> you’ll have to manage to achieve SLAs like Amazon’s? Aaah yes, those AWS SLAs that .... - (a) Famously apply anywhere except US-EAST region which has a

> you’ll have to manage to achieve SLAs like Amazon’s? Aaah yes, those AWS SLAs that .... - (a) Famously apply anywhere except US-EAST region which has a proven tendency to blow itself up on a scheduled basis - (b) Are more marketing fluff than reality. A bit like the old Verizon leased-line 100% uptime SLA, nobody sensible who worked in IT believed it, but your boss was paying the Verizon-tax so that Verizon could afford to pay out some hard-dollars when (not if !) the SLA was inevitably breached. I would also invite you to actually go read the AWS SLAs. The famous 11-9's S3 SLA for example[1] ? Barely worth the paper it is written on. The S3 SLA is silent on data integrity or any other data metric. It only covers you for 500's returned by the AWS S3 API, the "Error Rate": "Error Rate” means, for each request type to an Amazon S3 storage class: (i) the total number of internal server errors returned by Amazon S3 for such request type to the applicable Amazon S3 storage class as error status “InternalError” or “ServiceUnavailable” divided by (ii) the total number of requests for such request type during the applicable 5-minute interval of the monthly billing cycle. We will calculate the Error Rate for each AWS account as a percentage for each 5-minute interval in the monthly billing cycle. Also, its got the world's best get-out clause, the SLA only applies if you actively use the service: "If you did not make any requests in a given 5-minute interval, that interval is assumed to have a 0% Error Rate." So, yeah, give me a break about those "amazing" AWS SLAs. :) Also what happens if AWS breach their over-confident SLAs ? Oh yeah, that's right, typical corporate style hand wringing, an apologetic sounding email written in corporate-speak and approved by legal, and that's that. Maybe a mea-culpa public blog post if you're lucky. Also when you have your own datacentre, you don't have all the stupid nickle and diming of the cloud providers. The major cloud providers are particularly bad about it, all sorts of obscure "hidden" charges just waiting to bite you in the backside if you don't look carefully at the bottom half of their price sheets. [1] https://aws.amazon.com/s3/sla/ https://aws.amazon.com/s3/sla/