mongos> db.gridfs.chunks.stats()
{
	"sharded" : true,
	"ns" : "acceptance_test.gridfs.chunks",
	"count" : 12,
	"numExtents" : 4,
	"size" : 3505984,
	"storageSize" : 4222976,
	"totalIndexSize" : 73584,
	"indexSizes" : {
		"_id_" : 24528,
		"files_id_1_n_1" : 24528,
		"files_id_hashed" : 24528
	},
	"avgObjSize" : 292165.3333333333,
	"nindexes" : 3,
	"nchunks" : 6,
	"shards" : {
		"shard0000" : {
			"ns" : "acceptance_test.gridfs.chunks",
			"count" : 12,
			"size" : 3505984,
			"avgObjSize" : 292165.3333333333,
			"storageSize" : 4206592,
			"numExtents" : 2,
			"nindexes" : 3,
			"lastExtentSize" : 4198400,
			"paddingFactor" : 1,
			"systemFlags" : 1,
			"userFlags" : 0,
			"totalIndexSize" : 24528,
			"indexSizes" : {
				"_id_" : 8176,
				"files_id_hashed" : 8176,
				"files_id_1_n_1" : 8176
			},
			"ok" : 1
		},
		"shard0001" : {
			"ns" : "acceptance_test.gridfs.chunks",
			"count" : 0,
			"size" : 0,
			"storageSize" : 8192,
			"numExtents" : 1,
			"nindexes" : 3,
			"lastExtentSize" : 8192,
			"paddingFactor" : 1,
			"systemFlags" : 1,
			"userFlags" : 0,
			"totalIndexSize" : 24528,
			"indexSizes" : {
				"_id_" : 8176,
				"files_id_hashed" : 8176,
				"files_id_1_n_1" : 8176
			},
			"ok" : 1
		},
		"shard0002" : {
			"ns" : "acceptance_test.gridfs.chunks",
			"count" : 0,
			"size" : 0,
			"storageSize" : 8192,
			"numExtents" : 1,
			"nindexes" : 3,
			"lastExtentSize" : 8192,
			"paddingFactor" : 1,
			"systemFlags" : 1,
			"userFlags" : 0,
			"totalIndexSize" : 24528,
			"indexSizes" : {
				"_id_" : 8176,
				"files_id_hashed" : 8176,
				"files_id_1_n_1" : 8176
			},
			"ok" : 1
		}
	},
	"ok" : 1
}