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Uptime is a Measurement of the system time a computer system has been "up" and running. It came into use to describe the opposite of downtime, times when a system was not operational. The uptime and reliability of computer and communications facilities is sometimes measured in nines. "Five nines" means 99.999% availability, which translates to a total downtime of approximately five minutes and fifteen seconds per year.

{] reliability and stability, in that this time represents the time a computer can be left unattended without crash (computing)ing, or needing to be rebooted for administrative or maintenance purposes. Long uptime can also indicate negligence as many critical updates require reboot on some operating systems.

The uptime(1) command on Unix systems will show the current time, the uptime, the number of users and Load (computing) for the past 1, 5 and 15 minute intervals.

$ uptime 10:52PM up 1337 days, 7:45, 3 users, load averages: 0.21, 0.24, 0.23

The Uptime-Project, until 1st March 2007, collected data on uptimes from users, and the current record for longest uptime is 6 years, 98 days, 12 hours, 6 minutes and 44 seconds on a computer running SunOS 5.6.{{cite web | title = Uptime Project - Toplist: Records (Now defunct) | url=http://en.uptime-project.net | accessdate = 2006-04-30 --> The uptime of a personal computer is sometimes displayed as a badge of honour on an [email signature or web site/forum. This was especially true in the [Windows 9x days, where [Windows NT and [Windows 2000 users would boast of uptimes of more than 30 days, whereas many real-world Windows 9x installations crashed more often. In more recent times very long uptimes for home users with Windows NT and Windows 2000 machines are less striking because the Windows 9x line has been replaced by the Windows NT-based [Windows XP.

Netcraft maintains the uptime records for many thousands of web hosting computers.

Users of Windows XP Professional and Windows Server 2003 systems can type systeminfo at the command prompt to display all system information, including the System Up Time.

Notes

See also

External links



UNIX man pages : uptime ()
UPTIME(1) Linux User's Manual UPTIME(1) NAME uptime - Tell how long the system has been running. SYNOPSIS uptime uptime [-V]

Uptime - Wikipedia, the free encyclopedia
Uptime is a measure of the time a computer system has been "up" and running. It came into use to describe the opposite of downtime, times when a system was not operational.

Unix Manual Page for uptime
NAME uptime - show how long the system has been up SYNOPSIS uptime DESCRIPTION The uptime command prints the current time, the length of time the system has been up, and ...

Netcraft Uptime Survey
Web tool retrieves hosting software information from any domain name.

Netcraft What's That Site Running Results
Note: Uptime - the time since last reboot is explained in the FAQ Time in Days; Plotted Value No. samples Max Latest; Windows 2000 : 939 : 563.61: 189.58

Uptime Overlord
High quality free web server monitor ... About Uptime Overlord Screenshots Contact FAQ: Do you have a website ? Is it up and running right now

Coreix :: 100% Network Uptime
100% Network uptime guaranteed from Carbon Neutral Datacentre provider Coreix, specialising in Windows and Linux managed servers for small business and enterprise companies

Sh3lls.net Server Uptime - Updated Every 5 minutes.
The list of domains available for the clients of sh3lls.net for their custom or private vhosts. All the public vhosts of sh3lls.net are made using these domains

iomart -Managed Hosting, Complex hosting, Colocation, UK Data Centres ...
100% Uptime is our company mantra not a marketing phrase. To offer 100% Uptime we have to live and breathe it. It’s not simply about network availability.

uptime
System Uptime. Hello user at msnbot-65-55-208-238.search.msn.com (65.55.208.238) System uptime on Friday, 15th August 2008 12:20:19 AM: 12:20AM up 93 days, 5:44, 7 users, load ...





 
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