sh.updateZoneKeyRange()

sh.addShardToZone("shardA", "DC1")
sh.addShardToZone("shardB", "DC2")

sh.updateZoneKeyRange(
    "exampledb.contacts",
    { zip: 10001 },
    { zip: 10090 },
    "DC1"
);
sh.updateZoneKeyRange(
    "exampledb.contacts",
    { zip: 90001 },
    { zip: 96054 },
    "DC2"
);

sh.enableSharding("exampledb")

sh.shardCollection("exampledb.contacts",  { zip: 1 } );

sh.status()

--- Sharding Status ---
  sharding version: {
    "_id" : 1,
    "minCompatibleVersion" : 5,
    "currentVersion" : 6,
    "clusterId" : ObjectId("5b80c06d35a961fd0ae1986d")
  }
  shards:
        {  "_id" : "shardA",  "host" : "shardA/mongodb0.example.net:27018,mongodb1.example.net:27018,mongodb2.example.net:27018",  "state" : 1,  "tags" : [ "DC1" ] }
        {  "_id" : "shardB",  "host" : "shardB/mongodb3.example.net:27018,mongodb4.example.net:27018,mongodb5.example.net:27018",  "state" : 1,  "tags" : [ "DC2" ] }
  active mongoses:
        "4.2.0" : 2
  autosplit:
        Currently enabled: yes
  balancer:
        Currently enabled:  yes
        Currently running:  no
        Failed balancer rounds in last 5 attempts:  0
        Migration Results for the last 24 hours:
                No recent migrations
  databases:
        {  "_id" : "config",  "primary" : "config",  "partitioned" : true }
        {  "_id" : "exampledb",  "primary" : "shardA",  "partitioned" : true,  "version" : {  "uuid" : UUID("6c351bcf-acd2-4fd9-82d8-9f6bd7321558"),  "lastMod" : 1 } }
                exampledb.contacts
                        shard key: { "zip" : 1 }
                        unique: false
                        balancing: true
                        chunks:
                                shardA   3
                                shardB   2
                        { "zip" : { "$minKey" : 1 } } -->> { "zip" : 10001 } on : shardA Timestamp(1, 0)
                        { "zip" : 10001 } -->> { "zip" : 10090 } on : shardA Timestamp(1, 1)
                        { "zip" : 10090 } -->> { "zip" : 90001 } on : shardB Timestamp(1, 2)
                        { "zip" : 90001 } -->> { "zip" : 96054 } on : shardB Timestamp(1, 3)
                        { "zip" : 96054 } -->> { "zip" : { "$maxKey" : 1 } } on : shardA Timestamp(1, 4)
                          tag: DC1  { "zip" : 10001 } -->> { "zip" : 10090 }
                          tag: DC2  { "zip" : 90001 } -->> { "zip" : 96054 }

sh.addShardToZone("shardA", "FacilityAlpha")
sh.addShardToZone("shardB", "FacilityAlpha")

sh.updateZoneKeyRange(
   "examples.metrics",
   { "_id" : MinKey, "facility" : MinKey },
   { "_id" : MaxKey, "facility" : MaxKey },
   "FacilityAlpha"
);

sh.enableSharding("examples")

sh.shardCollection(
  "examples.metrics",
  { "_id" : "hashed", "facility" : 1 },
  false,
  { presplitHashedZones: true }
)

sh.status()

