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What's the actual number of 9s for the major cloud services these days? My impression from their PR seems to mismatch the number of outages and issues lately.
by hnaccy 7y ago
What's the actual number of 9s for the major cloud services these days?
My impression from their PR seems to mismatch the number of outages and issues lately.
- zzzcpan 7y agoI don't think there is any mismatch, it was always three nines. I guess the only mismatch is in claims that three nines is enough to not be noticeable or annoying to people.
- Johnny555 7y agoAWS EC2 promises 4 9's (4.3 minutes of downtime/month) before their SLA kicks in, but they only give a 10% discount until availability dips below 99% (7.5 hours of downtime/month) when they give a 30% discount. If availability is below 95% (36 hours) in a month, they give a full refund. For an individual instance, they only promise 90% availability.
- user5994461 7y agoAvailability of what? I've noticed entire afternoon where it wasn't possible to provision instances of some types, when I was working with AWS daily.
- Johnny555 7y agoAvailability of running instances, I don't think they make any guarantees for availability unreserved on-demand instances (I don't see how they could).
- sudosteph 7y agoAvailability of network access to existing instances. What you're talking about with provisioning capacity is a totally different matter. Provisioning availability is not guaranteed (unless you purchase reserved instances) and there are frequently periods where certain instance types are not available in certain AZs, though they do try to resolve that as fast as practicality allows them to. It really stinks sometimes though - especially if you get into a situation where something fails in your autoscaling group and there is no capacity available for a replacement instance. Usually you can get around that though by making sure your ASG is set up for multiple AZs, or worst case changing instance types (though that can be problematic in it's own way). source: I used to work for AWS Support.
- sofaofthedamned 7y agoYeah, you can now provision multiple instance types in an ASG which mitigates this somewhat. I think people sometimes forget that the cloud isn't magic, and a sudden burst of requests for new instances needs somebody to actually rack up some servers.
- itslennysfault 7y agoWhat a craptactular SLA.
- Johnny555 7y agoIs there any cloud provider with a better SLA? Google's is similar, but only gives a 50% credit if the service has less than 95% availability.
- LoSboccacc 7y agoI don't think that thinking about cloud computing in terms of nines is the correct way to frame the issue. cloud storage, maybe, but cloud gives you the cheap bricks you need to build the nines for your customers using replication, independent zones and clever routing. now I wouldn't go as far as to say outages are the normal state of thing, but cloud trades high nines for cheap redundancy. a raid for compute, if you will, and as such a single zone deployment is going to have outages. (and then there's soft layer which has multiple unplanned sev1 per week)
- StreamBright 7y agoDepending on which metric you are talking about. There roughly 10 metrics you might be thinking of.
- nabla9 7y agoI think Google has 99.5% in most of their services. Due to network failures etc. number visible to customers is unlikely to be going to be much higher than that in cloud services.