Managed Disks for VMs in Azure

Let Azure take care of your VM disks!

by | Feb 25, 2017 | Azure IaaS

Introduction

Recently Microsoft introduced managed disks voor VMs in Azure. This great news, especially for those who are holding back from Azure because of the storage model. In the past all disks of a VM were stored on a storage account. That storage account could always be accessed via it’s storage key. There was no option to turn of the storage key; you only could enable rotating storage keys. In this blogpost I will explain how you can enable managed disks for your VMs

Managed Disks

The most easy way to have your VHDs protected is by using managed disks. With private disks, the VHDs are no longer saved in a storage account. Microsoft takes care of the VHDs you are using, and no one else can access them. I think it’s best to deploy all new VM’s with managed disks and migrate existing VM’s to the new storage model. You only want to specify what type of disk you are using (SSD or HDD). In most cases the storage account isn’t interesting at al since you only want a virtual machine.

Enable Managed Disks for New VM’s

Enabling managed disks for new VMs is quite easy to do. When deploying a new VM, the Azure portal is asking for the storage model you want to use. You can select “yes” on the question: “use managed disks” When deploying the VM, azure takes care of the disk.

Convert existing VM for Managed disks

If is possible to convert existing VM’s to the managed disks model. By using the following script, a VM will convert to the managed disk model:

 ## Stop VM
 $rgName = "myResourceGroup"
 $vmName = "myVM"
 Stop-AzureRmVM -ResourceGroupName $rgName -Name $vmName -Force
 
 ## ConvertVM
 ConvertTo-AzureRmVMManagedDisk -ResourceGroupName $rgName -VMName $vmName

Please note that in some cases (especially for Linux VM’s) the conversion isn’t working properly. Always test this kind of conversions before converting productional machines.

 

Managed disk configuration for a new VM

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