Elastic File System (EFS) is, on the surface, a nice addition to the AWS storage options: based on the long-lived Networked File System (NFS), it lets you share a single volume between multiple EC2 instances. It also has the benefit that you only pay for what you actually use: while more expensive than Elastic Block Store (EBS), you don't have to pay for provisioned-but-unused capacity.
The dark side of EFS is performance. Unlike EBS, it's not measured in IOPS, but in megabytes per second of throughput. And it's a "burstable" performance model: while you can get a peak throughput of 100 MiB/second (or higher, for volumes over a terabyte), you can't sustain that rate. Instead, you get a "baseline" rate that's dependent on your volume size, and a pool of credits that is consumed or replenished depending on whether your actual usage is above or below that baseline rate.
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