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Uptime is a measure of how long a computer, system, or service has been continuously operational and available for use. It is expressed either as a duration (e.g., days, weeks) or, more commonly, as a percentage of the total time, indicating system reliability and stability. A system with higher uptime is considered more reliable and is less likely to crash or need reboots for maintenance.

Key aspects of uptime

Measure of reliability: Uptime is a key performance indicator for system and network reliability. A high uptime suggests a system can be left unattended for long periods without crashing.

Duration vs. Percentage:

Duration: Can be a simple measure of how long a system has been running since its last boot, such as "up 29 days".

Percentage: Often used in service agreements (SLAs) to guarantee a certain level of availability over a period, like "five nines" (99.999%).

Uptime vs. Availability: While related, these terms are distinct. Uptime is a component of availability. For example, a system might have high uptime but still be unavailable if a specific service on it is down.

How it's maintained: Achieving high uptime requires strategies like server clustering, failover systems, and load balancing to ensure a service remains available even if a single component fails.