magic pocket's tech lead (disclaimer: my cofounder at convex) has a whole talk on this concept of "durability theater" [1]!
the tldr is that those numbers of 9s are just table stakes. no system should ever lose data due to routine disk failures. so then, as you mention, there's another whole art to mitigating those other sources of problems.
the tldr is that those numbers of 9s are just table stakes. no system should ever lose data due to routine disk failures. so then, as you mention, there's another whole art to mitigating those other sources of problems.
[1] https://www.facebook.com/atscaleevents/videos/17416916227706...