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Uptime is a measure of system ... Users of Linux systems can use the BSD uptime utility, ... The first number is the total number of seconds the system has been up. ...
High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization.
/proc/uptime, the length of time the kernel has been running since boot and spent in idle mode (both in seconds) /proc/version, containing the Linux kernel version, distribution number, gcc version number (used to build the kernel) and any other pertinent information relating to the version of the kernel currently running
“Cold” standby systems are offline until the active fails and typically restart from a “baseline” state. For example, many cloud solutions will restart a virtual machine on another physical machine if the underlying physical machine fails. “Cold” fail over standby latency can range from 30+ seconds to several minutes.
A post on the Linux mailing list considers its +1 tick insufficient to avoid Moire artifacts from such collection, and suggests an interval of 4.61 seconds instead. [9] This change is common among Android system kernels, although the exact expression used assumes an HZ of 100. [10]
The problem exists in systems which measure Unix time—the number of seconds elapsed since the Unix epoch (00:00:00 UTC on 1 January 1970)—and store it in a signed 32-bit integer. The data type is only capable of representing integers between −(2 31 ) and 2 31 − 1 , meaning the latest time that can be properly encoded is 2 31 − 1 ...
uptime: Tells how long the system has been running users: Prints the user names of users currently logged into the current host who: Prints a list of all users currently logged in whoami: Prints the effective userid: yes: Prints a string repeatedly [A synonym for test; this program permits expressions like [ expression].
The 64-bit timestamps used by NTP consist of a 32-bit part for seconds and a 32-bit part for fractional second, giving NTP a time scale that rolls over every 2 32 seconds (136 years) and a theoretical resolution of 2 −32 second (233 picoseconds). NTP uses an epoch of 1 January 1900.