MongoDB Chunk Size setting

The default is 64MB, and the value range is 1 MB to 1024x768.

What does that change cause? The following table summarizes briefly:

Chunk Size Adjustment	splitting times (number of fragments)	number of data across Shard	Data Uniformity	Network transfer times	Migration Times	single-pass migration transmission volume	Query Speed
	decrease		less evenly	less	less	big	faster
Become smaller	Increase	Become more	More uniform	Become more	Become more	Become smaller	Slowing down

In the case of large amounts of data, consider the network bandwidth, if you find that the bandwidth is full, you can consider small chunk size, so that the migration caused by the traffic will be reduced

In the case of good server hardware, such as my server CPU core, memory of up to GB, disk TB. Consider adjusting the size of the chunk to reduce unnecessary shards.

The specific setting is to use the command, do not use the configuration file, refer to the Official document:

http://docs.mongodb.org/manual/tutorial/modify-chunk-size-in-sharded-cluster/

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MongoDB Chunk Size setting