DataSync from NFS to AWS performance

The EFS file system may be reaching its maximum throughput capacity if it is using the bursting throughput mode. You can check the BurstBalance CloudWatch metric to see if burst credits are being depleted.

The NFS volume could be limiting throughput due to its own specifications and usage. DataSync would not be able to transfer faster than the NFS volume can provide data.

Network bandwidth between the on-premises NFS server and AWS could be a bottleneck if below 60 MB/s. Factors like available network interfaces and internet connectivity would impact this.

The EFS client performance on the DataSync agent host could potentially bottleneck if not optimized. Ensuring the latest EFS client version is in use helps maximize throughput.

Running multiple concurrent DataSync tasks could overwhelm the available throughput capacity if not accounting for total data transfer needs across tasks.