====== zpool features ======

[[https://openzfs.github.io/openzfs-docs/man/master/7/zpool-features.7.html|zpool-features.7]]

  * blake3 - This feature enables the use of the BLAKE3 hash algorithm for checksum and dedup
  * block_cloning - Block cloning allows to create multiple references to a single block. To use ''cp --reflink'' and other commands needing bclone support.
  * block_cloning_endian - This feature corrects ZAP entry endianness issues in the Block Reference Table (BRT) used by block cloning
  * dynamic_gang_header(*) - enables larger gang headers based on the sector size of the pool.
  * head_errlog - This feature enables the upgraded version of errlog, which required an on-disk error log format change.
  * physical_rewrite - This feature enables physical block rewriting that preserves logical birth times, avoiding unnecessary inclusion of rewritten blocks in incremental zfs send streams. Purpose: It is used to refresh data, potentially mitigating drive surface degradation (like oxidation) on older drives.
  * vdev_zaps_v2 - This feature creates a ZAP object for the root vdev.
  * zilsaxattr - This feature enables xattr=sa extended attribute logging in the ZIL