Minor - P4 My config db ctonains the usual expected stuff, but "show dbs" and the listDatabases commands executed via the mongos claim it is empty. On 3.0.x mongos we showed the actual size of the config db.
[scripts] (v20151027)$ /var/lib/mongodb-mms-automation/mongodb-osx-x86_64-3.2.0-rc1/bin/mongo localhost:28017 MongoDB shell version: 3.2.0-rc1 connecting to: localhost:28017/test mongos> db.version() 3.2.0-rc1 mongos> show dbs admin (empty) alphabet 0.000GB config (empty) food 0.000GB randomStuff 0.001GB mongos> use admin switched to db admin mongos> db.runCommand({listDatabases:1}) { "databases" : [ { "name" : "alphabet", "sizeOnDisk" : 131072, "empty" : false, "shards" : { "red_0" : 131072 } }, { "name" : "food", "sizeOnDisk" : 503808, "empty" : false, "shards" : { "red_0" : 356352, "red_1" : 147456 } }, { "name" : "randomStuff", "sizeOnDisk" : 1093632, "empty" : false, "shards" : { "red_0" : 1081344, "red_1" : 12288 } }, { "name" : "config" }, { "name" : "admin" } ], "totalSize" : 1728512, "totalSizeMb" : 1, "ok" : 1 }