Cost an EFS file system across Standard, Infrequent Access and Archive tiers including the per-GB read charge.
EFS Standard is an order of magnitude dearer per GB than Infrequent Access, but the cold tiers add a per-GB charge every time data is read back, so the saving only holds for files that are genuinely idle. Lifecycle management moves files after a configurable idle period, and a policy that is too aggressive turns a storage saving into a larger access bill. All rates here are user-supplied list prices to verify on the AWS EFS pricing page for your region. EFS is often the most expensive GB in an account, so knowing the cold-tier break-even in reads per month is what makes a lifecycle policy safe to enable on a shared home directory.
EFS Storage
cost = Σ(tier share x GB x tier rate) + cold GB read x access charge, with the shares normalised to 100%.
cost = Σ(tier share x GB x tier rate) + cold GB read x access charge, with the shares normalised to 100%. EFS Standard is an order of magnitude dearer per GB than Infrequent Access, but the cold tiers add a per-GB charge every time data is read back, so the saving only holds for files that are genuinely idle. Lifecycle management moves files after a configurable idle period, and a policy that is too aggressive turns a storage saving into a larger access bill. All rates here are user-supplied list prices to verify on the AWS EFS pricing page for your region.
EFS is often the most expensive GB in an account, so knowing the cold-tier break-even in reads per month is what makes a lifecycle policy safe to enable on a shared home directory.
This calculator takes 9 inputs: Data in the file system, Share in Standard, Share in Infrequent Access, Share in Archive, Standard price, Infrequent Access price, Archive price, Data read from the cold tiers each month, Cold-tier access charge. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.
Divide the monthly per-GB saving by the per-GB access charge. With a 0.284 USD saving and a 0.01 USD access fee, a GB can be read about 28 times a month before IA costs more than Standard.