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How to Apply Deferred Updates (CLI)
Support for Multi Replace Deferred Update
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.
Support for Recursize Snapshots Deferred Update
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.
Support for Snapshot Deletion Deferred Update
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.
Support for Slim ZIL Deferred Update
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.
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Oracle ZFS Storage Appliance Customer Service Manual • February 2016
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