Bursting throughput mode is an Amazon EFS configuration with a small baseline throughput and temporary higher throughput when the filesystem has accumulated burst credits. The baseline and burst capacity increase with stored data, subject to AWS limits. section 9.5.2
EFS provides a baseline of 50 MiBps per TiB, with a 1 MiBps minimum, and can burst to 100 MiBps per TiB, with a 100 MiBps minimum. Using less than the baseline accumulates credits; sustained use above it consumes them. Credit balances are capped, so bursting is temporary. section 9.5.2
A 500 GiB filesystem
A 500 GiB filesystem can accumulate credits representing access to 2160 GiB within 24 hours, allowing maximum bursting at 100 MiBps for about six hours. A single EC2 client still cannot transfer more than 500 MiBps to EFS. section 9.5.2
Choose provisioned throughput instead when an application requires high, constant throughput. Monitor burst-credit balance with a CloudWatch alarm so workloads do not silently lose their temporary performance headroom. section 9.7
