zpool-add —
add vdevs to ZFS storage pool
zpool |
add
[-fgLnP
]
[-o
property=value
]
pool vdev… |
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.
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
zpool-attach(8),
zpool-import(8),
zpool-initialize(8),
zpool-online(8),
zpool-remove(8)