xref: /freebsd/sys/contrib/openzfs/man/man8/zpool-add.8 (revision 783d3ff6d7fae619db8a7990b8a6387de0c677b5)

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.Dd March 8, 2024
.Dt ZPOOL-ADD 8
.Os
.
.Sh NAME
.Nm zpool-add
.Nd add vdevs to ZFS storage pool
.Sh SYNOPSIS
.Nm zpool
.Cm add
.Op Fl fgLnP
.Op Fl -allow-in-use -allow-replication-mismatch -allow-ashift-mismatch
.Oo Fl o Ar property Ns = Ns Ar value Oc
.Ar pool vdev Ns …
.
.Sh DESCRIPTION
Adds the specified virtual devices to the given pool.
The
.Ar vdev
specification is described in the
.Em Virtual Devices
section of
.Xr zpoolconcepts 7 .
The behavior of the
.Fl f
option, and the device checks performed are described in the
.Nm zpool Cm create
subcommand.
.Bl -tag -width Ds
.It Fl f
Forces use of
.Ar vdev Ns s ,
even if they appear in use, have conflicting ashift values, or specify
a conflicting replication level.
Not all devices can be overridden in this manner.
.It Fl g
Display
.Ar vdev ,
GUIDs instead of the normal device names.
These GUIDs can be used in place of
device names for the zpool detach/offline/remove/replace commands.
.It Fl L
Display real paths for
.Ar vdev Ns s
resolving all symbolic links.
This can be used to look up the current block
device name regardless of the
.Pa /dev/disk
path used to open it.
.It Fl n
Displays the configuration that would be used without actually adding the
.Ar vdev Ns s .
The actual pool creation can still fail due to insufficient privileges or
device sharing.
.It Fl P
Display real paths for
.Ar vdev Ns s
instead of only the last component of the path.
This can be used in conjunction with the
.Fl L
flag.
.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 -allow-ashift-mismatch
Disable the ashift validation which allows mismatched ashift values in the
pool.
Adding top-level
.Ar vdev Ns s
with different sector sizes will prohibit future device removal operations, see
.Xr zpool-remove 8 .
.It Fl -allow-in-use
Allow vdevs to be added even if they might be in use in another pool.
.It Fl -allow-replication-mismatch
Allow vdevs with conflicting replication levels to be added to the pool.
.El
.
.Sh EXAMPLES
.\" These are, respectively, examples 5, 13 from zpool.8
.\" Make sure to update them bidirectionally
.Ss Example 1 : No Adding a Mirror to a ZFS Storage Pool
The following command adds two mirrored disks to the pool
.Ar tank ,
assuming the pool is already made up of two-way mirrors.
The additional space is immediately available to any datasets within the pool.
.Dl # Nm zpool Cm add Ar tank Sy mirror Pa sda sdb
.
.Ss Example 2 : No Adding Cache Devices to a ZFS Pool
The following command adds two disks for use as cache devices to a ZFS storage
pool:
.Dl # Nm zpool Cm add Ar pool Sy cache Pa sdc sdd
.Pp
Once added, the cache devices gradually fill with content from main memory.
Depending on the size of your cache devices, it could take over an hour for
them to fill.
Capacity and reads can be monitored using the
.Cm iostat
subcommand as follows:
.Dl # Nm zpool Cm iostat Fl v Ar pool 5
.
.Sh SEE ALSO
.Xr zpool-attach 8 ,
.Xr zpool-import 8 ,
.Xr zpool-initialize 8 ,
.Xr zpool-online 8 ,
.Xr zpool-remove 8