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> What am I missing?

My guess is that they cheaped out in having redundant PSUs to get you to use multiple availability zones. (More zones = more revenue)

Even a single PSU shouldn’t be an issue if they plugged in an ATS switch though.

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Unless the ATS breaks, which happens.

Yup. I'm still upset (but not angry) about https://status.linode.com/incidents/kqhypy8v5cm8.

For sure, in my context I meant a ATS in single rack/cabinet. If that went bad the blast radius would be contained to a single cabinet. But yeah, anything can and will happen. At another place I worked at, a site UPS took down an entire server room. It was pretty nice Eaton system but there was some event that fried the whole thing. Eaton had to send an specialist to investigate the matter as those events are pretty rare.

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