NAME

       zpool-add — add vdevs to ZFS storage pool

SYNOPSIS

       zpool add [-fgLnP] [-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 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.

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 16, 2022                                     ZPOOL-ADD(8)