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  2. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    Downtime per year [note 1] Downtime per quarter Downtime per month Downtime per week Downtime per day (24 hours) 90% ("one nine") 36.53 days 9.13 days 73.05 hours 16.80 hours 2.40 hours 95% ("one nine five") 18.26 days 4.56 days 36.53 hours 8.40 hours 1.20 hours 97% ("one nine seven") 10.96 days 2.74 days 21.92 hours 5.04 hours 43.20 minutes

  3. Five nines - Wikipedia

    en.wikipedia.org/wiki/Five_nines

    High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of downtime per year Nine (purity) , a 99.999% pure substance German 15 cm (5.9 in) artillery shells used in World War I

  4. Microsoft Azure - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Azure

    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.

  5. Uptime - Wikipedia

    en.wikipedia.org/wiki/Uptime

    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.

  6. Nines (notation) - Wikipedia

    en.wikipedia.org/wiki/Nines_(notation)

    1 troy ounce of four nines fine gold (999.9) Nines are an informal logarithmic notation for proportions very near to one or, equivalently, percentages very near 100%. Put simply, "nines" are the number of consecutive nines in a percentage such as 99% (two nines) [1] or a decimal fraction such as 0.999 (three nines).