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> An Availability Zone is one or more discrete data centers with separate and redundant power infrastructure, networking, and connectivity in an AWS Region. Ava
by paulddraper 15d ago
> An Availability Zone is one or more discrete data centers with separate and redundant power infrastructure, networking, and connectivity in an AWS Region. Availability Zones in a Region are meaningfully distant from each other, up to 60 miles (~100 km) to prevent correlated failures, but close enough to use synchronous replication with single-digit millisecond latency.
> https://docs.aws.amazon.com/whitepapers/latest/aws-fault-isolation-boundaries/availability-zones.html https://docs.aws.amazon.com/whitepapers/latest/aws-fault-iso...
They are far enough apart that tornados, floods, and fires cannot simultaneously impact multiple.
- Game_Ender 15d ago10s of miles is close enough that they are functionally in the same place in a military context though. The latest cheap massive wave attack drones fly hundreds of miles and hour which puts the DCs less than a minute apart by flight time. This means if you want protection against those risks you have to use multiple regions instead of, or in addition to multiple AZs.
- paulddraper 15d agoA targeted, coordinated attack can compromise multiple AZs. But AFAIK AWS has only reported data loss in mec1-az2. Cross-AZ services like S3 should have no data loss, unless there is more damage than AWS has currently published.
- deleted 15d ago[deleted]
- TeMPOraL 15d agoElsewhere in this threat comments mention AZ turning out in practice to be different areas of the same building, or just a matter of opinion and some config.
- throwaway173738 14d agoYeah that’s true of Azure and of GCP but not AWS. Azure clearly states this in their documentation. Nobody was trying to hide it from you.