have Azure infrastructure and usage metrics across more than 20 subscriptions. I’ve been asked to perform a TCO analysis for migrating these workloads to GCP.
The challenge is that there is no clear architecture documentation, no complete billing invoices, and only partial information available for only a few subscriptions.
My questions are:
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Is it practical to produce a reliable TCO analysis with this level of information?
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What is the right way to approach this situation?
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How should I estimate the migration timeline to GCP?
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Is it better to request more information, or should I proceed by making reasonable assumptions, mapping Azure services to equivalent GCP services, and estimating GCP costs based on those assumptions?
This is a mid-sized enterprise environment.
Any guidance would be appreciated.