Uptime
Uptime is an English term for the time in which a computer system is running and functional, in German so uptime, uptime or even plain time. The term was coined to describe the counter- part of the downtime, ie the time in which a system is turned off, or at least is not functional.
The uptime is specified as the time since the last boot of the system. The uptime is an indication of the stability of an operating system and the hardware. It determines the actual availability of the system. Computer service providers often advertise Uptimegarantien to attract customers. So corresponds to a 99.99 -percent uptime in a year a downtime of no more than about an hour. Other values can be read right in the table.
Uptime as a Unix command
The uptime command displays on Unix derivatives from the current time, the uptime of the system, the number of registered users and the Load average over the last 1, 5 and 15 minutes.
$ uptime 10:52 PM up 127 days, 7:45, 3 users, load averages: 0.21 0:24, 0:23 OpenVMS systems can enter the show system command to get a similar output as uptime on Unix systems it outputs (where the uptime in hours: seconds is displayed: Minutes):
$ Show system OpenVMS V7.3 -2 on node JERRY 29- JAN- 2008 16:32:04.67 Uptime 894 22:28:52 Uptime on Windows systems
On newer Microsoft Windows operating systems (Windows XP Professional and Windows Server 2003 and Windows Vista ), the uptime of the system via the command systeminfo at the command prompt is brought to you. The line labeled System Up Time ( in German localization system operating time ) will display the uptime:
> Systeminfo | findstr " Up Time " System Up Time: 0 Days, 8 Hours, 7 Minutes, 19 Seconds German version > Systeminfo | findstr " system uptime " System Up Time: 1 days, 13 hours, 44 minutes, 54 seconds Starting with Windows 7, the start time may instead be issued:
German version > Systeminfo | findstr " boot time " System start time: 22/01/2012, 17:32:04 or English (in this case Windows Server 2008)
> Systeminfo | findstr " System.Boot.Time " System Boot Time: 3/28/2012, 1:31:07 PM For Windows 2000, Windows XP Home and Windows 7, the start time is available with the net statistics server command:
> Net statistics server Server Statistics for \ \ COMPUTERNAME Statistics since 9/19/2007 5:42 PM ... For Windows Vista and Windows 7 is the runtime directly into the Task Manager, under the tab performance, integrated. In Windows 8, the running time is also there, but only in the overview of CPU power.
Trivia
Netcraft maintains statistics on the availability of many thousands of web servers and web hosts. With advent of internet, the achievement of the greatest possible uptime has become the "Sport". There are projects on the Internet, which are used only for comparison of uptimes of different computers.