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Oracle® ZFS Storage Appliance Customer Service Manual
For ZS3-x, 7x20 Controllers, and DE2-24, Sun Disk Shelves
This deferred update allows recursive snapshots to be taken without suspending the ZFS intent log, which greatly improves snapshot creation performance especially on heavily loaded controllers. These improvements rely on a ZFS pool upgrade provided by this update. Before this update has been applied, the system is able to create snapshots, but does so using the old, much slower, algorithm.
Applying this update is equivalent to upgrading the on-disk ZFS pool to version 27.