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clone_autotune_concurrency  is disabled, clone_max_concurrency  defines the number of threads spawned for a remote cloning operation. 

A minimum data transfer rate of 1 mebibyte (MiB) per thread is recommended for remote cloning operations. The data transfer rate for a remote cloning operation is controlled by the clone_max_data_bandwidth  variable. 

• clone_max_data_bandwidth 

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Defines the maximum data transfer rate in mebibytes (MiB) per second for a remote cloning operation. This variable helps manage the performance impact of a cloning operation. A limit should be set only when donor disk I/O bandwidth is saturated, affecting performance. A value of 0 means “unlimited” , which permits cloning operations to run at the highest possible data transfer rate. This setting is only applicable to the recipient MySQL server instance. 

The minimum data transfer rate is 1 MiB per second, per thread. For example, if there are 8 threads, the minimum transfer rate is 8 MiB per second. The clone_max_concurrency  variable controls the maximum number threads spawned for a remote cloning operation. 

The requested data transfer rate specified by clone_max_data_bandwidth  may differ from the actual data transfer rate reported by the DATA_SPEED  column in the performance_schema.clone_progress  table. If your cloning operation is not achieving the desired data transfer rate and you have available bandwidth, check I/O usage on the recipient and donor. If there is underutilized bandwidth, I/O is the next mostly likely bottleneck. 

• clone_max_network_bandwidth 

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