Exam AZ-104 topic 1 question 17 discussion

Wrong. You can simply detach a data disk from one VM and attach it to the other VM without stopping either of the VMs.

Stop the VM first so that disk data is not corrupted (if an service is writing data while you detach)

Since the disk in question is a data disk and not the OS disk, you can detach it without needing to stop the VM (option C). If it were the OS disk, you would need to stop the VM first (option A) to safely detach and reattach it. Detaching a data disk can be done while the VM is running, minimizing downtime and ensuring a smoother transition.

Makes perfect sense that also lab does allows you to detach the disk while VM is running.

The key term is data disk. You can detach a data disk, but can't detach an OS disk while running

c is good answer

ere's the correct sequence: ✅ Stop (deallocate) the VM the data disk is currently attached to (Option A). ✅ Then, detach the disk (Option C). ✅ Attach the disk to the other VM. ✅ Start the VMs as needed. So while Option C is a required step, it can't be the first step — you have to stop the VM first.

The question didn't specify whether the data disk is used for OS so since it can be an external attachable data disk, it can be detached without the need to shutdown the VM.

To ensure that the virtual machines are offline for the least amount of time possible, the first action you should take is to stop the VM that includes the data disk. This will allow you to safely detach the data disk and then attach it to the other Azure VM. Here are the steps you should follow: Stop the VM that includes the data disk: This ensures that the data disk can be safely detached without any data corruption. Detach the data disk: Once the VM is stopped, you can detach the data disk from the VM. Attach the data disk to the other VM: After detaching, you can attach the data disk to the target VM. Start both VMs: Finally, start both VMs to bring them back online.

A. Stop the VM that includes the data disk. Azure does not allow detaching a data disk from a running VM. You must first stop the VM to detach the disk safely.

C is the correct option. I tried to detach the data disk from VM1 to VM2 without shutting down either of them. The only thing you need to consider is that while you detach the data disk, you need to ensure that the data disk is not being used by any service or operation.

De-attach the data disk from the current VM: To attach a data disk from one Azure VM to another, you must first detach the disk from the current VM. The disk must not be in use by the original VM when it is being attached to a different VM. This process can be done without shutting down the VM itself, minimizing downtime.

Segundo o Copilot: Você Você tem uma máquina virtual (VM) do Azure que tem um único disco de dados. Você foi encarregado de anexar esse disco de dados a outra VM do Azure. Você precisa ter certeza de que sua estratégia permite que as máquinas virtuais fiquem offline pelo menor tempo possível. Qual das seguintes é a ação que você deve tomar PRIMEIRO? A. Pare a VM que inclui o disco de dados. B. Pare a VM à qual o disco de dados deve ser conectado. C. Retire o disco de dados. D. Exclua a VM que inclui o disco de dados. Copilot A. Pare a VM que inclui o disco de dados. Primeiro, pare a VM que atualmente possui o disco de dados para desconectá-lo com segurança. Isso minimizará o tempo de inatividade das VMs.

To ensure the virtual machines are offline for the least amount of time possible, the first action you should take is to stop the VM that includes the data disk (Option A). This step is necessary to safely detach the data disk without risking data corruption1.

Answer is A since the strategy allows for the virtual machines to be offline for the least amount of time possible

Just tested this in my lab. C is the correct answer: you will need to detach the disk before you can add it to another vm

I made a experiment: 2 VM`s in one region in 2 zones (zone 1 and zone 2). And i can say thats you dont need to turn off virtual machine at all! Create a disk in 1 VM, attach. Now you can see that you can attach Disk on VM when its on. Deattach and you gonna see that`s you dont need to turn off VM to do it. Make snapshot of disk, after that do a new disk that gonna take data from snapshot and make it in 2 zone (or in zone 1 if you deattach from VM in zone 2). After creating go to VM2 disk and attach a new disk. You can do it without turning off VM2. And thats a miracle! Disk2 has been attached! So answer C is complitely correct. If you don`t trust my try it by yourself and you will see