mismatch between zfs and zpool

[Daniel Mayfield]

Any idea why these mismatch?  These are WD20EARS disks in a USB JBOD enclosure.

[dan at rooter ~] $ zfs list
NAME                           USED  AVAIL  REFER  MOUNTPOINT
mediavg                       1.86T  3.33T   314K  /media
[dan at rooter ~] $ zpool list
NAME            SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
mediavg        7.25T  2.56T  4.69T    35%  1.00x  ONLINE  -
[dan at rooter ~/Documents/Books]$ zdb
mediavg:
    version: 28
    name: 'mediavg'
    state: 0
    txg: 440650
    pool_guid: 11730812331217717046
    hostid: 530641825
    hostname: 'rooter.home.3geeks.org'
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 11730812331217717046
        children[0]:
            type: 'raidz'
            id: 0
            guid: 2141238275387851622
            nparity: 1
            metaslab_array: 30
            metaslab_shift: 36
            ashift: 12
            asize: 7984384049152
            is_log: 0
            create_txg: 4
            children[0]:
                type: 'disk'
                id: 0
                guid: 8222953817252947832
                path: '/dev/da0p3'
                phys_path: '/dev/da0p3'
                whole_disk: 1
                DTL: 123
                create_txg: 4
            children[1]:
                type: 'disk'
                id: 1
                guid: 10598772377339347959
                path: '/dev/da2p3'
                phys_path: '/dev/da2p3'
                whole_disk: 1
                DTL: 122
                create_txg: 4
            children[2]:
                type: 'disk'
                id: 2
                guid: 17878786601530240982
                path: '/dev/da1p3'
                phys_path: '/dev/da1p3'
                whole_disk: 1
                DTL: 121
                create_txg: 4
            children[3]:
                type: 'disk'
                id: 3
                guid: 2602895078436511407
                path: '/dev/da3p3'
                phys_path: '/dev/da3p3'
                whole_disk: 1
                DTL: 120
                create_txg: 4