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Here are the hardware/software recommendations for running Tableau Server:
You want to make sure you have at least the recommended amounts - these are needed for a production instance of Tableau Server to run as intended:
Free Disk Space
8-core, 2.0 GHz or higher
I'd read through the Administrator Guide before starting any installation, it covers your questions and quite a few other important points:
The specs above should be sufficient for your environment, but if you're looking for specific guidance on sizing, your customer would want to engage Tableau Services for assistance.