zdb -l /dev/nda0p4
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LABEL 0 
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    version: 5000
    name: 'zroot'
    state: 0
    txg: 12166466
    pool_guid: 11097385620984263003
    errata: 0
    hostname: 'zinken'
    top_guid: 7078454651594753059
    guid: 7078454651594753059
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 7078454651594753059
        path: '/dev/gpt/zfs0'
        whole_disk: 1
        metaslab_array: 256
        metaslab_shift: 32
        ashift: 12
        asize: 497681956864
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
    labels = 0 1 2 3