Hi, thank you for your work on this and being willing to answer questions on it.
"We guarantee durability via replication". I've starting noticing this pattern more where distributed systems provide durability by replicating data rather than writing it to disk and achieving the best of both worlds. I'm curious
1. Is there a name for this technique?
2. How do you calculate your availability? This blog post[1] has some rough details but I'd love to see the math.
3. I'm guessing a key part of this is putting the replicas in different AZs and assuming failures aren't correlated so you can multiply the probabilities directly. How do you validate that failures across AZs are statistically independent?
"We guarantee durability via replication". I've starting noticing this pattern more where distributed systems provide durability by replicating data rather than writing it to disk and achieving the best of both worlds. I'm curious
1. Is there a name for this technique?
2. How do you calculate your availability? This blog post[1] has some rough details but I'd love to see the math.
3. I'm guessing a key part of this is putting the replicas in different AZs and assuming failures aren't correlated so you can multiply the probabilities directly. How do you validate that failures across AZs are statistically independent?
Thanks!
[1] https://planetscale.com/blog/planetscale-metal-theres-no-rep...