Chapter 11 — Azure Storage Services

What is Azure Storage?

Azure Storage is Microsoft's cloud storage solution for modern data. It provides highly available, massively scalable, durable, and secure storage for all types of data objects.

Azure Storage is used by VMs (for disks), applications (for files and databases), and developers (for queues and tables).

Azure Storage Account

A Storage Account is the top-level container that holds all your Azure storage services. Everything you store in Azure goes into a storage account.

Storage Account: "mystorageaccount"
├── Blob Storage    (unstructured data — files, images, videos)
├── File Storage    (shared file system — like a network drive)
├── Queue Storage   (message queuing between app components)
└── Table Storage   (NoSQL key-value data)

Storage Account Types

1. Azure Blob Storage

What Is It?

Blob Storage stores unstructured data — any type of file in any format. "Blob" stands for Binary Large Object.

Common uses:

• Images and videos served on websites

• Log files

• Backups and archives

• Documents (PDFs, Word files)

• Big data analytics input/output

Blob Types

Access Tiers

Azure Blob Storage offers access tiers based on how frequently you access data:

Archive tier data is offline — it must be rehydrated (brought back online) before you can access it. This takes hours.

2. Azure File Storage

What Is It?

Azure Files provides fully managed file shares in the cloud that are accessible via the SMB (Server Message Block) or NFS (Network File System) protocol — the same protocols used by Windows and Linux file servers.

Your Windows Server (on-premises)
  └── Maps a network drive to:  \\mystorageaccount.file.core.windows.net\myshare
        ↕
  Azure File Share (in the cloud)

Key Features

When to Use Azure Files

• Lift-and-shift applications that depend on file shares

• Replace or supplement on-premises file servers

• Share configuration files between multiple VMs

• Applications that use SMB to write/read data

3. Azure Queue Storage

What Is It?

Azure Queue Storage stores messages that can be retrieved and processed asynchronously. Queues decouple components of an application — allowing them to communicate without directly calling each other.

Application A (Producer)
  │  Writes message: "Process order #12345"
  ▼
  Queue Storage (holds messages — up to 64KB each)
  │  Message waits until consumed
  ▼
Application B (Consumer)
  │  Reads and processes the message
  ▼
  Order #12345 is processed

Key Features

When to Use Queue Storage

• Decoupling application components (producer-consumer pattern)

• Handling bursts of requests without overloading the consumer

• Asynchronous task processing (send email, resize image, process payment)

• Microservices communication

4. Azure Table Storage

What Is It?

Azure Table Storage is a NoSQL key-value store for structured, non-relational data. It stores data in tables of entities (rows), each identified by a unique key.

Table: "CustomerOrders"
PartitionKey  RowKey     CustomerName   OrderDate    Amount
─────────────────────────────────────────────────────────
"US"          "ORD-001"  Alice          2026-01-15   $120.00
"US"          "ORD-002"  Bob            2026-01-16   $85.00
"EU"          "ORD-003"  Claire         2026-01-17   $200.00

Key Concepts

When to Use Table Storage

• Storing user preferences, settings, or metadata

• Session data for web applications

• Non-relational structured data at scale

• IoT device telemetry data

Note: For more advanced NoSQL capabilities (global distribution, multiple APIs), use Azure Cosmos DB instead.

5. Azure Disk Storage

What Is It?

Azure Managed Disks are block-level storage volumes used as the hard drives for Azure Virtual Machines.

Azure Virtual Machine
  ├── OS Disk (C:\ drive) — Contains Windows/Linux OS
  ├── Temporary Disk (D:\ drive) — Ephemeral, lost on reboot
  └── Data Disk(s) — Extra storage you attach to the VM

Disk Types

IOPS = Input/Output Operations Per Second — how fast the disk can read/write.

Storage Redundancy Options

Azure replicates your data to protect against hardware failures. You choose your redundancy level:

Durability with GRS: 99.999999999% (that's eleven 9s!)

Storage Services Summary

Quick Recap

Blob    → Store any file type (images, videos, backups)
File    → Cloud network drive (SMB/NFS)
Queue   → Message passing between app components
Table   → Simple NoSQL structured storage
Disk    → Virtual hard drives for VMs

Access tiers (Blob): Hot → Cool → Cold → Archive (cheapest but slowest)
Redundancy: LRS < ZRS < GRS < GZRS (most protected)

Official References

• Azure Storage overview

• Azure Blob Storage

• Azure Files

• Azure Queue Storage

• Azure Table Storage

• Azure Managed Disks

• Storage redundancy

Next Chapter → Chapter 12: Azure Database Services