What Does 99.9% Uptime Mean?

What does 5 nines mean?

From Wikipedia, the free encyclopedia.

Five nines, commonly taken to mean “99.999%”, may refer to: High availability of services, when the downtime is less than 5.26 minutes per year.

Nine (purity), a 99.999% pure substance..

What does 6 nines mean?

Five-nines or 99.999% availability means 5 minutes, 15 seconds or less of downtime in a year. Or, if you are really ambitious, shoot for six nines or 99.9999% availability, which allows 32 seconds or less downtime per year. Otherwise, four nines or 99.99% availability allows 52 minutes, 36 seconds downtime per year.

How much downtime is acceptable?

Most companies strive for 99.9 percent uptime. That equates to 8 hours and 45 minutes of website downtime per year, but by putting certain practices into place you may actually be able to achieve 99.99 percent uptime, which equates to less than an hour of downtime each year.

What is average uptime?

If we step back for a moment to consider the uptime seen with typical industry standard (x86-based) physical systems, 95 percent to 99 percent uptime is a pretty common range. If we look at clustered industry standard systems, the range typically falls between 99.5 percent and 99.9 percent uptime.

How can I get high availability?

Here are some of the key resources you can implement to make high availability possible:Implement multiple application servers. … Scaling and slaves matters. … Spread out physically. … Maintain a recurring online backup system along with hardware. … Use of a virtualized server for zero-downtime recovery.

How many hours is 99.99 uptime?

Percentage calculationAvailability %Downtime per yearDowntime per month99.8%17.53 hours87.66 minutes99.9% (“three nines”)8.77 hours43.83 minutes99.95% (“three and a half nines”)4.38 hours21.92 minutes99.99% (“four nines”)52.60 minutes4.38 minutes12 more rows

What is a good uptime percentage?

Represented as a ratio of the time available divided by the total time, providers calculate the ratio in monthly or yearly increments. Although 100% uptime is the goal, the industry considers 99.999% uptime as high availability.

What does uptime mean?

system reliabilityUptime is a measure of system reliability, expressed as the percentage of time a machine, typically a computer, has been working and available. Uptime is the opposite of downtime.

Is 100 uptime possible?

In a perfect world, 100% uptime can be achieved, but we do not live in a perfect world. As long as the possibility for network failure exists then one can safely say 100% uptime doesn’t exist. That’s not to say that they’re aren’t enough safeguards in place to practically state one operates with 100% uptime.

What is uptime and downtime?

Uptime is a computer industry term for the time during which a computer is operational. Downtime is the time when it isn’t operational. … For example, one standard for uptime that is sometimes discussed is a goal called five 9s – that is, a computer that is operational 99.999 percent of the time.

What are five nines in war?

Definition: Five-Nines are 5.9 inch artillery shells used in WW1. Five-Nines were the most commonly used artillery shell, used by all sides. “Drunk with fatigue; deaf to even the hoots of tired, outstripped Five-Nines that dropped behind.”

How many nines are there?

There are Twenty 9s from 0 to 100. They are in, 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99. You might think that I have Written 19 numbers, but you can see that the number 99 contains two 9s.