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The Azure Storage platform is Microsoft's cloud storage solution for modern data storage scenarios. Core storage services offer a massively scalable object store for data objects, disk storage for Azure virtual machines (VMs), a file system service for the cloud, a messaging store for reliable messaging, and a NoSQL store. The services are:
The Azure Storage platform includes the following data services:
Each service is accessed through a storage account. To get started, see Create a storage account.
The following table compares Files, Blobs, Disks, Queues, and Tables, and shows example scenarios for each.
|Feature||Description||When to use|
|Azure Files||Offers fully managed cloud file shares that you can access from anywhere via the industry standard Server Message Block (SMB) protocol.
You can mount Azure file shares from cloud or on-premises deployments of Windows, Linux, and macOS.
|You want to "lift and shift" an application to the cloud that already uses the native file system APIs to share data between it and other applications running in Azure.
You want to replace or supplement on-premises file servers or NAS devices.
You want to store development and debugging tools that need to be accessed from many virtual machines.
|Azure Blobs||Allows unstructured data to be stored and accessed at a massive scale in block blobs.
Also supports Azure Data Lake Storage Gen2 for enterprise big data analytics solutions.
|You want your application to support streaming and random access scenarios.
You want to be able to access application data from anywhere.
You want to build an enterprise data lake on Azure and perform big data analytics.
|Azure Disks||Allows data to be persistently stored and accessed from an attached virtual hard disk.||You want to "lift and shift" applications that use native file system APIs to read and write data to persistent disks.
You want to store data that is not required to be accessed from outside the virtual machine to which the disk is attached.
|Azure Queues||Allows for asynchronous message queueing between application components.||You want to decouple application components and use asynchronous messaging to communicate between them.
For guidance around when to use Queue storage versus Service Bus queues, see Storage queues and Service Bus queues - compared and contrasted.
|Azure Tables||Allow you to store structured NoSQL data in the cloud, providing a key/attribute store with a schemaless design.||You want to store flexible datasets like user data for web applications, address books, device information, or other types of metadata your service requires.
For guidance around when to use Table storage versus the Azure Cosmos DB Table API, see Developing with Azure Cosmos DB Table API and Azure Table storage.
Azure Blob storage is Microsoft's object storage solution for the cloud. Blob storage is optimized for storing massive amounts of unstructured data, such as text or binary data.
Blob storage is ideal for:
Objects in Blob storage can be accessed from anywhere in the world via HTTP or HTTPS. Users or client applications can access blobs via URLs, the Azure Storage REST API, Azure PowerShell, Azure CLI, or an Azure Storage client library. The storage client libraries are available for multiple languages, including .NET, Java, Node.js, Python, PHP, and Ruby.
For more information about Blob storage, see Introduction to Blob storage.
Azure Files enables you to set up highly available network file shares that can be accessed by using the standard Server Message Block (SMB) protocol. That means that multiple VMs can share the same files with both read and write access. You can also read the files using the REST interface or the storage client libraries.
One thing that distinguishes Azure Files from files on a corporate file share is that you can access the files from anywhere in the world using a URL that points to the file and includes a shared access signature (SAS) token. You can generate SAS tokens; they allow specific access to a private asset for a specific amount of time.
File shares can be used for many common scenarios:
Many on-premises applications use file shares. This feature makes it easier to migrate those applications that share data to Azure. If you mount the file share to the same drive letter that the on-premises application uses, the part of your application that accesses the file share should work with minimal, if any, changes.
Configuration files can be stored on a file share and accessed from multiple VMs. Tools and utilities used by multiple developers in a group can be stored on a file share, ensuring that everybody can find them, and that they use the same version.
Resource logs, metrics, and crash dumps are just three examples of data that can be written to a file share and processed or analyzed later.
For more information about Azure Files, see Introduction to Azure Files.
Some SMB features are not applicable to the cloud. For more information, see Features not supported by the Azure File service.
The Azure Queue service is used to store and retrieve messages. Queue messages can be up to 64 KB in size, and a queue can contain millions of messages. Queues are generally used to store lists of messages to be processed asynchronously.
For example, say you want your customers to be able to upload pictures, and you want to create thumbnails for each picture. You could have your customer wait for you to create the thumbnails while uploading the pictures. An alternative would be to use a queue. When the customer finishes their upload, write a message to the queue. Then have an Azure Function retrieve the message from the queue and create the thumbnails. Each of the parts of this processing can be scaled separately, giving you more control when tuning it for your usage.
For more information about Azure Queues, see Introduction to Queues.
Azure Table storage is now part of Azure Cosmos DB. To see Azure Table storage documentation, see the Azure Table Storage Overview. In addition to the existing Azure Table storage service, there is a new Azure Cosmos DB Table API offering that provides throughput-optimized tables, global distribution, and automatic secondary indexes. To learn more and try out the new premium experience, see Azure Cosmos DB Table API.
For more information about Table storage, see Overview of Azure Table storage.
An Azure managed disk is a virtual hard disk (VHD). You can think of it like a physical disk in an on-premises server but, virtualized. Azure-managed disks are stored as page blobs, which are a random IO storage object in Azure. We call a managed disk 'managed' because it is an abstraction over page blobs, blob containers, and Azure storage accounts. With managed disks, all you have to do is provision the disk, and Azure takes care of the rest.
For more information about managed disks, see Introduction to Azure managed disks.