Resize reserved instance with new sizes

Question

Hi,

I have 2 VM's running as reserved instance with F4s series size, I want to convert them to different size.
would like to know the procedure of it.
as I dont know what was the pricing back then when these F4s instances were purchased, is it safe to say that current pricing listed in azure calculator for F4s is constant if yes, then it would help me to analyze costing difference between my current size and new size more precisely.

Answer 1

Hi @WinTechie ,

the prices of VM SKUs may be different now. It depends, among other things, on the time at which the reservations were purchased.

If you are talking about "resize the VMs": If you choose the same VM series you don't "loose" the existing reserved instances.
Maybe this is helpful: https://learn.microsoft.com/en-us/azure/virtual-machines/reserved-vm-instance-size-flexibility

Otherwise if you don't need the reserved instances you should cancel these:
https://learn.microsoft.com/en-us/azure/cost-management-billing/reservations/exchange-and-refund-azure-reservations

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 2

Hi @Rob Nicholson ,

you current B12ms reserved instance (RI) is covering 12 vCPUs. The B16ms is a 16 vCPU VM SKU.
The reserved instance for B12ms (12 vCPUs) is applied to the B16ms VM / Pricing will be 12vCPUs by RI and additional 4 vCPUs are charged by PAYG.
If you buy another RI for B4ms (4 vCPU) you should be fine and the B16ms is covered by the RIs (1x B12ms and 1x B 4ms).
At least that is described here and my understanding of "virtual machine size flexibility": https://learn.microsoft.com/en-us/azure/virtual-machines/reserved-vm-instance-size-flexibility

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 3

Hi @Jagadeesh J ,

please take a look here: Virtual machine size flexibility with Reserved VM Instances

You will find an explanation and example how the the Reserved VM Instances works within a VM series.

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards Andreas Baumgarten

Answer 4

Can I just clarify this - my client had a B12ms VM on reserved instance for a year. We re-sized mid-term to B16ms. I can still see the existing reservation for b12ms and the discount is still applied. So I assume the uplift in cost between B12ms and B16ms is getting charged under the non-reservation invoice which has gone up. When the reservation reaches full term, I assume we'll be able to buy another reservation at the higher size?

Answer 5

I've the same doubt, what @Rob Nicholson is having. series changes means B to A,D,F ? or within B series we can resize? can anyone elaborate?