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3,990 bytes removed, 18:02, 13 April 2015
Move Feature Flags to individual page.
== Feature Flags ==
{| class="wikitable"!Feature flag!colspan=3|FreeBSD!ZFS on Linux!OpenZFS OSX!OmniOS|-|| 8.4| 9.3| 10.1| 0.6.4| 1.3.1| r15104|-!async_destroy|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!empty_bpobj|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!lz4_compress|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!multi_vdev_crash_dump|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|no|no|style="background-color:lightgreen"|yes|-!spacemap_histogram|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!enabled_txg|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!hole_birth|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!extensible_dataset|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!embedded_data|no|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!bookmarks|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|-!filesystem_limits|no|style="background-color:lightgreen"|yes|style="background-color:lightgreen"|yes|no|no|style="background-color:lightgreen"|yes|-!large_blocks|no|no|no|no|no|style="background-color:lightgreen"|yes|} '''Table legend'''Other distributions: * no = not implemented* yes = implemented For greatest compatibility, features that are exclusive (when enabled) should be periodically ported to all other distributions. === Background === Originally See the ZFS on-disk format was versioned with a single number that was increased whenever a new on-disk format change was introduced. This worked well when a single entity controlled the development of ZFS; however, in the more distributed development model of OpenZFS a single version number is not ideal. Every OpenZFS implementation would need to agree on every change to the on-disk format. One of the first OpenZFS projects was a new versioning system called "feature flags" that tags on-disk format changes with unique names. The system supports both completely independent format changes, as well as format changes that depend on each other. A pool's on-disk format is portable between OpenZFS implementations as long as all of the feature flags in use by the pool are supported by both implementations. For more details see these [http://blog.delphix.com/csiden/files/2012/01/ZFS_Feature_Flags.pdf slides (Jan 2012)] and [http://illumos.org/man/5/zpool-features <tt>zpool-features(5)</tt>Feature_Flags|Feature Flags] (illumos) or [http://www.freebsd.org/cgi/man.cgi?query=zpool-features&sektion=7&manpath=FreeBSD+11-current <tt>zpool-features(7)</tt>] (FreeBSD)wiki page.
== libzfs_core ==
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