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High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization.
Availability is usually expressed as a percentage of uptime in a given year: Availability Downtime per year 99.9% 8.76 hours 99.99% 1 hour 99.999% 5 minutes
Uptime is a measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available. Uptime is the opposite of downtime. Htop adds an exclamation mark when uptime is longer than 100 days.
In this context, a "one nine" (90%) uptime indicates a system that is available 90% of the time or, as is more commonly described, unavailable 10% of the time – about 72 hours per month. [8] A "five nines" (99.999%) uptime describes a system that is unavailable for at most 26 seconds per month. [8]
Website monitoring can be done from both inside and outside of a corporate firewall.Traditional network management solutions focus on inside the firewall monitoring, whereas external performance monitoring will test and monitor performance issues across the Internet backbone and in some cases all the way to the end-user.
The 15 minutes rules for on time performance is commonly applied throughout the airline industry. [3] Airlines typically perform well when their on time performance reaches 90%. [ 4 ] OAG and Cirium regularly publish airline on time performance rankings and data.
In the mid-1960s, to defeat the advantage of the recently introduced computers for the then popular rally racing in the Midwest, competition lag times in a few events were given in centids (1 ⁄ 100 day, 864 seconds, 14.4 minutes), millids (1 ⁄ 1,000 day, 86.4 seconds), and centims (1 ⁄ 100 minute, 0.6 seconds) the latter two looking and ...
A press release posted on Google's Official Enterprise Blog assured businesses that Google would encrypt data stored on its servers, as well as information being transmitted to or from them. Google delivers 24/7 phone support to business users and has guaranteed 99.9% uptime for its servers. [108]