root@mowa219-gjp4-8570p-freebsd:~ # gdisk /dev/da3
GPT fdisk (gdisk) version 1.0.9

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries in memory.

Command (? for help): n
Partition number (1-128, default 1): 
First sector (34-15267806, default = 2048) or {+-}size{KMGTP}: 
Last sector (2048-15267806, default = 15265791) or {+-}size{KMGTP}: +3G
Current type is A503 (FreeBSD UFS)
Hex code or GUID (L to show codes, Enter = A503): a504
Changed type of partition to 'FreeBSD ZFS'

Command (? for help): n
Partition number (2-128, default 2): 
First sector (34-15267806, default = 6293504) or {+-}size{KMGTP}: 
Last sector (6293504-15267806, default = 15265791) or {+-}size{KMGTP}: 
Current type is A503 (FreeBSD UFS)
Hex code or GUID (L to show codes, Enter = A503): a504
Changed type of partition to 'FreeBSD ZFS'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/da3.
Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.
root@mowa219-gjp4-8570p-freebsd:~ # zpool create dandelion /dev/da3p1
root@mowa219-gjp4-8570p-freebsd:~ # zpool create seeds /dev/da3p2
root@mowa219-gjp4-8570p-freebsd:~ # zpool export dandelion
root@mowa219-gjp4-8570p-freebsd:~ # zpool export seeds
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3
failed to unpack label 0
failed to unpack label 1
failed to unpack label 2
failed to unpack label 3
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3p1
------------------------------------
LABEL 0 
------------------------------------
    version: 5000
    name: 'dandelion'
    state: 1
    txg: 140
    pool_guid: 7668763410677090373
    errata: 0
    hostid: 635545813
    hostname: 'mowa219-gjp4-8570p-freebsd'
    top_guid: 1327468058447962334
    guid: 1327468058447962334
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 1327468058447962334
        path: '/dev/da3p1'
        whole_disk: 1
        metaslab_array: 130
        metaslab_shift: 28
        ashift: 12
        asize: 3216506880
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
        com.klarasystems:vdev_zaps_v2
    labels = 0 1 2 3 
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3p2
------------------------------------
LABEL 0 
------------------------------------
    version: 5000
    name: 'seeds'
    state: 1
    txg: 187
    pool_guid: 10424398282100427069
    errata: 0
    hostid: 635545813
    hostname: 'mowa219-gjp4-8570p-freebsd'
    top_guid: 6957864822190159989
    guid: 6957864822190159989
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 6957864822190159989
        path: '/dev/da3p2'
        whole_disk: 1
        metaslab_array: 62
        metaslab_shift: 29
        ashift: 12
        asize: 4589092864
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
        com.klarasystems:vdev_zaps_v2
    labels = 0 1 2 3 
root@mowa219-gjp4-8570p-freebsd:~ # zpool labelclear /dev/da3
failed to clear label for /dev/da3
root@mowa219-gjp4-8570p-freebsd:~ # zpool labelclear /dev/da3p1
use '-f' to override the following error:
/dev/da3p1 is a member of exported pool "dandelion"
root@mowa219-gjp4-8570p-freebsd:~ # zpool destroy dandelion
cannot open 'dandelion': no such pool
root@mowa219-gjp4-8570p-freebsd:~ # zpool import dandelion
root@mowa219-gjp4-8570p-freebsd:~ # zfs umount dandelion
root@mowa219-gjp4-8570p-freebsd:~ # zpool destroy dandelion
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3p1
------------------------------------
LABEL 0 
------------------------------------
    version: 5000
    name: 'dandelion'
    state: 2
    txg: 162
    pool_guid: 7668763410677090373
    errata: 0
    hostid: 635545813
    hostname: 'mowa219-gjp4-8570p-freebsd'
    top_guid: 1327468058447962334
    guid: 1327468058447962334
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 1327468058447962334
        path: '/dev/da3p1'
        whole_disk: 1
        metaslab_array: 130
        metaslab_shift: 28
        ashift: 12
        asize: 3216506880
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
        com.klarasystems:vdev_zaps_v2
    labels = 0 1 2 3 
root@mowa219-gjp4-8570p-freebsd:~ # zpool labelclear /dev/da3p1
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3p1
failed to unpack label 0
failed to unpack label 1
failed to unpack label 2
failed to unpack label 3
root@mowa219-gjp4-8570p-freebsd:~ # zdb -l /dev/da3p2
------------------------------------
LABEL 0 
------------------------------------
    version: 5000
    name: 'seeds'
    state: 1
    txg: 187
    pool_guid: 10424398282100427069
    errata: 0
    hostid: 635545813
    hostname: 'mowa219-gjp4-8570p-freebsd'
    top_guid: 6957864822190159989
    guid: 6957864822190159989
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 6957864822190159989
        path: '/dev/da3p2'
        whole_disk: 1
        metaslab_array: 62
        metaslab_shift: 29
        ashift: 12
        asize: 4589092864
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
        com.klarasystems:vdev_zaps_v2
    labels = 0 1 2 3 
root@mowa219-gjp4-8570p-freebsd:~ #