Unstructured data: blobs, files, tiers, protection – Azure architecture (AZ-305, lesson 12)

What you learn in this lesson

choose between Blob Storage, Data Lake Storage Gen2, Azure Files and Azure NetApp Files for unstructured data by access type and protocol

weigh access tiers and media tiers against performance and cost and name the limits of the Archive tier

choose redundancy, delete protection, immutability and backup by the risk they protect against

write a decision record with a Bicep sketch for the file estate of Nordlicht Reisen

Nordlicht Reisen GmbH has a file estate of about 40 TB (assumption of the task): contracts, photos for the portal, the originals of the campaign photos and templates that 25 travel agencies open every day. Today everything sits on file servers in Hamburg. The question of this lesson: Which service takes which data, in which tier, with which protection?

Prior knowledge. AZ-104, lesson 2.1 explains storage accounts and redundancy; blob containers, tiers, lifecycle and versions are in AZ-104, lesson 2.3; Azure Files and snapshots in AZ-104, lesson 2.4; Blob Storage from the development side in K3, lessons 3.6.3 and 3.6.5. That is not repeated here. What is new is the decision: which property of a service or a tier rules out a different choice.

The requirement

All quantities and periods are assumptions of the task, not measured.

No.	Requirement	Source	Measure (assumption)
U1	Contracts neither changeable nor deletable for ten years; survive a data center failure	Law, management	4 TB, hardly read after a year
U2	Portal photos retrievable from the internet, survive a zone failure	Portal	6 TB, reading over HTTPS
U3	Campaign originals are preserved; retrieval may take a day	Marketing	30 TB, rarely read
U4	Windows shares with permissions from the on-premises Active Directory	Operations	2 TB, daily, SMB
U5	Data in the EU, primary region `germanywestcentral`	Data protection	base assumption

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