4_compress           active                         local
nvmpool  feature@zstd_compress          disabled                       local
rpool    feature@lz4_compress           active                         local
rpool    feature@zstd_compress          disabled                       local
 
zfs get all rpool | grep compr
rpool  compressratio         1.16x                   -
rpool  compression           on                      local
rpool  refcompressratio      1.00x                   -

zfs set compression=zstd rpool/data
cannot set property for 'rpool/data': pool and or dataset must be upgraded to set this property or value

OpenZFS ZSTD compression level is 3 (available range is 1-19). To change it to 9:

zfs set compression=zstd-9 rpool/data

NOTE: it significantly increase CPU usage when writing huge amount of data (RAW movies). The best results for RAW movies is off or lz4.