{
  "node-name": "node-b-f",
  "read-only": false,
  "cache": {
    "direct": false,
    "no-flush": true
  },
  "driver": "qcow2",
  "file": "node-a-s",
  "backing": "node-b-f"
}
{
  "driver": "rbd",
  "pool": "rbdpool",
  "image": "rbdimg",
  "server": [
    {
      "host": "host1.example.com",
      "port": "0"
    },
    {
      "host": "host2.example.com",
      "port": "0"
    }
  ],
  "user": "testuser-rbd",
  "auth-client-required": [
    "cephx",
    "none"
  ],
  "key-secret": "node-a-s-secalias",
  "node-name": "node-a-s",
  "auto-read-only": true,
  "discard": "unmap",
  "cache": {
    "direct": false,
    "no-flush": true
  }
}
{
  "node-name": "node-b-f",
  "read-only": true,
  "cache": {
    "direct": false,
    "no-flush": true
  },
  "driver": "qcow2",
  "file": "node-b-s",
  "backing": null
}
{
  "driver": "iscsi",
  "portal": "example.org:3260",
  "target": "iscsitarget",
  "lun": 1,
  "transport": "tcp",
  "node-name": "node-b-s",
  "auto-read-only": true,
  "discard": "unmap",
  "cache": {
    "direct": false,
    "no-flush": true
  }
}