thats for below 99.9% - they are at 99.997% .. you are never getting that 10% cr...

christop · on Feb 28, 2017

0.1% of 28 days is 40 minutes, so it seems likely to happen.

_vafj · on March 1, 2017

I was calculating it for a year - maybe the availability applies to per billing cycle - you may be correct..

joatmon-snoo · on Feb 28, 2017

You got your orders of magnitude wrong ;)

    99.9964583 = 100 - 153/(30*24*60)
    99.6458333 = 100 * (1 - 153/(30*24*60))

_vafj · on March 1, 2017

I was calculating it for a year - maybe the availability applies to per billing cycle.. I am still not able to understand your math - mind explaining

joatmon-snoo · on March 1, 2017

Your numbers are still off for a year.

    99.9997089 = 100 - 153/(365*24*60)
    99.9708904 = 100 - 100*153/(365*24*60)

The formula is 100% minus 100% times downtime/time in month/year.

153 is the number of minutes they were down going off the reported updates at https://status.aws.amazon.com/ - 11:35AM PST was when they fixed the status page, 2:08PM PST was when S3 was fully back online. (And 153 is underestimating it, because there were errors going on for long before they fixed the status page, but I don't have timestamps on that.)