An Azure service that is used to provision Windows and Linux virtual machines.
Hi @Handian Sudianto ,
it is possible to upgrade a VM in reservation mode (VM reserved instances).
As long as the new VM SKU is in the same VM SKU series (instance size flexibility group) the existing VM reserved instances will be applied.
More details and how the size flexibility of VM reserved instances is working you can find here: Virtual machine size flexibility with Reserved VM Instances
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Regards
Andreas Baumgarten