This weekend there was a solar CME warning that finally had no perceptible impact. However, I was wondering what could be done to mitigate the effects in case a large one took place. Are there any devices available in the market to protect servers from the pernicious electromagnetic effects (or help paliate them in some way)? (Like for example, an special power source or cage)
I'm not thinking on protecting a large server farm, but perhaps one or two critical machines.
Actually there are RF/EMI shielded racks on the market, what I don't know is if they could withstand a solar flare. Also, critical server rooms can be built as a Faraday cage as one of the answers pointed. It would be interesting to know the percentage of server rooms that are built with this in mind.