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Glacier deep archive and retrieval pricing fix (#729)

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Added Deep Archive, removed outdated pricing caveats on standard
glacier retrievals.
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Corey Quinn 2019-10-20 08:49:04 -04:00 • committed by Maish
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@ -1216,6 +1216,7 @@ Glacier
- **Glacier** is a lower-cost alternative to S3 when data is infrequently accessed, such as for archival purposes.
- It’s only useful for data that is rarely accessed. It generally takes [3-5 hours](https://aws.amazon.com/glacier/faqs/#dataretrievals) to fulfill a retrieval request.
- AWS [has not officially revealed](https://en.wikipedia.org/wiki/Amazon_Glacier#Storage) the storage media used by Glacier; it may be low-spin hard drives or even tapes.
- AWS has released an even more cost effective storate tier called [Glacier Deep Archive](https://aws.amazon.com/blogs/aws/new-amazon-s3-storage-class-glacier-deep-archive/) that offers ~12 hour retrieval latencies, but costs roughly a thousand dollars per month per petabyte.
### Glacier Tips
@ -1225,7 +1226,6 @@ Glacier
- 🔸Getting files off Glacier is glacially slow (typically 3-5 hours or more).
- 🔸Due to a fixed overhead per file (you pay per PUT or GET operation), uploading and downloading many small files on/to Glacier might be very expensive. There is also a 32k storage overhead per file. Hence it’s a good idea is to archive files before upload.
- 🔸Glacier’s pricing policy is reportedly pretty complicated: “Glacier data retrievals are priced based on the peak hourly retrieval capacity used within a calendar month.” Some more info can be found [here](https://medium.com/@karppinen/how-i-ended-up-paying-150-for-a-single-60gb-download-from-amazon-glacier-6cb77b288c3e#.wjl4dbgza) and [here](https://news.ycombinator.com/item?id=10921365).
- 💸Be aware of the per-object costs of archiving S3 data to Glacier. [It costs $0.05 per 1,000 requests](https://aws.amazon.com/s3/pricing/). If you have large numbers of S3 objects of relatively small size, [it will take time to reach a break-even point](https://alestic.com/2012/12/s3-glacier-costs/) (initial archiving cost versus lower storage pricing).
RDS