Exam AZ-104 topic 4 question 93 discussion

So many people here are making assumptions without actually testing or validating them. The answer is YYY - Tested in Lab. Neither the region, vCPU count, nor the VM generation had any impact on my ability to select a particular VM OS disk as a source for an image version.

NYY image definition needs V1 generation, but vCPU and memory are only recommendations. Text from Azure Portal while creating image definition: "These recommendations are informational only, and do not constrain VM specification"

No, it is not a must to use the OS disk from the source VM in the same region when creating a new VM from a VM image that resides in a different region.however, If you want to reuse the OS disk from the source VM to create a VM in a different region, you'll need to either: Copy the disk to the target region. Create a new image from the OS disk in the source region, then replicate that image to the target region.

After intensive interrogation of ChatGPT I came up with the following conclusions (Please know ChatGPT will not give you the correct answer if you just copy the data to it): There are couple of things that matter here – generation and location. The CPU/memory match is only recommended and if you do not comply Azure may issue a warning or you may observe abnormal behaviour. However, generation and location matters when working with Azure Compute Galleries, virtual machines (VMs), and image definitions. As the “Gallery” is in a separate location from the image, the location of the VM must match the “Image Definition” (East US). So the answers are: VM1 is in different location and generation 2 – NO VM2 is in the same location as the Image Definition and generation 1 – Yes VM3 is generation 1, but the location does not match - NO

1.No 2.Yes 3.No Attaching a disk to another region is not allowed. VMs must be in the same generation 1. Reference: https://learn.microsoft.com/en-us/azure/virtual-machines/faq-for-disks?tabs=azure-portal

I think: NNY 1. version supported is V1 (VM1 is V2) 2. recommended VM CPU 4-16 (VM2 is 2 CPUs) 3. checks all parameters

ChatGPT says No Yes No The operating system disk of VM1 can be used as a source for a version of Image1. No: VM1 is in West Europe, but Image1 is in East US, and the generation (2) is incompatible with Image1's requirement (V1). The operating system disk of VM2 can be used as a source for a version of Image1. Yes: VM2 is in East US, matches the generation requirement (V1), and has sufficient vCPUs (2 falls within the recommended 4-16 range). The operating system disk of VM3 can be used as a source for a version of Image1. No: VM3 is in West US, not East US as required for Image1. Final Answer: No Yes No

WRONG No Yes No

NYY 1. V2 VM, whereas the image definition is for V1. V2 could be used if V2 was specified. 2. V1, so all good. Location doesn't matter. 3. V1, so all good. Location doesn't matter.

Check against vCPU and VM Generation ==recommended vCPU (4-16) and Generation 1 1) VM1 = 8 vCPU; Gen 2 = NO because Gen required is 1; 2) VM2 = 2 vCPU; Gen 1 = NO because vCPU lower than recommended (4-16); 3) VM3= 12 vCPU; Gen 1= YES (vCPU between recommended and Gen 1)

chatgPT4: Statement 1: The operating system disk of VM1 can be used as a source for a version of Image1. VM1 has Generation 2, whereas Image1 requires Generation 1. Therefore, VM1 cannot be used. Statement 2: The operating system disk of VM2 can be used as a source for a version of Image1. VM2 is in the same region (East US) as the image definition and has Generation 1. Therefore, VM2 can be used. Statement 3: The operating system disk of VM3 can be used as a source for a version of Image1. VM3 has Generation 1, but it's located in West US, different from the image definition region (East US). Therefore, VM3 cannot be used.

generation and location is important VM2 ONLY

No Yes No

What is the correct answer?

Tested in my lab as well and mmarkiew is correct. The answer is YYY, the VM generation, vCPU, location etc do not matter. We are just creating a snapshot of that disk as far as I understand it.

to me at the moment: N,N,Y seems like VM generation and location is important to consider. check this YT link. appreciate your thoughts. https://www.youtube.com/watch?v=AWK1GVXdAwI

N-Y-N Box 1- NO: VM gen 2 is not directly supported for image definition with v1. Image & VM source regions doesn't match Box 2 - YES: VM generations matches, along with image & VM source region Box 3 - NO: VM generations matches, but image & VM source region doesn't https://learn.microsoft.com/en-us/azure/virtual-machines/shared-image-galleries?tabs=azure-cli#how-do-i-specify-the-source-region-while-creating-the-image-version