ZPOOL-ADD(8)            FreeBSD System Manager's Manual           ZPOOL-ADD(8)

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)

FreeBSD 15.1-STABLE-HBSD         March 8, 2024                    ZPOOL-ADD(8)