3 ms·

I don't recall seeing Facebook or Google have 15 years of uninterrupted service.

• vidarh 12y ago
  It's an unfair comparison in any case: DNS is "trivial" to keep up compared to even small fractions of Facebook and Google's infrastructure. As long as a sufficient fraction of servers at a sufficient fraction of Verisigns clusters has an uncorrupted set of data and is able to serve responses, Verisigns TLD zones remain up. Pretty much the only thing that can go wrong in that case, assuming you have safeguarded the integrity of the zone is bugs in components outside their direct control. It makes 100% sense for them to focus their efforts on ensuring diversity, because the class of problems that can solve for them makes up an unusually high percentage of the possible failure classes, and the nature of the service also means that most of the potential problems that this can cause is only likely to take out some proportion of their capacity that still leaves them with a functional system, so the potential benefit is higher for them than for most with a heterogeneous, and the potential risks are lower for them than for most. For Google and Facebook, the systems are so much more complex that the tradeoffs are vastly different.
  • feld 12y ago
    It's equally trivial if you serve your web infrastructure off of load balanced caches.
    • vidarh 12y ago
      Sort of (ignoring that web browsers don't retry failed requests), if all you are serving is static/cacheable content. Which excludes the vast majority of functionality of Google/Facebook, and most other major web properties.