--- Sharding Status ---
databases:
  {  "_id" : "config",  "primary" : "config",  "partitioned" : true }
  {  "_id" : "examples",  "primary" : "shardA",  "partitioned" : true,  "version" : {  "uuid" : UUID("245f8abf-a363-48b0-8208-2a5b577bbb4e"),  "lastMod" : 1 } }
    examples.metrics
      shard key: { "_id" : "hashed", "facility" : 1 }
      unique: false
      balancing: true
      chunks:
        shardA  2
        shardB  2
      { "_id" : { "$minKey" : 1 }, "facility" : { "$minKey" : 1 } } -->> { "_id" : NumberLong("-4611686018427387902"), "facility" : { "$minKey" : 1 } } on : shardA Timestamp(1, 0)
      { "_id" : NumberLong("-4611686018427387902"), "facility" : { "$minKey" : 1 } } -->> { "_id" : NumberLong(0), "facility" : { "$minKey" : 1 } } on : shardA Timestamp(1, 1)
      { "_id" : NumberLong(0), "facility" : { "$minKey" : 1 } } -->> { "_id" : NumberLong("4611686018427387902"), "facility" : { "$minKey" : 1 } } on : shardB Timestamp(1, 2)
      { "_id" : NumberLong("4611686018427387902"), "facility" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 }, "facility" : { "$maxKey" : 1 } } on : shardB Timestamp(1, 3)
        tag: FacilityAlpha  { "_id" : { "$minKey" : 1 }, "facility" : { "$minKey" : 1 } } -->> { "_id" : { "$maxKey" : 1 }, "facility" : { "$maxKey" : 1 } }

sh.addShardToZone("shardA", "FacilityAlpha")
sh.addShardToZone("shardB", "FacilityBaker")

sh.updateZoneKeyRange(
   "examples.metrics",
   { "facility": "FacilityAlpha", "_id" : MinKey },
   { "facility": "FacilityBaker", "_id" : MinKey },
   "FacilityAlpha"
);

sh.updateZoneKeyRange(
   "examples.metrics",
   { "facility": "FacilityBaker", "_id" : MinKey },
   { "facility": MaxKey, "_id" : MinKey },
   "FacilityBaker"
);

sh.enableSharding("examples")

sh.shardCollection(
  "examples.metrics",
  { "facility" : 1, "_id" : "hashed"},
  false,
  { presplitHashedZones: true }
)

sh.status()

--- Sharding Status ---
  databases:
    {  "_id" : "config",  "primary" : "config",  "partitioned" : true }
    {  "_id" : "examples",  "primary" : "shardA",  "partitioned" : true,  "version" : {  "uuid" : UUID("6c351bcf-acd2-4fd9-82d8-9f6bd7321558"),  "lastMod" : 1 } }
      examples.metrics
        shard key: { "facility" : 1, "_id" : "hashed" }
        unique: false
        balancing: true
        chunks:
          shardA  3
          shardB  3
        { "facility" : { "$minKey" : 1 }, "_id" : { "$minKey" : 1 } } -->> { "facility" : "FacilityAlpha", "_id" : { "$minKey" : 1 } } on : shard1 Timestamp(1, 0)
        { "facility" : "FacilityAlpha", "_id" : { "$minKey" : 1 } } -->> { "facility" : "FacilityAlpha", "_id" : NumberLong(0) } on : shard1 Timestamp(1, 1)
        { "facility" : "FacilityAlpha", "_id" : NumberLong(0) } -->> { "facility" : "FacilityBaker", "_id" : { "$minKey" : 1 } } on : shard1 Timestamp(1, 2)
        { "facility" : "FacilityBaker", "_id" : { "$minKey" : 1 } } -->> { "facility" : "FacilityBaker", "_id" : NumberLong(0) } on : shard2 Timestamp(1, 3)
        { "facility" : "FacilityBaker", "_id" : NumberLong(0) } -->> { "facility" : { "$maxKey" : 1 }, "_id" : { "$minKey" : 1 } } on : shard2 Timestamp(1, 4)
        { "facility" : { "$maxKey" : 1 }, "_id" : { "$minKey" : 1 } } -->> { "facility" : { "$maxKey" : 1 }, "_id" : { "$maxKey" : 1 } } on : shard2 Timestamp(1, 5)
          tag: FacilityAlpha  { "facility" : "FacilityAlpha", "_id" : { "$minKey" : 1 } } -->> { "facility" : "FacilityBaker", "_id" : { "$minKey" : 1 } }
          tag: FacilityBaker  { "facility" : "FacilityBaker", "_id" : { "$minKey" : 1 } } -->> { "facility" : { "$maxKey" : 1 }, "_id" : { "$minKey" : 1 } }