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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 changes the layout of ZFS intent log blocks to improve synchronous write performance. These improvements rely on a ZFS pool upgrade provided by this update. Before this update has been applied, log records continue to be written in the old format and performance may be reduced.
Applying this update is equivalent to upgrading the on-disk ZFS pool to version 23.