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Compare Azure Files and Blob Storage for an application

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  1. Understand the access model
  2. Evaluate protocol and compatibility
  3. Consider data protection and management
  4. Make the decision

You are building an application that needs to store data. The first technical decision is often whether to use Azure Files or Azure Blob storage. This is not just a choice between two storage accounts; it is a choice between two fundamentally different access models. Azure Files provides a network file share accessible via SMB or NFS. Azure Blob storage provides object storage accessible via HTTP/HTTPS.

The decision comes down to how your application interacts with the data. If your application expects a traditional file system with mounted drives, Azure Files is the natural fit. If your application is designed to work with objects, APIs, and distributed access, Blob storage is the correct choice.

Understand the access model

Azure Files is designed to replace or supplement on-premises file servers. It presents a file share that clients can mount using industry-standard protocols. According to the documentation, Azure Files supports the Server Message Block (SMB) protocol and the Network File System (NFS) protocol Introduction to Azure Files.

This matters because many legacy applications, or applications being “lifted and shifted” to the cloud, are written to use standard file system I/O APIs. For example, a Windows application might use System.IO.File to read and write configuration files or logs. With Azure Files, you can mount the share on the client machine, and the application accesses the data as if it were on a local hard drive or a traditional network-attached storage (NAS) device Introduction to Azure Files. This familiarity simplifies migration for applications that cannot be easily rewritten to use REST APIs.

In contrast, Azure Blob storage is Microsoft’s object storage solution. It is optimized for storing massive amounts of unstructured data, such as text or binary data, that does not adhere to a particular data model About Blob (object) storage. Clients access objects in Blob storage via HTTP/HTTPS, the Azure Storage REST API, or client libraries for languages like .NET, Java, Python, and Go About Blob (object) storage.

If your application is a modern web service, a mobile backend, or a data analytics pipeline, it likely already uses HTTP-based APIs to interact with data. In this case, forcing the application to use a file share via SMB or NFS adds unnecessary complexity and latency. Blob storage is designed for this distributed access pattern, allowing clients to access objects from anywhere in the world via HTTP/HTTPS About Blob (object) storage.

Evaluate protocol and compatibility

The protocols supported by each service dictate which clients can access the data and how they interact with it.

Azure Files supports SMB 3.1.1, SMB 3.0, and SMB 2.1, as well as NFS 4.1 Plan for an Azure Files deployment. SMB file shares are accessible from Windows, Linux, and macOS clients. NFS file shares are accessible from Linux clients Introduction to Azure Files. This broad protocol support makes Azure Files suitable for scenarios where multiple operating systems need to access the same data using standard file sharing protocols. For example, you might use Azure Files to store shared application settings or diagnostic logs that are accessed by both Windows and Linux application instances Introduction to Azure Files.

However, SMB has limitations. SMB 3.1.1 and SMB 3.0 support encryption in transit, but SMB 2.1 does not support encryption over the internet. Azure Files only allows SMB 2.1 connections within the same Azure region as the file share Plan for an Azure Files deployment. Additionally, SMB file shares do not support hard links, symbolic links, or alternate data streams Plan for an Azure Files deployment.

Blob storage, on the other hand, is accessed via HTTP/HTTPS. This means it is accessible from any client that can make HTTP requests, including web browsers, mobile apps, and server-side applications. Blob storage also supports the Network File System (NFS) 3.0 protocol for mounting containers, and SSH File Transfer Protocol (SFTP) for secure file transfers About Blob (object) storage. This makes Blob storage a versatile option for scenarios where you need to provide secure file transfer capabilities or mount containers as file systems for specific workloads.

Consider data protection and management

Both services offer robust data protection features, but they are managed differently.

Azure Files supports soft delete for file shares, which allows you to recover deleted shares within a configurable retention period Plan for an Azure Files deployment. It also supports snapshots, which are read-only, point-in-time copies of a share. You can have up to 200 snapshots per file share and retain them for up to 10 years Plan for an Azure Files deployment. Azure Backup can be used to manage snapshots and provide grandfather-father-son (GFS) retention policies Plan for an Azure Files deployment.

Blob storage also supports soft delete for blobs and containers, as well as versioning for blobs. Versioning allows you to keep multiple versions of a blob, which is useful for recovering from accidental overwrites or deletions. Blob storage also supports immutability policies, which can be used to comply with regulatory requirements for data retention.

When it comes to management, Azure Files is managed as a file share within a storage account. You can create multiple file shares within a single storage account, and they share the storage account’s limits Plan for an Azure Files deployment. Blob storage is managed as a container within a storage account. You can create multiple containers within a single storage account, and they share the storage account’s limits About Blob (object) storage.

Make the decision

The choice between Azure Files and Blob storage depends on your application’s requirements.

Choose Azure Files if:

  • Your application expects a traditional file system with mounted drives.
  • You need to support SMB or NFS protocols for client access.
  • You are lifting and shifting an application that uses standard file system I/O APIs.
  • You need to share data across multiple machines, applications, or application instances using a file system interface Introduction to Azure Files.

Choose Blob storage if:

  • Your application is designed to work with objects and APIs.
  • You need to store massive amounts of unstructured data.
  • You need to access data from anywhere in the world via HTTP/HTTPS.
  • You need to integrate with data analytics services or provide secure file transfer capabilities About Blob (object) storage.

For example, if you are building a new cloud-native application that needs to store user-uploaded images, Blob storage is the better choice. You can access the images via HTTP/HTTPS, and you can use Azure CDN to distribute them globally. If you are migrating a legacy Windows application that stores configuration files in a shared network drive, Azure Files is the better choice. You can mount the share on the application servers, and the application can access the files using standard file system APIs.

Verify your choice by reviewing your application’s data access patterns. If the application uses file system APIs, Azure Files is likely the right choice. If the application uses HTTP-based APIs, Blob storage is likely the right choice. If you are unsure, consider prototyping both approaches and measuring the performance and compatibility of each.

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