Azure – Generate report for unattached Azure disks (managed and un-managed)

When you delete a virtual machine (VM) in Azure, by default, any disks that are attached to the VM aren’t deleted. This feature helps to prevent data loss due to the unintentional deletion of VMs. After a VM is deleted, you will continue to pay for unattached disks.

Unattached MANAGED disks:

When a managed disk is attached to a VM, the ManagedBy property contains the resource ID of the VM. When a managed disk is unattached, the ManagedBy property is null. The script examines all the managed disks in an Azure subscription. When the script locates a managed disk with the ManagedBy property set to null, the script determines that the disk is unattached.

Unattached UN-MANAGED disks:

When an unmanaged disk is attached to a VM, the LeaseStatus property is set to Locked. When an unmanaged disk is unattached, the LeaseStatus property is set to Unlocked. The script examines all the unmanaged disks in all the Azure storage accounts in an Azure subscription. When the script locates an unmanaged disk with a LeaseStatus property set to Unlocked, the script determines that the disk is unattached.

SCRIPT:

Download the script here

PowerShell script to generate a report of unattached VHD disks. This script will create two files – unattached_managed_disks.csv, unattached_un_managed_disks.csv

These two files will contain details about VHD files that are not attached to an Azure virtual machine.

NOTE: You have to login into your account before running the script. “login-azurermaccount” to log in to your account.

You can use the generated CSV to better manage your Azure infrastructure. Understand why the disks are not in use and take an informed decision on whether you want to delete or re-use them. Thus helping you to identify resources that are not being utilized and to reduce cost.

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