不可达/健康的副本集

use*_*750 5 replication sharding mongodb

我正在尝试在现有集合中再添加一个副本集,但在可达性方面遇到问题。我们得到Notreachable/healthy replica set的原因是什么?

    "name" : "IP ADDRESS",
    "health" : 0,
    "state" : 8,
    "stateStr" : "(not reachable/healthy)",
    "uptime" : 0,
    "optime" : {
        "t" : 0,
        "i" : 0
    },
    "optimeDate" : ISODate("1970-01-01T00:00:00Z"),
    "lastHeartbeat" : ISODate("2013-06-18T10:52:50Z"),
    "lastHeartbeatRecv" : ISODate("1970-01-01T00:00:00Z"),
    "pingMs" : 0
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