What's changed: Revamped AZ-900 Chapter 4 to the new depth and added security coverage (Zero Trust/defense in depth/Defender for Cloud/RBAC/external ID) to the identity section
4.1Storage Services
Understand storage accounts and their four data services (Blob, File, Queue, Table), Blob access tiers (Hot/Cool/Cold/Archive), redundancy (LRS/ZRS/GRS/GZRS), and data migration tools.
The container for cloud data is a storage account, which houses four data services (Blob, File, Queue, Table) for different purposes. You tune data along two axes: "access tiers" that lower storage cost, and "redundancy" that protects against failures. Understanding these two axes (cost vs availability) separately is the key to this section.
4.1.1Storage account and data services
A storage account offers four data services together; which you use depends on "what you want to store." Note that VM OS/data disks are provided by managed disks (a dedicated service built on Blob) and are separate from these.
| Service | Data kind | Typical use |
|---|---|---|
| Blob | Unstructured (objects) | Images, video, backups, logs |
| File | File shares (SMB/NFS) | Shared mount from many machines |
| Queue | Messages | Async messaging between components |
| Table | NoSQL key-value | Cheap, large structured data |
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