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.\"
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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 May 29, 2021
.Dt ZPOOL-REPLACE 8
.Os
.
.Sh NAME
.Nm zpool-replace
.Nd replace one device with another in ZFS storage pool
.Sh SYNOPSIS
.Nm zpool
.Cm replace
.Op Fl fsw
.Oo Fl o Ar property Ns = Ns Ar value Oc
.Ar pool Ar device Op Ar new-device
.
.Sh DESCRIPTION
Replaces
.Ar device
with
.Ar new-device .
This is equivalent to attaching
.Ar new-device ,
waiting for it to resilver, and then detaching
.Ar device .
Any in progress scrub will be cancelled.
.Pp
The size of
.Ar new-device
must be greater than or equal to the minimum size of all the devices in a mirror
or raidz configuration.
.Pp
.Ar new-device
is required if the pool is not redundant.
If
.Ar new-device
is not specified, it defaults to
.Ar device .
This form of replacement is useful after an existing disk has failed and has
been physically replaced.
In this case, the new disk may have the same
.Pa /dev
path as the old device, even though it is actually a different disk.
ZFS recognizes this.
.Bl -tag -width Ds
.It Fl f
Forces use of
.Ar new-device ,
even if it appears to be in use.
Not all devices can be overridden in this manner.
.It Fl o Ar property Ns = Ns Ar value
Sets the given pool properties.
See the
.Xr zpoolprops 7
manual page for a list of valid properties that can be set.
The only property supported at the moment is
.Sy ashift .
.It Fl s
The
.Ar new-device
is reconstructed sequentially to restore redundancy as quickly as possible.
Checksums are not verified during sequential reconstruction so a scrub is
started when the resilver completes.
Sequential reconstruction is not supported for raidz configurations.
.It Fl w
Waits until the replacement has completed before returning.
.El
.
.Sh SEE ALSO
.Xr zpool-detach 8 ,
.Xr zpool-initialize 8 ,
.Xr zpool-online 8 ,
.Xr zpool-resilver 8
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