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Published by behlendorf over 9 years ago
spacemap_histogram
This features allows ZFS to maintain more information about how free space is organized within the pool. If this feature is enabled, ZFS will set this feature to active when a new space map object is created or an existing space map is upgraded to the new format.
extensible_dataset
This feature allows more flexible use of internal ZFS data structures, and exists for other features to depend on. This feature will be active when the first dependent feature uses it.
bookmarks
This feature enables use of the zfs bookmark subcommand. Bookmarks mark the point in time when a snapshot was created, they can be used as the incremental source for a zfs send command. All bookmarks in the pool can be listed by running zfs list -t bookmark -r poolname.
enabled_txg
Once this feature is enabled ZFS records the transaction group number in which new features are enabled. This has no user-visible impact, but other features may depend on this feature.
hole_birth
This feature improves performance of incremental sends ("zfs send -i") and receives for objects with many holes. The most common case of hole-filled objects is zvols.
embedded_data
This feature improves the performance and compression ratio of highly-compressible blocks. Blocks whose contents can compress to 112 bytes or smaller can take advantage of this feature.