Azure磁盘ID中资源组名称大小写不敏感问题咨询

Great question—let’s unpack this behavior you’re seeing with Azure disk resource IDs and resource group name casing.

First, it’s important to clarify a core Azure design detail: Azure resource group names are inherently case-insensitive. Even though you might specify a mixed-case name like diskRG1 when creating resources, Azure treats diskRG1, DISKRG1, and diskrg1 as the exact same resource group behind the scenes.

The discrepancy you’re observing in the disk’s resource ID (where the resource group name shifts from diskRG1 to DISKRG1 after attaching to a VM) is a known, expected behavior rather than a bug. Here’s why it happens:

• When you first create the disk, the resource ID uses the exact casing you provided for the resource group name during creation.
• When you attach the disk to a VM and view it via the Azure Portal’s VM disks page, the portal fetches the disk’s details through a different API path. In some cases, this API returns the resource group name in a standardized casing (often uppercase) instead of preserving the original input casing.

Crucially, this casing difference doesn’t affect the functionality of the disk or the resource group. Both versions of the resource ID (/subscriptions/subscriptionID/resourceGroups/diskRG1/... and /subscriptions/subscriptionID/resourceGroups/DISKRG1/...) will resolve to the same disk resource. If you verify via Azure CLI or PowerShell using commands like az disk show --name TestVM_disk2 --resource-group diskRG1, you’ll likely see the original casing preserved in the output.

This behavior is part of how Azure normalizes resource identifiers across different service endpoints, and it’s not considered a defect. As long as the character sequence (ignoring case) of the resource group name is correct, you won’t encounter any issues with accessing or managing the disk.

内容的提问来源于stack exchange，提问作者Akshata Sampagavi