Mongodb 1 slice is full, will insert operation be automatically guided to the second slice?

  mongodb, question

After two slices, it was found that most of the targets of the insert operation were slice 1, which caused the disk of slice 1 to fill up immediately.

If it is full, will the subsequent insert operation be automatically guided to slice 2? Or is it a mistake or an overflow?

After slicing, the data is inserted into slice 1. This indicates that there is a problem with fragmentation.

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