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41878d57ea
Implement BRT (Block Reference Table) prefetch functionality similar to existing DDT prefetch. This allows preloading BRT metadata into ARC to improve performance for block cloning operations and frees of earlier cloned blocks. Make -t parameter optional. When omitted, prefetch all supported metadata types (both DDT and BRT now). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #17890
53 lines
1.6 KiB
Groff
53 lines
1.6 KiB
Groff
.\" SPDX-License-Identifier: CDDL-1.0
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.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or http://www.opensolaris.org/os/licensing.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\"
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.\" Copyright (c) 2023, Klara Inc.
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.\"
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.Dd February 14, 2024
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.Dt ZPOOL-PREFETCH 8
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.Os
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.
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.Sh NAME
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.Nm zpool-prefetch
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.Nd Prefetches pool metadata into ARC
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.Sh SYNOPSIS
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.Nm zpool
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.Cm prefetch
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.Op Fl t Ar type
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.Ar pool
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.Sh DESCRIPTION
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Massively prefetch metadata of a specific type for the given pool into the ARC
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to reduce latency of some operations later.
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If no type is specified, all types are prefetched.
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.Pp
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The following types are supported:
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.Bl -tag -width "brt"
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.It Sy brt
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Prefetch the BRT (block reference table).
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This may improve performance for block cloning operations,
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and frees for earlier cloned blocks.
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.It Sy ddt
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Prefetch the DDT (deduplication table).
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This may improve performance of writes when deduplication is enabled,
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and frees for earlier deduplicated blocks.
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.El
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