{
    "rule_id": 3,
    "rule_name": "3host4osd",
    "ruleset": 3,
    "type": 3,
    "min_size": 12,
    "max_size": 12,
    "steps": [
        {
            "op": "set_chooseleaf_tries",
            "num": 200
        },
        {
            "op": "set_choose_tries",
            "num": 500
        },
        {
            "op": "take",
            "item": -2,
            "item_name": "default~hdd"
        },
        {
            "op": "choose_indep",
            "num": 3,
            "type": "host"
        },
        {
            "op": "choose_indep",
            "num": 4,
            "type": "osd"
        },
        {
            "op": "emit"
        }
    ]
}