Re:Amazon S3’s 15th Birthday: 5,475 Days and 100T Objects
by tw04 on Monday March 15, 2021 @05:27PM
(#26469318)
>You snipped out the part of the quote that answers your question.
Replicating across two datacenters isn't "really good" though, that's considered table stakes.
>Except, in AWS' case, each AZs (Availability Zones) is made up of upto 8 DCs (Data Centers), and each full-region has at least 3 AZs and 2 Transit Centers. Amazon S3 replicates data to 3 different AZs (which, I am guessing, is in addition to replicating it across DCs in a single AZ for 'eleven 9s').
In AWS' case, the 8 DCs in an AZ are directly adjacent which isn't really useful for anything beyond metro (active/active) availability. I haven't seen a DR plan that doesn't have a hard requirement for the secondary copy of data to be outside of the metro loop/blast radius generally in a different state.
You snipped out the part of the quote that answers your question.
"Most of our customers, if they have on-premises systems—if they're lucky—can store two objects in the same data center, which gives them four 9s. If they're really good, they may have two data centers and actually know how to replicate over two data centers, and that gives them five 9s. But eleven 9's, in terms of durability, is just unparalleled. And it trumps everything."
> I don't know of a single enterprise customer that doesn't have their data replicated to two datacenters...
Except, in AWS' case, each AZs (Availability Zones) is made up of upto 8 DCs (Data Centers), and each full-region has at least 3 AZs and 2 Transit Centers. Amazon S3 replicates data to 3 different AZs (which, I am guessing, is in addition to replicating it across DCs in a single AZ for 'eleven 9s').
With S3 cross-region replication durability may shoot up to 'sixteen 9s'? 100% durability, if it exists, is something the major Cloud providers are yet to offer?
ref: https://maisonbisson.com/post/object-storage-prior-art-and-l...