Dear Team,
 
Please find the below information that there is a huge difference in the data size between the shards.
 
mongos> db.fs.chunks.getShardDistribution()
 
Shard rs0 at rs0/Server1:27017,Server2:27017,Server3:27017
 data : 940.71GiB docs : 3867359 chunks : 62967
 estimated data per chunk : 15.29MiB
 estimated docs per chunk : 61
 
Shard rs1 at rs1/Server4:27017,Server5:27017,Server6:27017
 data : 2389.37GiB docs : 9811392 chunks : 62966
 estimated data per chunk : 38.85MiB
 estimated docs per chunk : 155
 
Totals
 data : 3330.08GiB docs : 13678751 chunks : 125933
 Shard rs0 contains 28.24% data, 28.27% docs in cluster, avg obj size on shard : 255KiB
 Shard rs1 contains 71.75% data, 71.72% docs in cluster, avg obj size on shard : 255KiB
 
Please help me resolving this issue and please let me know the cause of this issue. 
 
Thank you so much in advance. 
 
Best Regards,
Prinsha Tom.