Google famously ran on commodity hardware. They likely still do (although today's commodity is different than 15-20 years ago). If a piece fails, you just swap

Google famously ran on commodity hardware. They likely still do (although today's commodity is different than 15-20 years ago). If a piece fails, you just swap in a new piece. Of course, there are lots of pieces, many interconnections, and many different failure modes. Some may be repairable, but you won't be repairing a HDD platter (if you're even using them), you'll just replace it with a functional piece and (hopefully) recycle the bad piece.