NAME

       zpool-add — add vdevs to ZFS storage pool

SYNOPSIS

       zpool    add   [-fgLnP]   [--allow-in-use   --allow-replication-mismatch   --allow-ashift-mismatch]   [-o
             property=value] pool vdev…

DESCRIPTION

       Adds the specified virtual devices to the given pool.  The vdev specification is described in the Virtual
       Devices section of zpoolconcepts(7).  The behavior of the -f option, and the device checks performed  are
       described in the zpool create subcommand.

       -f      Forces  use  of  vdevs,  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.

       -g      Display 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.

       -L      Display  real  paths  for  vdevs  resolving  all symbolic links.  This can be used to look up the
               current block device name regardless of the /dev/disk path used to open it.

       -n      Displays the configuration that would be used without actually adding the vdevs.  The actual pool
               creation can still fail due to insufficient privileges or device sharing.

       -P      Display real paths for vdevs instead of only the last component of the path.  This can be used in
               conjunction with the -L flag.

       -o property=value
               Sets the given pool properties.  See the zpoolprops(7) manual page for a list of valid properties
               that can be set.  The only property supported at the moment is ashift.

       --allow-ashift-mismatch
               Disable the ashift validation which allows mismatched ashift values in  the  pool.   Adding  top-
               level  vdevs  with  different  sector  sizes  will prohibit future device removal operations, see
               zpool-remove(8).

       --allow-in-use
               Allow vdevs to be added even if they might be in use in another pool.

       --allow-replication-mismatch
               Allow vdevs with conflicting replication levels to be added to the pool.

EXAMPLES

   Example 1: Adding a Mirror to a ZFS Storage Pool
       The following command adds two mirrored disks to the pool tank, assuming the pool is already made  up  of
       two-way mirrors.  The additional space is immediately available to any datasets within the pool.
             # zpool add tank mirror sda sdb

   Example 2: Adding Cache Devices to a ZFS Pool
       The following command adds two disks for use as cache devices to a ZFS storage pool:
             # zpool add pool cache sdc sdd

       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 iostat subcommand as follows:
             # zpool iostat -v pool 5

SEE ALSO

       zpool-attach(8), zpool-import(8), zpool-initialize(8), zpool-online(8), zpool-remove(8)

OpenZFS                                           March 8, 2024                                     ZPOOL-ADD(8)