The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man8/zpool-add.8

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    1 .\" CDDL HEADER START
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    3 .\" The contents of this file are subject to the terms of the
    4 .\" Common Development and Distribution License (the "License").
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   10 .\" and limitations under the License.
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   20 .\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
   21 .\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
   22 .\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
   23 .\" Copyright (c) 2017 Datto Inc.
   24 .\" Copyright (c) 2018 George Melikov. All Rights Reserved.
   25 .\" Copyright 2017 Nexenta Systems, Inc.
   26 .\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
   27 .\"
   28 .Dd March 16, 2022
   29 .Dt ZPOOL-ADD 8
   30 .Os
   31 .
   32 .Sh NAME
   33 .Nm zpool-add
   34 .Nd add vdevs to ZFS storage pool
   35 .Sh SYNOPSIS
   36 .Nm zpool
   37 .Cm add
   38 .Op Fl fgLnP
   39 .Oo Fl o Ar property Ns = Ns Ar value Oc
   40 .Ar pool vdev Ns …
   41 .
   42 .Sh DESCRIPTION
   43 Adds the specified virtual devices to the given pool.
   44 The
   45 .Ar vdev
   46 specification is described in the
   47 .Em Virtual Devices
   48 section of
   49 .Xr zpoolconcepts 7 .
   50 The behavior of the
   51 .Fl f
   52 option, and the device checks performed are described in the
   53 .Nm zpool Cm create
   54 subcommand.
   55 .Bl -tag -width Ds
   56 .It Fl f
   57 Forces use of
   58 .Ar vdev Ns s ,
   59 even if they appear in use or specify a conflicting replication level.
   60 Not all devices can be overridden in this manner.
   61 .It Fl g
   62 Display
   63 .Ar vdev ,
   64 GUIDs instead of the normal device names.
   65 These GUIDs can be used in place of
   66 device names for the zpool detach/offline/remove/replace commands.
   67 .It Fl L
   68 Display real paths for
   69 .Ar vdev Ns s
   70 resolving all symbolic links.
   71 This can be used to look up the current block
   72 device name regardless of the
   73 .Pa /dev/disk
   74 path used to open it.
   75 .It Fl n
   76 Displays the configuration that would be used without actually adding the
   77 .Ar vdev Ns s .
   78 The actual pool creation can still fail due to insufficient privileges or
   79 device sharing.
   80 .It Fl P
   81 Display real paths for
   82 .Ar vdev Ns s
   83 instead of only the last component of the path.
   84 This can be used in conjunction with the
   85 .Fl L
   86 flag.
   87 .It Fl o Ar property Ns = Ns Ar value
   88 Sets the given pool properties.
   89 See the
   90 .Xr zpoolprops 7
   91 manual page for a list of valid properties that can be set.
   92 The only property supported at the moment is
   93 .Sy ashift .
   94 .El
   95 .
   96 .Sh EXAMPLES
   97 .\" These are, respectively, examples 5, 13 from zpool.8
   98 .\" Make sure to update them bidirectionally
   99 .Ss Example 1 : No Adding a Mirror to a ZFS Storage Pool
  100 The following command adds two mirrored disks to the pool
  101 .Ar tank ,
  102 assuming the pool is already made up of two-way mirrors.
  103 The additional space is immediately available to any datasets within the pool.
  104 .Dl # Nm zpool Cm add Ar tank Sy mirror Pa sda sdb
  105 .
  106 .Ss Example 2 : No Adding Cache Devices to a ZFS Pool
  107 The following command adds two disks for use as cache devices to a ZFS storage
  108 pool:
  109 .Dl # Nm zpool Cm add Ar pool Sy cache Pa sdc sdd
  110 .Pp
  111 Once added, the cache devices gradually fill with content from main memory.
  112 Depending on the size of your cache devices, it could take over an hour for
  113 them to fill.
  114 Capacity and reads can be monitored using the
  115 .Cm iostat
  116 subcommand as follows:
  117 .Dl # Nm zpool Cm iostat Fl v Ar pool 5
  118 .
  119 .Sh SEE ALSO
  120 .Xr zpool-attach 8 ,
  121 .Xr zpool-import 8 ,
  122 .Xr zpool-initialize 8 ,
  123 .Xr zpool-online 8 ,
  124 .Xr zpool-remove 8

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