GSM-46043
the number of unique chunks in a shardspace. This parameter does not apply to user-defined sharding or a federated database. All shardgroups in a shardspace have the same number of chunks. If this parameter is not specified, the default number of chunks is determined at the time of execution of the first DEPLOY command and is 120 per database of the shardgroup
Cause
GDSCTL help message.