I need some help understanding the different storage tiers in Azure Blob Storage, particularly Hot, Cool, Cold, and Archive. We're planning to archive 2TB of data from our Azure network drives, and I'm unsure how frequently staff will need to access the archived files. Once we remove access in the coming week, that should give us a better idea; I suspect we'll need a document from the archive about once a month. Here are my main questions: 1) If we choose the Cool tier, does that mean all files need to be uploaded for a minimum of 30 days before I can access them without penalties? After those 30 days, can I access without extra charges beyond standard read/write fees? 2) If I need to read or download a single document, how much might that cost? Is it relatively low, like under €5? 3) The Cool tier is priced at €0.00868 per GB, which would be around €17 a month for 2TB. Are there any other potential costs outside of penalties and retrieval fees? Like, do we need to pay for a server on top of that, or is it included in the price? Just to clarify, our data center is an Azure server already, and we're looking to move this 2TB of data.
3 Answers
The tiers work like this: Hot is for frequent access, Cool is for occasional access, and Archive is for long-term storage where you hope you won’t need to access the data often. You can still read from the Cool tier before the 30 days, but you’ll incur charges if you delete or move files before that period. If you only pull one document from your 2TB, the cost would be negligible—like just a few cents. Just be mindful that your monthly costs will include storage plus transaction fees, but no hidden server fees. €17/month is spot on for the Cool tier if you’re accessing files infrequently!
In terms of storage types, think of it like this: Hot is SSD, Cool is connected tape, and Archive is more like offsite tape. Retrieving from the Archive takes time—around 1 to 2 hours, but it could take longer when demand is high. Don’t forget about additional costs like private networking or egress fees, which shouldn’t be too significant, just a dollar or two. Also, be aware of early deletion fees, which you’ll want to check based on retention minimums for each tier.
Right, and rehydration can sometimes take up to 15 hours! But usually, it’s quicker. Just be prepared, especially if you need something fast.
For the most accurate pricing details, check out Azure's official pricing page for Blob Storage. It'll give you a breakdown of costs and help you plan based on your expected usage: https://azure.microsoft.com/en-us/pricing/details/storage/blobs/
Thanks a lot! That clarification makes it easier to decide.