This deferred update allows importing a pool with a missing log device and corrects the behavior of the system when a device that is being resilvered is itself removed or replaced. These fixes rely on a ZFS pool upgrade provided by this update. Before this update has been applied, the system is unable to import pools with missing log devices and does not correctly handle replacement of resilvering devices (see CR 6782540). Applying this update is equivalent to upgrading the on-disk ZFS pool to version 28.
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