This update provides the ability to use data deduplication. In order to use this mode, the storage pool must be upgraded. If you choose not to upgrade the pool and attempt to use this property, you will get an error indicating that the storage pool needs to be upgraded first. There is no other implication of applying this update, and it can be ignored if there is no need to use this new setting. Applying this update is equivalent to upgrading the on-disk ZFS pool to version 21.
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