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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 increases snapshot deletion parallelism and reduces the size of transaction groups associated with snapshot deletion to improve systemic responsiveness. These improvements rely on a ZFS pool upgrade provided by this update. Before this update has been applied, new snapshot data is stored in the old format and deleted using the old algorithm. Note that any snapshots created before this update is applied are also deleted using the old algorithm.
Applying this update is equivalent to upgrading the on-disk ZFS pool version 26.