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Uptime ( in German: operating time) is an English expression for the time in which a computer system is running and functional, including available operating time or clear time . The term originated to describe the opposite of downtime , i.e. H. the time in which a system is switched off or at least not functional.

Total downtime ( HH : MM : SS )
Availability per day per month per year
99.999% 00: 00: 00.4 00:00:26 00:05:15
99.99% 00:00:08 00:04:22 00:52:35
99.9% 00:01:26 00:43:49 08:45:56
99% 00:14:23 07:18:17 87:39:29

The uptime is given as the time since the system was last started. 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 uptime guarantees to attract customers. A 99.99 percent uptime in a year corresponds to a downtime of a maximum of about one hour. Other values ​​can be found in the table on the right.

uptime as a Unix command

The command uptime are on Unix derivatives the current time, the uptime of the system, the number of connected users and the Load Average over the last 1, 5 and 15 minutes.

$ uptime
10:52PM  up 127 days,  7:45, 3 users, load averages: 0.21, 0.24, 0.23

Users of OpenVMS systems can use the show system command to receive output similar to that output by uptime on Unix systems (where the uptime is displayed in the format hours: minutes: seconds ):

$ 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 systems (from Windows XP Professional as well as Windows Server 2003 and Windows Vista ) the uptime of the system can be found out using the systeminfo command in the command prompt . The line with the label System Up Time (in German localization system operating time ) shows the uptime:

> systeminfo | findstr "Up Time"
System Up Time:            0 Days, 8 Hours, 7 Minutes, 19 Seconds
deutsche Version 
> systeminfo | findstr "Systembetriebszeit"
Systembetriebszeit:                   1 Tage, 13 Stunden, 44 Minuten, 54 Sekunden

Starting with Windows 7, the start time can be output instead:

deutsche Version 
> systeminfo | findstr "Systemstartzeit"
Systemstartzeit:                               22.01.2012, 17:32:04

or English (here: Windows Server 2008 )

> systeminfo | findstr "System.Boot.Time"
System Boot Time:          3/28/2012, 1:31:07 PM

In Windows 2000 , Windows XP Home and Windows 7 , the start time is available with the net statistics server command :

> net statistics server
Serverstatistik für \\COMPUTERNAME

Statistik seit 9/19/2007 5:42 PM

In Windows Vista and Windows 7 , the runtime is integrated directly into the task manager under the Performance tab . In Windows 8 , the runtime is also there, but only in the overview of the CPU performance.


Netcraft maintains statistics on the availability of many thousands of web servers and web hosts . With the advent of the Internet, achieving the greatest possible uptime has become a "sport". There are projects on the Internet that only serve to compare the uptimes of different computers.

See also

Web links