With Amazon EFS, you pay only for the resources that you use. There is no minimum fee and there are no set-up charges. Amazon EFS offers two storage classes: the Standard storage class, and the Infrequent Access storage class that's cost-optimized for files not accessed every day.
Amazon EFS Standard Storage Class (Default)
The Standard storage class is designed for active file system workloads and you pay only for the amount of file system storage you use per month.
Amazon EFS Infrequent Access Storage Class
The Infrequent Access storage class is cost-optimized for files accessed less frequently. Data stored on the Infrequent Access storage class costs less than Standard and you will pay a fee each time you read from or write to a file.
Amazon EFS Bursting Throughput (Default)
In the default Bursting Throughput mode, there are no charges for bandwidth or requests and you get a baseline rate of 50 KB/s per GB of throughput included with the price of storage.
Amazon EFS Provisioned Throughput
You can optionally select the Provisioned Throughput mode and provision the throughput of your file system independent of the amount of data stored and pay separately for storage and throughput. Like the default Bursting Throughput mode, the Provisioned Throughput mode also includes 50 KB/s per GB (or 1 MB/s per 20 GB) of throughput in the price of storage. You are billed only for the throughput provisioned above what you are provided based on data you have stored.
Within your first 12 months on AWS, you can use up to 5 GB/month for free.
The storage amount billed in a month is based on the average storage space used throughout the month. Your storage usage is measured in "GB-Month," which are added up at the end of the month to generate your monthly charges.
The throughput amount billed in a month is based on the average provisioned throughput for the month. Your throughput is measured in "MB/s-Month", which are added up at the end of the month to generate your monthly charges.
Assume your file system is located in the US East (N. Virginia) region, uses 100 GB of storage for 15 days in March, and 250 GB of storage for the final 16 days in March. At the end of March, you would have the following usage in GB-Hours:
Total usage (GB-Hours) = [100 GB x 15 days x (24 hours / day)] + [250 GB x 16 days x (24 hours / day)] = 132,000 GB-Hours
We add up GB-Hours and convert to GB-Month to calculate monthly charges:
Total Monthly Storage Charge = 177 GB-Month x $0.30 = $53.10
This example compare two scenarios in which the customer stores 100 GB in the US East (N. Virginia) region. In the first scenario the customer selects the default Bursting Throughput mode and in the second scenario the customer configures Provisioned Throughput and provisions 10 MB/s of throughput. Please note that the customer is entitled to a baseline throughput of 5 MB/s in both scenarios because he is storing 100 GB of data on Amazon EFS.
Default Bursting Throughput: 100 GB of data using the default Bursting Throughput mode
Total usage of storage (GB-Hours) = 100 GB x 31 days x 24 hours / day = 74,400 GB-Hours
Total usage of storage (GB-Month) = 74,400 GB-hours / (31 days / month x 24 hours / day) = 100 GB-Month
Total monthly storage charge = 100 GB-Month x $0.30 = $30.00
Provisioned Throughput: 100 GB of data and 10 MB/s of Provisioned Throughput
Total monthly storage charge (see above calculations) = 100 GB-Month x $0.30 = $30.00
Default throughput (MB/s-Hours) = (74,400 GB-Hours / 20 GB-Hours) * 1 MB/s-Hour = 3,720 MB/s-Hours
Total provisioned throughput (MB/s-Hours) = 10 MB/s x 31 x 24 hours/day = 7,440 MB/s-Hours
Total billable provisioned throughput (MB/s-Hours) = 7,440 MB/s-Hours – 3,720 MB/s-Hours = 3,720 MB/s-Hours
Total billable provisioned throughput (MB/s-Month) = 3,720 MB/s-Hours / (31 days/month x 24 hours/day) = 5 MB/s-Month
Total monthly Provisioned Throughput charge = 5 MB/s-Month x 6.00 = $30.00
Total monthly charge = Total monthly storage charge + Total monthly throughput charge = $30.00 + $30.00 = $60.00
Assume your file system is located in the US East (N. Virginia) region, uses 200 GB of storage in the Standard storage class and 800 GB of storage in the Infrequent Access Storage class. All data in the Infrequent Access storage class is accessed once per week:
Total storage (GB-Hours) = [200 GB x $0.30/GB-Month] + [800 GB x $0.045/GB-Month] = $96
Total access charges = [800 GB * $0.01/GB per day * 4 days] = $32
Total Monthly charge = $96 + $32 = $128
Moving your Amazon EFS file data can be managed simply with AWS DataSync.
To simplify and accelerate data transfers in and out of Amazon EFS, you can use AWS DataSync, a managed online data transfer service. DataSync’s usage-based pricing is simple and predictable. You pay only for data transferred, at a flat, per-gigabyte rate—no software licenses, contracts, maintenance fees, development cycles or required hardware.
Backing up your Amazon EFS file data can be managed simply with AWS Backup.
To back up your Amazon EFS file data you can use AWS Backup, a fully managed backup service that makes it easy to centralize and automate the back up of data across AWS services. AWS Backup provides you with a single place to monitor backup activity and to find and restore backups when needed. With AWS Backup, you pay only for the amount of backup storage you use and the amount of backup data you restore in the month. There is no minimum fee and there are no set-up charges.
Amazon EFS offers price advantages over self-managed cloud alternatives. For more information on how much can be saved, see the Amazon EFS Total Cost of Ownership (TCO) example here.
If you are investigating the cost advantages of moving to the AWS Cloud, you can enter your on-premises configurations into our TCO calculators here.