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For example, electricity that is delivered without interruptions (blackouts, brownouts or surges) 99.999% of the time would have 5 nines reliability, or class five. [10] In particular, the term is used in connection with mainframes [ 11 ] [ 12 ] or enterprise computing, often as part of a service-level agreement .
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.
Continuous availability is an approach to computer system and application design that protects users against downtime, whatever the cause and ensures that users remain connected to their documents, data files and business applications.
A chart showing the disparity in income distribution in the United States. [29] [30] Wealth inequality and income inequality have been central concerns among OWS protesters. [31] [32] [33] CBO data shows that in 1980, the top 1% earned 9.1% of all income, while in 2006 they earned 18.8% of all income. [34]
A simple example arises where the quantity to be estimated is the population mean, in which case a natural estimate is the sample mean. Similarly, the sample variance can be used to estimate the population variance. A confidence interval for the true mean can be constructed centered on the sample mean with a width which is a multiple of the ...
Official Chart logo. The UK singles chart (currently titled the Official Singles Chart, with the upper section more commonly known as the Official UK Top 40) [1] is compiled by the Official Charts Company (OCC), on behalf of the British record industry, listing the top-selling singles in the United Kingdom, based upon physical sales, paid-for downloads and streaming.
This was much cheaper than competitors Dropbox and OneDrive offered at the time. [ 59 ] In 2018, the paid plans were re-branded as " Google One " to emphasize their application beyond Google Drive, along with the addition of a $2.99/month plan for 200 GB, and increasing the $9.99 plan to 2 TB at no additional charge.