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A simple mnemonic rule states that 5 nines allows approximately 5 minutes of downtime per year. Variants can be derived by multiplying or dividing by 10: 4 nines is 50 minutes and 3 nines is 500 minutes. In the opposite direction, 6 nines is 0.5 minutes (30 sec) and 7 nines is 3 seconds.
Downtime per year 90% 1 nine 876 hours 95% – 438 hours 99% 2 nines 87 hours, 36 minutes 99.9% 3 nines 8 hours, 45 minutes, 36 seconds 99.99% 4 nines 52 minutes, 33.6 seconds 99.999% 5 nines 5 minutes, 15.36 seconds 99.9999% 6 nines 31.68 seconds
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]
Microsoft Azure uses large-scale virtualization at Microsoft data centers worldwide and offers more than 600 services. [11] Microsoft Azure offers a service level agreement (SLA) that guarantees 99.9% availability for applications and data hosted on its platform, subject to specific terms and conditions outlined in the SLA documentation.
Uptime is the opposite of downtime. Htop adds an exclamation mark when uptime is longer than 100 days. It is often used as a measure of computer operating system reliability or stability, in that this time represents the time a computer can be left unattended without crashing or needing to be rebooted for administrative or maintenance purposes.
For an approximately normal data set, the values within one standard deviation of the mean account for about 68% of the set; while within two standard deviations account for about 95%; and within three standard deviations account for about 99.7%.
WNEW-FM regularly programmed traffic reports and weather every five minutes between 5 am and 7 pm on the ones and sixes weekdays, and every ten minutes on the ones (six times an hour) the rest of the week (both from CBS local affiliate television station WUSA, Channel 9), sports updates twice an hour at :25 and :55 from sister all-sports ...
WBTZ (99.9 MHz "99.9 The Buzz") is a commercial FM radio station in Plattsburgh, New York, and serving the Plattsburgh area, the Burlington, Vermont metropolitan area and Greater Montreal.