Comment by cyberax
12 hours ago
That's actually true. AWS is designed to survive one datacenter being offline (which happened more than once, btw). When the first DC in ME was hit, AWS continued working normally, with only a few services experiencing issues.
But it's not designed to survive TWO datacenters going offline, and in a permanent fashion.
That's fair. The only reference was about one datacenter blowing up. You can't have unlimited redundancy.
Aren't they supposed to have 3 copies of everything? If so, two datacenters going offline at the same time should mean almost zero data loss.
No.
_You_ are supposed to have three copies of everything - and two of those should be off AWS.
Yeah yeah I know about 3-2-1.
But when I put data on normal S3, isn't my money supposedly paying for triple redundancy?
Look, here's the documentation: https://docs.aws.amazon.com/AmazonS3/latest/userguide/DataDu...
"S3 Standard, S3 Intelligent-Tiering, S3 Standard-IA, S3 Glacier Instant Retrieval, S3 Glacier Flexible Retrieval, and S3 Glacier Deep Archive redundantly store objects on multiple devices across a minimum of three Availability Zones in an AWS Region. An Availability Zone is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region."
As far as I've heard before that's not with parity and three zones means three copies. But when I search now I see things about 5+4 parity, any insight here?