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Holy crap. It’s an outage in all zones? What’s the point of AZs if you lose whole DCs at a time.
by inlined 7y ago
Holy crap. It’s an outage in all zones? What’s the point of AZs if you lose whole DCs at a time.
- klodolph 7y agoAvailability is hierarchical.
- neonate 7y agoCan you explain that more?
- klodolph 7y agoThere is no service with 100% availability. You put multiple AZs in one region but nobody was ever pretending that regional failures were impossible, just that single-AZ failures are more common than regional failures. You want high availability, you want multi-regional. Above that you want multi-provider. The same decisions that make regions fail also makes infra-region traffic cheaper. This is true for all large cloud providers. If you are okay paying more for internal network traffic you can get multiregional. But multi-AZ is still better than single-AZ. Up to you to decide if it’s worth it. For that you need good SLAs and (IMO) support contracts.
- neonate 7y agoThanks, I understand what you meant now.
- dekhn 7y agoregions are the point. this is known as a "meteor outage".
- MrStonedOne 7y agoOperational Consistency creates a hidden single point of failure
- dragonwriter 7y ago> What’s the point of AZs if you lose whole DCs at a time. The point is that AZs are higher level than DCs, so that they provide pretty decent independence guarantees (though you can further derisk with multi-region.) Well, in AWS. Google's zones have weaker independence assurances (actually, as I read it, no assurances), stating only that a zone “usually has power, cooling, networking, and control planes that are isolated from other zones” [0] as opposed to AWS’s “Availability Zones are physically separated within a typical metropolitan region” and “In addition to discrete uninterruptable power supply (UPS) and onsite backup generation facilities, they are each fed via different grids from independent utilities to further reduce single points of failure. Availability Zones are all redundantly connected to multiple tier-1 transit providers.” [1] [0] https://cloud.google.com/compute/docs/regions-zones/ https://cloud.google.com/compute/docs/regions-zones/ [1] https://docs.aws.amazon.com/whitepapers/latest/aws-overview/global-infrastructure.html https://docs.aws.amazon.com/whitepapers/latest/aws-overview/...