Manual Page Search Parameters
ZPOOL-PREFETCH(8) System Manager's Manual ZPOOL-PREFETCH(8)

zpool-prefetch — Loads specific types of data for the given pool

zpool prefetch -t type pool

zpool prefetch -t ddt pool
Prefetch data of a specific type for the given pool; specifically the DDT, which will improve write I/O performance when the DDT is resident in the ARC.
February 14, 2024 OpenZFS