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7987d4deb4
Make a minor update to the 'zpool remove' man page to clarify both raidz and draid pools do not support removal, and change sector to ashift which is what we actually care about. Update the big theory comment in vdev_removal.c to accurately reflect which types of vdevs can be removed. Furthermore, I've added some discussion for the casual reader to briefly explain the top-level vdev removal restrictions. This has been a common area of confusion and it's not intuitive where they come from without understanding the implementation details. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #17847
191 lines
5.6 KiB
Groff
191 lines
5.6 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 https://opensource.org/licenses/CDDL-1.0.
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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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.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
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.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
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.\" Copyright (c) 2017 Datto Inc.
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.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
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.\" Copyright 2017 Nexenta Systems, Inc.
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.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
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.\"
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.Dd November 19, 2024
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.Dt ZPOOL-REMOVE 8
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.Os
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.
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.Sh NAME
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.Nm zpool-remove
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.Nd remove devices from ZFS storage pool
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.
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.Sh SYNOPSIS
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.Nm zpool
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.Cm remove
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.Op Fl npw
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.Ar pool Ar device Ns …
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.Nm zpool
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.Cm remove
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.Fl s
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.Ar pool
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.
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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 remove
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.Op Fl npw
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.Ar pool Ar device Ns …
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.Xc
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Removes the specified device from the pool.
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This command supports removing hot spare, cache, log, and both mirrored and
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non-redundant primary top-level vdevs, including dedup and special vdevs.
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.Pp
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Top-level vdevs can only be removed if the primary pool storage does not contain
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a top-level raidz or draid vdev, all top-level vdevs have the same ashift size,
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and the keys for all encrypted datasets are loaded.
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.Pp
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Removing a top-level vdev reduces the total amount of space in the storage pool.
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The specified device will be evacuated by copying all allocated space from it to
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the other devices in the pool.
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In this case, the
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.Nm zpool Cm remove
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command initiates the removal and returns, while the evacuation continues in
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the background.
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The removal progress can be monitored with
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.Nm zpool Cm status .
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If an I/O error is encountered during the removal process it will be canceled.
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The
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.Sy device_removal
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feature flag must be enabled to remove a top-level vdev, see
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.Xr zpool-features 7 .
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.Pp
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A mirrored top-level device (log or data) can be removed by specifying the top-
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level mirror for the
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same.
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Non-log devices or data devices that are part of a mirrored configuration can be
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removed using
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the
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.Nm zpool Cm detach
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command.
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.Bl -tag -width Ds
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.It Fl n
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Do not actually perform the removal
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.Pq Qq No-op .
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Instead, print the estimated amount of memory that will be used by the
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mapping table after the removal completes.
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This is nonzero only for top-level vdevs.
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.El
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.Bl -tag -width Ds
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.It Fl p
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Used in conjunction with the
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.Fl n
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flag, displays numbers as parsable (exact) values.
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.It Fl w
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Waits until the removal has completed before returning.
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.El
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.It Xo
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.Nm zpool
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.Cm remove
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.Fl s
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.Ar pool
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.Xc
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Stops and cancels an in-progress removal of a top-level vdev.
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.El
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.
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.Sh EXAMPLES
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.\" These are, respectively, examples 15 from zpool.8
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.\" Make sure to update them bidirectionally
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.Ss Example 1 : No Removing a Mirrored top-level (Log or Data) Device
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The following commands remove the mirrored log device
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.Sy mirror-2
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and mirrored top-level data device
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.Sy mirror-1 .
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.Pp
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Given this configuration:
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.Bd -literal -compact -offset Ds
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pool: tank
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state: ONLINE
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scrub: none requested
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config:
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NAME STATE READ WRITE CKSUM
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tank ONLINE 0 0 0
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mirror-0 ONLINE 0 0 0
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sda ONLINE 0 0 0
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sdb ONLINE 0 0 0
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mirror-1 ONLINE 0 0 0
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sdc ONLINE 0 0 0
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sdd ONLINE 0 0 0
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logs
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mirror-2 ONLINE 0 0 0
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sde ONLINE 0 0 0
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sdf ONLINE 0 0 0
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.Ed
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.Pp
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The command to remove the mirrored log
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.Ar mirror-2 No is :
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.Dl # Nm zpool Cm remove Ar tank mirror-2
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.Pp
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At this point, the log device no longer exists
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(both sides of the mirror have been removed):
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.Bd -literal -compact -offset Ds
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pool: tank
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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tank ONLINE 0 0 0
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mirror-0 ONLINE 0 0 0
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sda ONLINE 0 0 0
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sdb ONLINE 0 0 0
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mirror-1 ONLINE 0 0 0
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sdc ONLINE 0 0 0
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sdd ONLINE 0 0 0
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.Ed
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.Pp
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The command to remove the mirrored data
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.Ar mirror-1 No is :
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.Dl # Nm zpool Cm remove Ar tank mirror-1
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.Pp
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After
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.Ar mirror-1 No has been evacuated, the pool remains redundant, but
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the total amount of space is reduced:
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.Bd -literal -compact -offset Ds
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pool: tank
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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tank ONLINE 0 0 0
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mirror-0 ONLINE 0 0 0
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sda ONLINE 0 0 0
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sdb ONLINE 0 0 0
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.Ed
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.
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.Sh SEE ALSO
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.Xr zpool-add 8 ,
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.Xr zpool-detach 8 ,
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.Xr zpool-labelclear 8 ,
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.Xr zpool-offline 8 ,
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.Xr zpool-replace 8 ,
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.Xr zpool-split 8
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