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linux:fs:zfs:compression [2021/02/14 20:32] – created niziaklinux:fs:zfs:compression [2026/01/19 13:02] (current) – [switch to ZSTD] niziak
Line 7: Line 7:
 zfs get compressratio  zfs get compressratio 
 zfs get compressratio /rpool zfs get compressratio /rpool
 +
 +zfs get compression,compressratio,used,logicalused,referenced,logicalreferenced rpool/data/subvol-118-disk-0
 </code> </code>
 +
 +
 +===== switch to ZSTD =====
 +
 +From OpenZFS 2.0.0 there is support for ZSTD:
 +
 +<code bash>
 +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                   -
 +</code>
 +
 +<code bash>
 +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
 +</code>
 +
 +OpenZFS ZSTD compression level is 3 (available range is 1-19). To change it to 9:
 +<code bash>
 +zfs set compression=zstd-9 rpool/data
 +</code>
 +NOTE: it significantly increase CPU usage when writing huge amount of data (RAW movies). The best results for RAW movies is ''off'' or ''lz4''.
 +
 +
 +
 +