What Is Managed Disk in Azure: Simple Explanation and Example

A managed disk in Azure is a storage resource that automatically handles the storage account management for virtual machine disks. It simplifies disk management by taking care of scalability, availability, and durability without requiring you to manage the underlying storage accounts.

How It Works

Think of a managed disk like renting a safe deposit box at a bank. You just ask for the box, and the bank takes care of the security, maintenance, and availability. You don't have to worry about the details behind the scenes.

In Azure, when you create a managed disk, Azure automatically creates and manages the storage accounts needed to hold your disk data. This means you don't have to create or manage storage accounts yourself, which reduces complexity and risk.

Azure also ensures your managed disks are highly available and durable by replicating data and handling backups behind the scenes. This makes your virtual machines more reliable without extra effort from you.

Example

This example shows how to create a managed disk in Azure using Azure CLI. It creates a 128 GB managed disk in the resource group myResourceGroup in the eastus region.

bash

az disk create --resource-group myResourceGroup --name myManagedDisk --size-gb 128 --location eastus --sku Premium_LRS

Output

{
  "creationData": {
    "createOption": "Empty"
  },
  "diskSizeGb": 128,
  "id": "/subscriptions/{subscription-id}/resourceGroups/myResourceGroup/providers/Microsoft.Compute/disks/myManagedDisk",
  "location": "eastus",
  "name": "myManagedDisk",
  "sku": {
    "name": "Premium_LRS"
  },
  "type": "Microsoft.Compute/disks"
}

When to Use

Use managed disks when you want simple, reliable, and scalable storage for your Azure virtual machines without managing storage accounts yourself.

They are ideal for production workloads where high availability and durability are important, such as databases, web servers, and application servers.

Managed disks also support features like snapshots and disk encryption, making them suitable for backup and security needs.

Key Points

• Managed disks remove the need to manage storage accounts for VM disks.
• They provide high availability and durability through replication.
• Support different performance tiers like Standard HDD, Standard SSD, and Premium SSD.
• Enable easy backup with snapshots and disk encryption.

Key Takeaways

Managed disks simplify VM disk storage by handling storage accounts automatically.

They ensure high availability and durability through built-in replication.

Use managed disks for production workloads needing reliable and scalable storage.

Managed disks support snapshots and encryption for backup and security.