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Why Azure recommends to run at least 2 instances of cloud service roles?

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If you only have your deployment set up to run 1 instance, you'll only get 1 instance. You won't get a VIP-swap. During Guest OS (or Host OS) update, your service will be offline for a short period of time (there's no single-instance SLA). Note: If you have two or more instances, then indidiual instances are updated one at a time (or in groups) based on how many update domains you have. During this period, traffic is still round-robin'd to the remaining instances. Then, with your new instance up, it will start receiving traffic while another gets taken down. And so on.

Also: Guest OS images are updated ~monthly, not weekly. It's possible you'll see an occasional reboot for various reasons, but not from weekly Guest OS rollouts.

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