Slashdot Mirror
Uptime Realities in the Internet World
schnurble writes: "My former boss has written an interesting article on the realities of uptime in the Internet World. It poses the idea that four and five nines of reliability are too expensive to be realistic, especially in the post dot-bomb economy. It's an interesting read, especially if you answer to an 800lb gorilla for outages and uptime issues."
Uptime Realities in the Slashdot-linked World
There is no longer anything that can be done with computers that is nontrivial and clearly legal. -- Paul Phillips
uptime.netcraft.com Is THE best place to see what works for uptime. Last time I checked BSD machines were the best for uptime.
:o)
M@t
Matt Thompson - Actuality - Insert product here.
And for the follow up article he discusses how hard it is for a site to remain up after it's been slashdotted.
First off, there's 8766 hrs/yr (assuming 365.25 days/year), not 8544.
As for percentages:
- 90% uptime: Down 876.6 hours, or 36.525 days. 3 days per month.
- 99% uptime: 87.66 hours, or 3.65 days.
- 99.9% uptime: 8.77 hours
- 99.99% uptime: 0.877 hours, or 52.6 minutes
- 99.999% (5 nine's!) uptime: 0.0877 hours, or 5.26 minutes
- 99.9999% uptime: 0.0088 hours, or 0.526 min, or 31.56 seconds
- 99.99999% uptime: 0.0526 min, or ~3 seconds
- 99.999999% uptime: ~1/3 second outage per year
I suspect that most people could figure out the mystical, magical mathematic relations after the 90% to 99% jump....365 days * 24 hours * 60 minutes * 60 seconds = 31536000 seconds/year
Now, per year, that means that...
90.00000% uptime - Downtime: 36 days, 12 hours
99.00000% uptime - Downtime: 3 days, 15 hours, 36 minutes
99.90000% uptime - Downtime: 8 hours, 45 minutes, 36 seconds
99.99000% uptime - Downtime: 52mins, 33 secs
99.99900% uptime - Downtime: 5 mins, 15 secs
99.99990% uptime - Downtime: 32 secs
99.99999% uptime - Downtime: 3 secs