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zpool-remove.8 (5648B)

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.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
.\" Copyright (c) 2017 Datto Inc.
.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
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.Dd March 16, 2022
.Dt ZPOOL-REMOVE 8
.Os
.
.Sh NAME
.Nm zpool-remove
.Nd remove devices from ZFS storage pool
.
.Sh SYNOPSIS
.Nm zpool
.Cm remove
.Op Fl npw
.Ar pool Ar device Ns …
.Nm zpool
.Cm remove
.Fl s
.Ar pool
.
.Sh DESCRIPTION
.Bl -tag -width Ds
.It Xo
.Nm zpool
.Cm remove
.Op Fl npw
.Ar pool Ar device Ns …
.Xc
Removes the specified device from the pool.
This command supports removing hot spare, cache, log, and both mirrored and
non-redundant primary top-level vdevs, including dedup and special vdevs.
.Pp
Top-level vdevs can only be removed if the primary pool storage does not contain
a top-level raidz vdev, all top-level vdevs have the same sector size, and the
keys for all encrypted datasets are loaded.
.Pp
Removing a top-level vdev reduces the total amount of space in the storage pool.
The specified device will be evacuated by copying all allocated space from it to
the other devices in the pool.
In this case, the
.Nm zpool Cm remove
command initiates the removal and returns, while the evacuation continues in
the background.
The removal progress can be monitored with
.Nm zpool Cm status .
If an I/O error is encountered during the removal process it will be cancelled.
The
.Sy device_removal
feature flag must be enabled to remove a top-level vdev, see
.Xr zpool-features 7 .
.Pp
A mirrored top-level device (log or data) can be removed by specifying the top-
level mirror for the
same.
Non-log devices or data devices that are part of a mirrored configuration can be
removed using
the
.Nm zpool Cm detach
command.
.Bl -tag -width Ds
.It Fl n
Do not actually perform the removal
.Pq Qq No-op .
Instead, print the estimated amount of memory that will be used by the
mapping table after the removal completes.
This is nonzero only for top-level vdevs.
.El
.Bl -tag -width Ds
.It Fl p
Used in conjunction with the
.Fl n
flag, displays numbers as parsable (exact) values.
.It Fl w
Waits until the removal has completed before returning.
.El
.It Xo
.Nm zpool
.Cm remove
.Fl s
.Ar pool
.Xc
Stops and cancels an in-progress removal of a top-level vdev.
.El
.
.Sh EXAMPLES
.\" These are, respectively, examples 15 from zpool.8
.\" Make sure to update them bidirectionally
.Ss Example 1 : No Removing a Mirrored top-level (Log or Data) Device
The following commands remove the mirrored log device
.Sy mirror-2
and mirrored top-level data device
.Sy mirror-1 .
.Pp
Given this configuration:
.Bd -literal -compact -offset Ds
  pool: tank
 state: ONLINE
 scrub: none requested
config:
         NAME        STATE     READ WRITE CKSUM
         tank        ONLINE       0     0     0
           mirror-0  ONLINE       0     0     0
             sda     ONLINE       0     0     0
             sdb     ONLINE       0     0     0
           mirror-1  ONLINE       0     0     0
             sdc     ONLINE       0     0     0
             sdd     ONLINE       0     0     0
         logs
           mirror-2  ONLINE       0     0     0
             sde     ONLINE       0     0     0
             sdf     ONLINE       0     0     0
.Ed
.Pp
The command to remove the mirrored log
.Ar mirror-2 No is :
.Dl # Nm zpool Cm remove Ar tank mirror-2
.Pp
At this point, the log device no longer exists
(both sides of the mirror have been removed):
.Bd -literal -compact -offset Ds
  pool: tank
 state: ONLINE
  scan: none requested
config:
        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            sda     ONLINE       0     0     0
            sdb     ONLINE       0     0     0
          mirror-1  ONLINE       0     0     0
            sdc     ONLINE       0     0     0
            sdd     ONLINE       0     0     0
.Ed
.Pp
The command to remove the mirrored data
.Ar mirror-1 No is :
.Dl # Nm zpool Cm remove Ar tank mirror-1
.Pp
After
.Ar mirror-1 No has been evacuated, the pool remains redundant, but
the total amount of space is reduced:
.Bd -literal -compact -offset Ds
  pool: tank
 state: ONLINE
  scan: none requested
config:
        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            sda     ONLINE       0     0     0
            sdb     ONLINE       0     0     0
.Ed
.
.Sh SEE ALSO
.Xr zpool-add 8 ,
.Xr zpool-detach 8 ,
.Xr zpool-labelclear 8 ,
.Xr zpool-offline 8 ,
.Xr zpool-replace 8 ,
.Xr zpool-split 8