High Availability (HA) describes systems that are dependable enough to operate continuously without failing. They are well-tested and sometimes equipped with redundant components.
“Availability” includes two periods of time: how much time a service is accessible, and how much time the system needs to respond to user requests. High availability refers to those systems that offer a high level of operational performance and quality over a relevant time period.
When it comes to measuring availability, several factors are salient. These include recovery time and both scheduled and unscheduled maintenance periods.
Typically, availability as a whole is expressed as a percentage of uptime defined by service level agreements (SLAs). A score of 100 percent characterizes a system that never fails.
Netzary delivers High Availability Solutions based on 3 fundamental principles.