Wrong sharding on mongoDB 3.0
I have lowered the chunksize to 1 MB: 

 { "_id" : "chunksize", "value" : 1 }


I inserted now about 10.000 documents.

If I look at the sh.status(), I see this:

Shard shard0000 at 192.168.212.182:27018
 data : 1.33Mb docs : 5761 chunks : 4
 estimated data per chunk : 343kb
 estimated docs per chunk : 1440

Shard shard0001 at 192.168.212.106:27018
 data : 1017kb docs : 4249 chunks : 3
 estimated data per chunk : 339kb
 estimated docs per chunk : 1416

Totals
 data : 2.33Mb docs : 10010 chunks : 7
 Shard shard0000 contains 57.41% data, 57.55% docs in cluster, avg obj size on shard : 243b
 Shard shard0001 contains 42.58% data, 42.44% docs in cluster, avg obj size on shard : 245b


Also I run the scripts AllChunkInfo("Vision_1282.Group"), with this result:

mongos&gt; AllChunkInfo("Vision_1282.Group")
ChunkID,Shard,ChunkSize,ObjectsInChunk
Vision_1282.Group-groepNr_MinKeyvalId_MinKey,shard0001,83504,301
Vision_1282.Group-groepNr_"1"valId_"2000",shard0001,1920,8
Vision_1282.Group-groepNr_"1"valId_"2002",shard0001,974144,4012
Vision_1282.Group-groepNr_"2"valId_"1",shard0000,524384,2138
Vision_1282.Group-groepNr_"3"valId_"4",shard0000,498704,2031
Vision_1282.Group-groepNr_"4"valId_"4",shard0000,292800,1220
Vision_1282.Group-groepNr_"4"valId_"6",shard0000,113520,473
***********Summary Chunk Information***********
Total Chunks: 7
Average Chunk Size (bytes): 355568
Empty Chunks: 0
Average Chunk Size (non-empty): 355568


So you are right, the records were to small and the chunksize was to big.

Tx.