issue with node-mongodb-native commit 5fd127e

code.js

function openFile(db, filename, callback) {
  var gs = new mongodb.GridStore(db, filename, "r");

  gs.open(function(err, gs) {
    if(err) {
      callback(err, gs);
      return;
    }
    callback(null, gs);
  });
}

var Step = require('step');

var retryAsync = function(func, num, errorCallback) { 
  var actions = [];
  for(var i=0; i<num; i++) actions.push(func);
  actions.push(errorCallback);
  Step.apply(null, actions);
}

retryAsync(function() {
    var retry = this;
    openFile(db, filename, function(err, gs) {
        if(err || !gs) {
            setTimeout(retry, 2000);
            return;
        }
        next(null, gs);
    });
}, 5, function() {
    error(err || new Error('GrowingFile not found'));
});

driver options.json

{
    "server" : {
        "auto_reconnect": true
    }
  , "replset" : {
        "rs_name"         : "rs0"
      , "read_secondary"  : true
    }
  , "db" : {
        "safe"            : { "w": 3, "wtimeout": 5000 }
    }
  , "user" : "nochan"
  , "pass" : "CHANGE_HERE"
}

rs.status().json

rs0:PRIMARY> rs.status()
{
	"set" : "rs0",
	"date" : ISODate("2012-12-02T23:27:25Z"),
	"myState" : 1,
	"members" : [
		{
			"_id" : 0,
			"name" : "instance1.nochan.fr:27017",
			"health" : 1,
			"state" : 1,
			"stateStr" : "PRIMARY",
			"uptime" : 617262,
			"optime" : Timestamp(1354490596000, 2),
			"optimeDate" : ISODate("2012-12-02T23:23:16Z"),
			"self" : true
		},
		{
			"_id" : 2,
			"name" : "instance3.nochan.fr:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 616759,
			"optime" : Timestamp(1354490596000, 2),
			"optimeDate" : ISODate("2012-12-02T23:23:16Z"),
			"lastHeartbeat" : ISODate("2012-12-02T23:27:24Z"),
			"pingMs" : 0
		},
		{
			"_id" : 3,
			"name" : "instance2.nochan.fr:27017",
			"health" : 1,
			"state" : 2,
			"stateStr" : "SECONDARY",
			"uptime" : 616371,
			"optime" : Timestamp(1354490596000, 2),
			"optimeDate" : ISODate("2012-12-02T23:23:16Z"),
			"lastHeartbeat" : ISODate("2012-12-02T23:27:24Z"),
			"pingMs" : 0
		}
	],
	"ok" : 1
}

you never want to do w:3 because that means that every single write will fail if you have to take down 1 single server for maintenance. you can use w:'majority' instead if you want but w:2 is nearly always enough for most people.

I'll look into the other stuff later today.