NAME

zpool-prefetch — Prefetches pool metadata into ARC

SYNOPSIS

zpool

prefetch [-t type] pool

DESCRIPTION

Massively prefetch metadata of a specific type for the given pool into the ARC to reduce latency of some operations later. If no type is specified, all types are prefetched.

The following types are supported:

brt

Prefetch the BRT (block reference table). This may improve performance for block cloning operations, and frees for earlier cloned blocks.

ddt

Prefetch the DDT (deduplication table). This may improve performance of writes when deduplication is enabled, and frees for earlier deduplicated blocks.