{
  "driver": "rbd",
  "pool": "rbdpool",
  "image": "rbdimg",
  "server": [
    {
      "host": "host1.example.com",
      "port": "0"
    },
    {
      "host": "host2.example.com",
      "port": "0"
    }
  ]
}
{
  "driver": "iscsi",
  "portal": "example.org:3260",
  "target": "iscsitarget",
  "lun": 1,
  "transport": "tcp"
}