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Suresh_Godaba's avatar
Suresh_Godaba
Copper Contributor
Sep 29, 2020

Azure Storage

Hi Team,   Can any one, please provide me a brief about Unmanaged vs Managed disks, and which is the best option for real time, obviously its managed. But want brief about these 2.    
Command0r's avatar
Command0r
Iron Contributor
Sep 30, 2020

Suresh_Godaba 

I'd like to highlight the following:

  1. Simple and scalable VM deployment: Managed Disks will allow you to create up to 50,000 VM disks in a subscription, which will enable you to create thousands of VMs in a single subscription.

  2. Better reliability for Availability Sets: Managed Disks provides better reliability for Availability Sets by ensuring that the disks of VMs in an Availability Set are sufficiently isolated from each other to avoid single points of failure.

  3. Highly durable and available (99.999%).

  4. Granular access control: You can use Azure Role-Based Access Control (RBAC) to assign specific permissions for a managed disk to one or more users. Managed Disks exposes a variety of operations, including read, write (create/update), delete, and retrieving a shared access signature (SAS) URI for the disk.

  5. Azure Backup service support: Use Azure Backup service with Managed Disks to create a backup job with time-based backups, easy VM restoration and backup retention policies.

  6. Supported: Yes, unmanaged disks are still supported. We recommend that you use managed disks for new workloads and migrate your current workloads to managed disks (as underlined in the official note).

All above is taken mostly from here: https://docs.microsoft.com/en-us/azure/virtual-machines/managed-disks-overview

 

Now, the bottom line of this highlight is that the unmanaged disks are obsolete. If the memory serves me well, you couldn't even encrypt those disks, so you had to upgrade to managed ones. These days, you create the new workloads (VMs) using managed disks only.

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