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62e7d3c89e
This change adds a new `zpool prefetch -t ddt $pool` command which causes a pool's DDT to be loaded into the ARC. The primary goal is to remove the need to "warm" a pool's cache before deduplication stops slowing write performance. It may also provide a way to reload portions of a DDT if they have been flushed due to inactivity. Sponsored-by: iXsystems, Inc. Sponsored-by: Catalogics, Inc. Sponsored-by: Klara, Inc. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Allan Jude <allan@klarasystems.com> Signed-off-by: Will Andrews <will.andrews@klarasystems.com> Signed-off-by: Fred Weigel <fred.weigel@klarasystems.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Signed-off-by: Don Brady <don.brady@klarasystems.com> Co-authored-by: Will Andrews <will.andrews@klarasystems.com> Co-authored-by: Don Brady <don.brady@klarasystems.com> Closes #15890
47 lines
1.3 KiB
Groff
47 lines
1.3 KiB
Groff
.\"
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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 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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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\" CDDL HEADER END
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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 Loads specific types of data for the given pool
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.Sh SYNOPSIS
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.Nm zpool
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.Cm prefetch
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.Fl t Ar type
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.Ar pool
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.Sh DESCRIPTION
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.Bl -tag -width Ds
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.It Xo
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.Nm zpool
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.Cm prefetch
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.Fl t Li ddt
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.Ar pool
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.Xc
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Prefetch data of a specific type for the given pool; specifically the DDT,
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which will improve write I/O performance when the DDT is resident in the ARC.
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.El
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