{
    "_id": "cgx",
    "capacity": 1000000000,
    "chunks": [
        {
            "prs": [
                {
                    "segs": [
                        {
                            "node_id": "server-0",
                        }
                    ]
                }
            ]
        },
        {
            "prs": [
                {
                    "segs": [
                        {
                            "node_id": "server-2",
                        }
                    ]
                },
               {
                    "segs": [
                        {
                            "node_id": "server-3",
                        }
                    ]
                }
            ]
        }
    ],
    "health": "healthy",
    "status": "ok"
}

def setDistinctElements(self, result):
            elements = []
            for chunk in getattr(result, 'chunks'):
                for pr in getattr(chunk, 'prs'):
                    for seg in getattr(pRaid, 'segs'):
                        elements.append(getattr(seg, 'node_id'))