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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.
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.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
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.Dd August 9, 2019
.Dt ZPOOL-ATTACH 8
.Os Linux
.Sh NAME
.Nm zpool Ns Pf - Cm attach
.Nd Attach a new device to an existing ZFS virtual device (vdev).
.Sh SYNOPSIS
.Nm
.Cm attach
.Op Fl fw
.Oo Fl o Ar property Ns = Ns Ar value Oc
.Ar pool device new_device
.Sh DESCRIPTION
.Bl -tag -width Ds
.It Xo
.Nm
.Cm attach
.Op Fl fw
.Oo Fl o Ar property Ns = Ns Ar value Oc
.Ar pool device new_device
.Xc
Attaches
.Ar new_device
to the existing
.Ar device .
The existing device cannot be part of a raidz configuration.
If
.Ar device
is not currently part of a mirrored configuration,
.Ar device
automatically transforms into a two-way mirror of
.Ar device
and
.Ar new_device .
If
.Ar device
is part of a two-way mirror, attaching
.Ar new_device
creates a three-way mirror, and so on.
In either case,
.Ar new_device
begins to resilver immediately.
.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 w
Waits until
.Ar new_device
has finished resilvering before returning.
.It Fl o Ar property Ns = Ns Ar value
Sets the given pool properties. See the
.Xr zpoolprops 8
manual page for a list of valid properties that can be set. The only property
supported at the moment is ashift.
.El
.El
.Sh SEE ALSO
.Xr zpool-detach 8 ,
.Xr zpool-add 8 ,
.Xr zpool-import 8 ,
.Xr zpool-initialize 8 ,
.Xr zpool-online 8 ,
.Xr zpool-replace 8 ,
.Xr zpool-resilver 8
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