Linux â Getting the Correct Time
Linux ? Getting the Correct Time _uacct = "UA-286605-9"; urchinTracker(); Home About Contact Most Read Articles Our Authors Archive Advertise Author Area Category: Computer Hardware Topics Arts-and-Entertainment Automotive Baby & Child Beauty Blogs Book Reviews Business Career Communications Computer Hardware Computer Software Cooking & Recipes Dating Diet Directories Divorce Domain Names E-Marketing Environment Ezines Family Fashion Fertility Finance Food-and-Drink Forums Frugal Living Health & Healthcare Health-and-Fitness Home Business Home-and-Family Internet Kids & Teens Legal Money Music News-and-Society Pay Per Click Pets Politics Pregnancy & Childbirth Press Releases Product Reviews Real Estate Recreation-and-Sports Reference-and-Education Relationships Religion Sales and Marketing Search Engines Self-Improvement SEO Shopping Site Promotion Taxes Technology Travel-and-Leisure Web Design Web Hosting Webmasters Wedding & Marriage Women Writing & Speaking Linux ? Getting the Correct Time 29th July 2008 Author: Richard N Williams
Ensuring a computer is not only displaying the correct time but that it is being maintained accurately is not as straight-forward as it first sounds.
Most Linux systems have two clocks. The hardware clock, also known as the CMOS of Bios clock, is usually a simple crystal oscillator with battery back-up that maintains time when your system is off or boots up. This clock is usually located on the motherboard and will run all the time, however these clock chips tend to lose time as the computer ages and the battery weakens.
The other clock, the system clock, is a software clock and it starts when you boot up your system often getting an initial time from the hardware clock. System clocks keep time by adding seconds on to a prime epoch, a base time that for Linux and Unix, began at midnight on January 1, 1970.
However, the hardware clock is a cheap electronic oscillator and cannot maintain time to any useful degree of accuracy. They often drift several seconds a day which for day-to-day process is probably adequate but with time sensitive applications it can cause serious problems.
A better way is to set the system clock using the time from a NTP (Network Time Protocol) time server. These dedicated time servers get a UTC (Coordinated Universal Time) time from an atomic clock which are the most accurate time keepers in the world, not losing a second in time in several millions of years.
Dedicated NTP servers use either a radio receiver to pick-up a radio time and frequency broadcast which are transmitted by several national laboratories or by using the timing signal broadcast from the GPS network.
Linux uses a NTP service called NTP Daemon (ntpd). This uses NTP to adjust the system clock for any drift in time as it frequently check the UTC time source.
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about a network time server or other ntp server solutions.
This article is free for republishing
Source: http://www.a1articles.com/article_592240_10.html Occupation: writer Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated time server products. Please visit us for more information about a GPS time server or other NTP server products. http://www.armagard.co.uk Related Articles Acer Aspire One Netbook Review Laptop: Top Tips Laptop: Top Tips Save Money by Investing in Printer Supplies Etiquettes to follow at bingo chat rooms Buying Computer Memory Online ? Why All the Great Deals? Buying a Netbook? 5 Things To Know Before You Buy Fixing Jams and Replacing the Foil Cartridge on the Fastback PowisPrinter Where To Shop For Computer Hardware Where To Buy a Motherboard For Your Computer Tips On Where To Buy a Word Processor For Your home Or Office The Computer Graphics Card ? Know Your Facts Before You Buy The Benefits Of a Four Processor Core Computer How To Shop For Computer Parts At a Computer Parts Store Hard Drives For Sale ? Where To Buy Them Desktop Processors Explained Choosing the Optimal PCI Graphics Cards Buying Computer Memory Online ? Why All the Great Deals? Innovative Approach Used In VXA Backup Tape Format Aztek Computers - Computer Hardware at Factory Prices-? Online Dealers for Computer Hardware, Soft Buy Kindle 2 Wireless Reader Kindle 2 eBook Learning Device Watching TV On PC For Free Compaq Presario B1255TU Finding an Affordable Laptop Approach patrons with smart websites Approach patrons with attractive websites How to Buy Computer Equipment Internet services now available with wi-fi hotspot software How to perform a clean installation of Windows XP View More Similar Articles Copyright © 2009 A1Articles - Internet articles and article directory service All rights reservedPrivacy Policy | Codes of Conduct | Sitemap | Archived articles Our Network:
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Ensuring a computer is not only displaying the correct time but that it is being maintained accurately is not as straight-forward as it first sounds.
Most Linux systems have two clocks. The hardware clock, also known as the CMOS of Bios clock, is usually a simple crystal oscillator with battery back-up that maintains time when your system is off or boots up. This clock is usually located on the motherboard and will run all the time, however these clock chips tend to lose time as the computer ages and the battery weakens.
The other clock, the system clock, is a software clock and it starts when you boot up your system often getting an initial time from the hardware clock. System clocks keep time by adding seconds on to a prime epoch, a base time that for Linux and Unix, began at midnight on January 1, 1970.
However, the hardware clock is a cheap electronic oscillator and cannot maintain time to any useful degree of accuracy. They often drift several seconds a day which for day-to-day process is probably adequate but with time sensitive applications it can cause serious problems.
A better way is to set the system clock using the time from a NTP (Network Time Protocol) time server. These dedicated time servers get a UTC (Coordinated Universal Time) time from an atomic clock which are the most accurate time keepers in the world, not losing a second in time in several millions of years.
Dedicated NTP servers use either a radio receiver to pick-up a radio time and frequency broadcast which are transmitted by several national laboratories or by using the timing signal broadcast from the GPS network.
Linux uses a NTP service called NTP Daemon (ntpd). This uses NTP to adjust the system clock for any drift in time as it frequently check the UTC time source.
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about a network time server or other ntp server solutions.
This article is free for republishing
Source: http://www.a1articles.com/article_592240_10.html Occupation: writer Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated time server products. Please visit us for more information about a GPS time server or other NTP server products. http://www.armagard.co.uk Related Articles Acer Aspire One Netbook Review Laptop: Top Tips Laptop: Top Tips Save Money by Investing in Printer Supplies Etiquettes to follow at bingo chat rooms Buying Computer Memory Online ? Why All the Great Deals? Buying a Netbook? 5 Things To Know Before You Buy Fixing Jams and Replacing the Foil Cartridge on the Fastback PowisPrinter Where To Shop For Computer Hardware Where To Buy a Motherboard For Your Computer Tips On Where To Buy a Word Processor For Your home Or Office The Computer Graphics Card ? Know Your Facts Before You Buy The Benefits Of a Four Processor Core Computer How To Shop For Computer Parts At a Computer Parts Store Hard Drives For Sale ? Where To Buy Them Desktop Processors Explained Choosing the Optimal PCI Graphics Cards Buying Computer Memory Online ? Why All the Great Deals? Innovative Approach Used In VXA Backup Tape Format Aztek Computers - Computer Hardware at Factory Prices-? Online Dealers for Computer Hardware, Soft Buy Kindle 2 Wireless Reader Kindle 2 eBook Learning Device Watching TV On PC For Free Compaq Presario B1255TU Finding an Affordable Laptop Approach patrons with smart websites Approach patrons with attractive websites How to Buy Computer Equipment Internet services now available with wi-fi hotspot software How to perform a clean installation of Windows XP View More Similar Articles Copyright © 2009 A1Articles - Internet articles and article directory service All rights reservedPrivacy Policy | Codes of Conduct | Sitemap | Archived articles Our Network:
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Source: http://www.a1articles.com/article_592240_10.html
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