Snapshot Deletion Deferred Update; Recursive Snapshots Deferred Update; Multi Replace Deferred Update - Oracle ZFS Storage Appliance Service Manual

Related Topics
Applying Deferred Updates BUI,
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"Understanding Deferred Updates" on page 352
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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. 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
to version 26.
Related Topics
Applying Deferred Updates BUI,
■
"Understanding Deferred Updates" on page 352
■

Recursive 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. 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.
Related Topics
Applying Deferred Updates BUI,
■
"Understanding Deferred Updates" on page 352
■

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
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Snapshot Deletion Deferred Update
Deferred Updates 349