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Quoting from the open-zfs.org wiki,
 
Quoting from the open-zfs.org wiki,
<blockquote>One of the first OpenZFS projects was a new versioning system called "feature flags" which 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.</blockquote>
 
  
<blockquote>All OpenZFS implementations now support feature flags and regularly port features between them to remain compatible.</blockquote>
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One of the first OpenZFS projects was a new versioning system called "feature flags" which 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.
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All OpenZFS implementations now support feature flags and regularly port features between them to remain compatible.
  
 
Upgrading a pool's feature flags is a one way process. If you enable new feature flags on your pools, you cannot use them with any previous version of OpenZFS on OS X unless that version also supports all of the flags you have enabled. In general, you can only use a given pool with a particular OpenZFS distribution (including those on other platforms) if that distribution supports all of the feature flags enabled in the pool.
 
Upgrading a pool's feature flags is a one way process. If you enable new feature flags on your pools, you cannot use them with any previous version of OpenZFS on OS X unless that version also supports all of the flags you have enabled. In general, you can only use a given pool with a particular OpenZFS distribution (including those on other platforms) if that distribution supports all of the feature flags enabled in the pool.

Please note that all contributions to OpenZFS on OS X may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see OpenZFS on OS X:Copyrights for details). Do not submit copyrighted work without permission!

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