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Azure Disk Storage in Azure

In this article we will learn about Azure Disk storage account in azure.

       Azure managed disks are block-level storage volumes that are managed by Azure and used with Azure Virtual Machines.

       Managed disks are like a physical disk in an on-premises server but, virtualized.

For creating a managed disk, all you have to do is specify the disk size, the disk type, and provision the disk.

Once you provision the disk, Azure handles the rest.

Types of the Disk

Ø  Unmanaged Disk

It is a traditional type of disk that has been used by VMs. With these disks, we can create our storage account and specify that storage account when we create the disk. We must not put too many disks in the same storage account, resulting in the VMs being throttled.

Ø  Managed disks:

It handles the storage account creation/management in the background for us and ensures that we do not have to worry about the scalability limits of the storage account. We specify the disk size and the performance tier (standard/premium), and Azure creates and manages the disk for us.

Ultra Disk :- IO-intensive workloads such as SAP HANA, top tier databases (for example, SQL, Oracle), and other transaction-heavy workloads.

Standard HDD disks: It delivers cost-effective storage. It can be replicated locally in one data-center, or be geo-redundant with primary and secondary data centers.

Standard SDD disks: It is designed to address the same kind of workloads as standard HDD disks, but offer more consistent performance and reliability than HDD. It is suitable for applications like web servers that do not need high IOPS on disks.

Premium SSD disks: It is backed by SSDs, and delivers high-performance, low-latency disk support for VMs running I/O-intensive workloads. The premium SSD disks are mainly used for production and database servers. So if we are hosting a database in a particular server, then the premium SSD will be a good option.


Disk type comparison

 The following table provides a comparison of the four disk types to help you decide which to use.

Ultra diskPremium SSDStandard SSDStandard HDD
ScenarioIO-intensive workloads such as SAP HANA, top tier databases (for example, SQL, Oracle), and other transaction-heavy workloads.Production and performance sensitive workloadsWeb servers, lightly used enterprise applications and dev/testBackup, non-critical, infrequent access
Max disk size65,536 gibibyte (GiB)32,767 GiB32,767 GiB32,767 GiB
Max throughput4,000 MB/s900 MB/s750 MB/s500 MB/s
Max IOPS160,00020,0006,0002,000

benefits of using managed disks.

Highly durable and available

Ø  managed disks are designed for 99.999% availability

Ø  Managed disks achieve this by providing you with three replicas of your data, allowing for high durability.

Ø  This type of durability protects you from not only one, but two failures of disk replicas.

Simple and scalable VM deployment

Ø  Using managed disks, you can create up to 50,000 VM disks of a type in a subscription per region,

Ø  This allows you to create thousands of virtual machines in one subscription.

Ø  you can create VM scale sets that include up to 1000 VMs per set, provided you use a marketplace image.


Integration with availability sets

Ø  managed disks are integrated with both availability sets and availability zones.

Ø  The integration with availability sets ensures that VM disks within an availability set are isolated from one another.

Ø  This protects your applications from a single point of failure within an Azure datacenter.

Ø  Availability zone integration protects applications from entire Azure datacenter failures.


Azure Backup support

Ø  Since Azure backup supports the backup and restore of managed disks, you can use Azure backup to create backup jobs to protect your data.

Ø  This makes VM restores a snap.

Ø  Currently Azure Backup supports disk sizes up to 32 tebibyte (TiB) disks.


Granular access control

Ø  Using Azure role-based access control, or RBAC, you can specify granular access control for managed disks.

Ø  you can assign specific permissions for managed disks to your users.


Upload your vhd

Ø  Azure managed disks make it easier to upload your on-prem VMs to Azure because you can use direct upload to transfer your VHD files to Azure managed disks.

Ø  You can use direct upload to upload vhds up to 32 TiB in size.


disk roles in Azure

There are three disk roles in Azure. These roles include data disks, OS disks, and temporary disks.

Ø  Data disk

Ø  OS disk

Ø  temporary disk


Data disk

Ø  A data disk is a managed disk that's attached to a virtual machine to store application data, or other data you need to keep. 

Ø  When you attach a data disk to a VM, it's registered as a SCSI drive.

Ø  You can assign a drive letter to a data disk just like any other physical disk in a physical server. 

Ø  Data disks have a max capacity of 32 terabytes, and the number of data disks that you can attach to a virtual machine will be determined by the size of the virtual machine itself.

OS disk

Ø  Every virtual machine has one attached operating system disk. That OS disk has a pre-installed OS, which was selected when the VM was created.

Ø  This disk contains the boot volume.

Ø  The max capacity of an OS disk is four terabytes.


Temporary disk


Ø  Most VMs contain a temporary disk, which is not a managed disk.

Ø  It is associated with the virtual machine that will be located in the underlying hardware from where the server is provisioned.

Ø  So, the temporary disk will not be stored in a storage account.

Ø  It will be stored in the underlying hardware from where this server is located.

  You can learn more on it from below link

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