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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.
I believe that if you are using a rolling 1000GB per day (ie, adding files and deleting files along the way to stay around 1000GB all the time), you would be billed for 1000GB. So, as far as I know, your assumption there is correct.
To back this up, we have a similar EFS volume that varies between 400-800GB because it keeps a rolling X days of data and my monthly bill shows about 600GB billed at .30 or $180. So it definitely an average amount that you have used over the month.
As for IA, I think things can get to IA based on time only (ie, not touched for X days, moves to IA). Not sure if that model works for you.
As far as burst credits go, I would watch the performance and Burst credit balance. With 1TB it should be able to brust 50% of the time per https://docs.aws.amazon.com/efs/latest/ug/performance.html. If you need more non-burst performance, you can artificially increase the size of the EFS volume to increase the speed after burst is exhausted.
Edited by: smaybs on Jul 29, 2020 2:40 PM
Edited by: smaybs on Jul 29, 2020 2:48 PM
1000 GB stored in EFS standard storage for 1 hour per day would equal 31,000 GB-Hours/month (1000 GB x 31 days x 1 hour) . The total monthly standard storage charge would be $12.50. (31,000 GB-Hours x (1 month / 744 hours) x $0.30/GB-month).
Infrequent access (IA) does not make sense for the use case you described where files are stored on EFS for less than an hour per day. Files that are not accessed for a minimum of 7 days can be moved from EFS standard to EFS IA.
With Bursting Throughput mode, throughput on Amazon EFS scales as a file system stored in the standard storage class grows. File systems over 1 TiB in the standard storage class can burst to 100 MiB/s per TiB of data stored in the file system. Alternatively, you may provision throughput up to 1 GiB.
Edited by: morschm on Jul 29, 2020 3:53 PM
Edited by: morschm on Jul 29, 2020 4:01 PM
Edited by: morschm on Jul 29, 2020 4:07 PM
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