Selecting Vm's in west2 region - b8ms not available

Question

Selecting Vm's in west2 region - b8ms not available

pierre shiraziefard 165

Hello,

I am trying to create a reservation in west region (zone1,2,3) and the B8ms is not available in reservation yet I can create it manually without the reservation? additionally Standard B4as v2 is not available in my current west 2 zone 3 yet I have 2 vm's there already and on a shared scope. can I create additional vm's on the same shared scope tied to this reservation?

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Answer 1

Hi, there are two different checks here: whether a size is offered for new deployments in the region, and whether your subscription currently has capacity/quota for it. Since B-series availability changes as generations retire, verify with az vm list-skus --location westus2 --size Standard_B --all and inspect the restrictions field. A reservation does not guarantee that a retired or capacity-constrained SKU can be newly allocated. For replacement, compare B8as_v2/B8als_v2 or a D-series size based on memory, CPU credits, disk and network limits—not only vCPU count. If the required replacement is listed but restricted, request regional vCPU quota or open a capacity support case before purchasing a reservation.

Answer 2

TP 163.4K Volunteer Moderator

Hi,

You can no longer purchase reservation for B8ms since it is scheduled to retire in 2028. Please see below article:

Azure Reserved VM Instances for select VM series will no longer be available starting July 1, 2026

https://techcommunity.microsoft.com/blog/azurecompute/azure-reserved-vm-instances-for-select-vm-series-will-no-longer-be-available-sta/4516505

In regards to purchasing Standard_B4as_v2, you should be able to do this. I just tested and it came up as an option for West US 2. Can you provide more details as to what you are seeing? Below is what I see:

User's image

Thanks.

-TP

pierre shiraziefard 165 Reputation points

2026-07-13T22:34:53.82+00:00

yes, I can purchase the reservation for Standard_B4as_v2, yet in the region & zone I do not see an option to start a vm with Standard_B4as_v2, only standard b4 or b8 is available no Standard_B4as_v2,
pierre shiraziefard 165 Reputation points

2026-07-13T22:35:43.2566667+00:00

yet its only showing me the older b4 or b8 vm's... does not make sense
TP 163.4K Reputation points Volunteer Moderator

2026-07-13T22:35:50.7433333+00:00

@pierre shiraziefard Please clarify if you are trying to purchase reservation for Standard_B4as_v2 and are unable or if you are trying to create a Standard_B4as_v2 in Zone 3 and are unable. I re-read your question and I'm unsure which scenario you mean.

Please note it is possible to have existing VMs in a particular Availability Zone and then if you try to create a new VM using same size it could fail due to limited capacity in the zone.
pierre shiraziefard 165 Reputation points

2026-07-13T22:37:20.2133333+00:00
TP 163.4K Reputation points Volunteer Moderator

2026-07-13T22:47:02.59+00:00

Okay, I hadn't read your comments when I posted mine. From your screenshot, please click See all sizes, next in upper right corner change the dropdown to No grouping. There will be a delay of 10+ seconds while it retrieves the sizes and populates the screen.

Once you see the list of sizes, please enter B4a in the search box in upper left corner.
pierre shiraziefard 165 Reputation points

2026-07-13T22:56:55.0533333+00:00

yes, it says not available request quota which means its not available in any of the 3 zones on west 2
pierre shiraziefard 165 Reputation points

2026-07-13T22:58:20.72+00:00

even if I find one, when I create a VM that size is not available for me to match it to my reservation...
pierre shiraziefard 165 Reputation points

2026-07-13T22:59:34.3933333+00:00

can we schedule a screen share for tomorrow 7/14 I am in USA EST time zone, I am available from 9:00 am to 4:00 p.m
TP 163.4K Reputation points Volunteer Moderator

2026-07-13T23:03:13.5766667+00:00

What happens when you click Request quota link, fill out number of cores, etc? Does the automated method get denied? If yes, did you try requesting it via free support ticket?

The new B v2 series are in high demand. You may or may not be able to obtain additional quota, but it is worth a try. Please make the quota request if you haven't already. For example, the other day I wanted B2ats_v2 in East US and automated quota request denied it.
pierre shiraziefard 165 Reputation points

2026-07-13T23:37:48.3933333+00:00

I created a support ticket to increase the limit, we will see. Thanks.