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?
