Introduction to Azure Storage
Data is the heart of any cloud platform, and Azure offers multiple storage options to fit different needs. As an administrator, you’ll need to know which type of storage to use in each scenario, and how to manage security, performance, and cost.
Why this matters
Azure Storage is a huge part of the AZ-104 exam. Expect at least 15–20% of your questions to involve storage accounts, blobs, files, or replication settings.
Types of Azure Storage
- Blob Storage: Object storage for unstructured data (docs, images, videos, backups).
- Azure Files: Fully managed file shares accessible via SMB/NFS.
- Disk Storage: Managed disks for VMs (OS and data disks).
- Tables & Queues: NoSQL key-value storage and messaging services (less emphasized in AZ-104 but still appear).
Redundancy Options
- LRS (Locally Redundant): 3 copies in a single datacenter.
- GRS (Geo-Redundant): Data copied to a secondary region for disaster recovery.
- ZRS (Zone-Redundant): Copies across availability zones in one region.
- RA-GRS: Same as GRS, but with read-access to the secondary.
Confusion Buster 🚨
Blob vs Disk vs File
– Blob = raw object storage (like a bucket of files).
– Disk = attached to VMs (OS/data disks).
– File = shared drive for multiple users/apps.
Exam trick: Many confuse Blob snapshots with VM disk snapshots — they’re different!
Simple Example
Think of Azure Storage as a supermarket: – Blob = bulk items in a warehouse (unstructured, flexible).
– Disk = personal locker (dedicated to your VM).
– File = shared cupboard everyone can access over SMB.
Exam Tip
If the scenario mentions “unstructured data”, always think Blob Storage. If it says “lift-and-shift file shares”, think Azure Files. If it says “persistent VM data”, think Disk Storage.
What to Expect in the Exam
- Direct Q: “Which redundancy option provides zone-level protection?” → ZRS.
- Scenario: “Company needs to share files across Windows and Linux systems.” → Azure Files with SMB/NFS.
- Trick Q: “GRS keeps 3 copies in the same datacenter.” (False, that’s LRS).