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How to Apply Deferred Updates (CLI)
Support for Sequential Resilvering Deferred Update
The previous resilvering algorithm repairs blocks from oldest to newest, which can degrade into
a lot of small random I/O. The new resilvering algorithm uses a two-step process to sort and
resilver blocks in LBA order.
The amount of improvement depends on how pool data is laid out. For example, sequentially
written data on a mirrored pool shows no improvement, but randomly written data or
sequentially written data on RAID-Z improves significantly - typically reducing time by 25 to
50 percent.
Support for Large Block Sizes Deferred Update
This feature provides improved performance when blocksize/recordsize larger than 128K are
used. The supported block sizes are: 256k, 512k, and 1M. If large block sizes are used for
projects or shares, replication of those projects or shares to systems that do not support large
block sizes fail.
Support for Multiple Initiator Groups per LUN Deferred Update
This deferred update allows a LUN to be associated with more than one initiator group at a
time. If replicating LUNs with this update applied, also apply the update to the replication target
system(s).
Support for Optional Child Dir Deferred Update
This deferred update improves list retrieval performance and replication deletion performance
by improving dataset rename speed. These improvements rely on a ZFS pool upgrade provided
by this update. Before this update has been applied, the system is able to retrieve lists and delete
replications, but does so using the old, much slower, recursive rename code. Applying this
update is equivalent to upgrading the on-disk ZFS pool to version 31.
Support for RAIDZ Mirror Deferred Update
This deferred update improves both latency and throughput on several important workloads.
These improvements rely on a ZFS pool upgrade provided by this update. Applying this update
is equivalent to upgrading the on-disk ZFS pool to version 29.
Maintaining the System
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