1.\" CDDL HEADER START 2.\" 3.\" The contents of this file are subject to the terms of the 4.\" Common Development and Distribution License (the "License"). 5.\" You may not use this file except in compliance with the License. 6.\" 7.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 8.\" or http://www.opensolaris.org/os/licensing. 9.\" See the License for the specific language governing permissions 10.\" and limitations under the License. 11.\" 12.\" When distributing Covered Code, include this CDDL HEADER in each 13.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE. 14.\" If applicable, add the following below this CDDL HEADER, with the 15.\" fields enclosed by brackets "[]" replaced with your own identifying 16.\" information: Portions Copyright [yyyy] [name of copyright owner] 17.\" 18.\" CDDL HEADER END 19.\" 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 43Adds the specified virtual devices to the given pool. 44The 45.Ar vdev 46specification is described in the 47.Em Virtual Devices 48section of 49.Xr zpoolconcepts 7 . 50The behavior of the 51.Fl f 52option, and the device checks performed are described in the 53.Nm zpool Cm create 54subcommand. 55.Bl -tag -width Ds 56.It Fl f 57Forces use of 58.Ar vdev Ns s , 59even if they appear in use or specify a conflicting replication level. 60Not all devices can be overridden in this manner. 61.It Fl g 62Display 63.Ar vdev , 64GUIDs instead of the normal device names. 65These GUIDs can be used in place of 66device names for the zpool detach/offline/remove/replace commands. 67.It Fl L 68Display real paths for 69.Ar vdev Ns s 70resolving all symbolic links. 71This can be used to look up the current block 72device name regardless of the 73.Pa /dev/disk 74path used to open it. 75.It Fl n 76Displays the configuration that would be used without actually adding the 77.Ar vdev Ns s . 78The actual pool creation can still fail due to insufficient privileges or 79device sharing. 80.It Fl P 81Display real paths for 82.Ar vdev Ns s 83instead of only the last component of the path. 84This can be used in conjunction with the 85.Fl L 86flag. 87.It Fl o Ar property Ns = Ns Ar value 88Sets the given pool properties. 89See the 90.Xr zpoolprops 7 91manual page for a list of valid properties that can be set. 92The 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 100The following command adds two mirrored disks to the pool 101.Ar tank , 102assuming the pool is already made up of two-way mirrors. 103The 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 107The following command adds two disks for use as cache devices to a ZFS storage 108pool: 109.Dl # Nm zpool Cm add Ar pool Sy cache Pa sdc sdd 110.Pp 111Once added, the cache devices gradually fill with content from main memory. 112Depending on the size of your cache devices, it could take over an hour for 113them to fill. 114Capacity and reads can be monitored using the 115.Cm iostat 116subcommand 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 8 125