功能标志

ZFS 的磁盘格式最初是通过单一数字进行版本控制的，每当格式发生变化时，该数字就会增加。当 ZFS 的开发由单一组织推动时，这种编号方法是合适的。

对于 OpenZFS 的分布式开发，版本编号不再适用。任何对编号的更改都需要在所有实现之间达成一致，以确保每次对磁盘格式的更改都能被接受。

OpenZFS 功能标志——传统版本编号的替代方案——允许**为每次磁盘格式的更改分配一个唯一的池属性名称**。这种方法支持：

• 独立的格式更改

• 相互依赖的格式更改

兼容性

如果一个池使用的所有*功能*都被多个 OpenZFS 实现支持，那么该磁盘格式在这些实现之间是可移植的。

启用时具有排他性的功能应定期移植到所有发行版中。

参考资料

ZFS 功能标志 （Christopher Siden，2012-01，存档于互联网档案馆 Wayback Machine），特别是：“……池版本 1-28 的旧版版本号仍然存在……”。

zpool-features(7) 手册页 - OpenZFS

zpool-features (5) – illumos

各操作系统的功能标志实现

Feature Flag	Read-Only Compatible	OpenZFS (Linux, FreeBSD 13+)							FreeBSD pre OpenZFS		Illumos	Joyent	NetBSD		Nexenta		OmniOS CE			OpenZFS on OS X
		0.6.5.11	0.7.13	0.8.6	2.0.7	2.1.16	2.2.7	master	12.1.0	12.2.0	master	master	10.1	9.4	4.0.5-FP	master	r151050	r151052	master	2.2.0	2.2.2	2.2.3	main
org.zfsonlinux:allocation_classes	yes	no	no	yes	yes	yes	yes	yes	no	yes	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.delphix:async_destroy	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
org.openzfs:blake3	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.fudosecurity:block_cloning	yes	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.datto:bookmark_v2	no	no	no	yes	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.delphix:bookmark_written	no	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:bookmarks	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.nexenta:class_of_storage	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no
org.openzfs:device_rebuild	yes	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:device_removal	no	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	no	no	yes	yes	yes	yes	yes	yes	yes	yes
org.openzfs:draid	no	no	no	no	no	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
org.illumos:edonr	no	yes1	yes1	yes1	yes1	yes1	yes1	yes	no	no	yes	yes	no	no	no	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:embedded_data	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:empty_bpobj	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:enabled_txg	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.datto:encryption	no	no	no	yes	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.delphix:extensible_dataset	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.klarasystems:fast_dedup	yes	no	no	no	no	no	no	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	no	yes
com.joyent:filesystem_limits	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:head_errlog	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:hole_birth	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
org.open-zfs:large_blocks	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	yes	yes	yes	yes	yes	yes	yes	yes
org.zfsonlinux:large_dnode	no	no	yes	yes	yes	yes	yes	yes	no	yes	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.klarasystems:large_microzap	yes	no	no	no	no	no	no	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	no	yes
com.delphix:livelist	yes	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:log_spacemap	yes	no	no	no	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
org.zfsonlinux:longname	no	no	no	no	no	no	no	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	no	yes
org.illumos:lz4_compress	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.nexenta:meta_devices	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no
com.joyent:multi_vdev_crash_dump	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:obsolete_counts	yes	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	no	no	yes	yes	yes	yes	yes	yes	yes	yes
org.zfsonlinux:project_quota	yes	no	no	yes	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
org.openzfs:raidz_expansion	no	no	no	no	no	no	no	yes	no	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes
com.delphix:redacted_datasets	no	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:redaction_bookmarks	no	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.delphix:redaction_list_spill	no	no	no	no	no	no	no	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.datto:resilver_defer	yes	no	no	yes	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
org.illumos:sha512	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	yes	yes	yes	yes	yes	yes	yes	yes
org.illumos:skein	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:spacemap_histogram	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
com.delphix:spacemap_v2	yes	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
org.zfsonlinux:userobj_accounting	yes	no	yes	yes	yes	yes	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.nexenta:vdev_properties	yes	no	no	no	no	no	no	no	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no
com.klarasystems:vdev_zaps_v2	no	no	no	no	no	no	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes
com.nexenta:wbc	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	yes	no	no	no	no	no	no	no
org.openzfs:zilsaxattr	yes	no	no	no	no	no	yes	yes	no	no	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
com.delphix:zpool_checkpoint	yes	no	no	yes	yes	yes	yes	yes	yes	yes	yes	yes	no	no	no	no	yes	yes	yes	yes	yes	yes	yes
org.freebsd:zstd_compress	no	no	no	no	yes	yes	yes	yes	no	no	no	no	no	no	no	no	no	no	no	yes	yes	yes	yes

Notes:

1. Edonr support was not enabled in FreeBSD with OpenZFS up to 2.1 release included

Table generates by parsing manpages for feature flags, and is entirely dependent on good, accurate documentation.
Last updated on 2025-01-12T11:54:24.577430Z using compatibility_matrix.py.