I have a MongoDB with 3 shards: A, B, C. B's disk is full so everytime I start mongod it eventually stops. However, A and C still have GB of space.

Hiring a new server with more space than B and moving all there is... a bit exaggerated. The simplest and fastest answer would be to move some data from B to A or C.

But I don't know if this is possible. Is there a way to move data from one shard to another?

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