Jul 8, 2020 · According to ITIL ®, availability refers to the ability of a configuration item or IT service to perform its agreed function when required. It is calculated by using this equation: Agreed service time is the expected time the service will be in operation.

Mar 16, 2021 · Service availability is simply the measure of the service being available and accessible to the customers during the time you promised to keep the service available. It’s usually calculated as a percentage.

Jan 2, 2025 · Here are five service availability or availability management questions you should consider asking: Which of your business functions are so critical that protecting them from downtime is a priority? How does the length of any downtime affect your business?

Sep 16, 2024 · Service availability refers to the amount of time a service is available for use, often measured as a percentage. It can also be defined as the probability of a system being able to deliver a service.

Mar 10, 2025 · There are two primary methods for measuring system availability: server-side metrics, which focus on infrastructure and service health, and client-side metrics, which simulate customer interactions to assess the true availability from the user’s perspective.

Sep 3, 2019 · This article asks how easy is the availability management practice in IT service management (ITSM) and the new ITIL 4 best practice? Ah, availability management. It sounds very comforting because we all want availability – especially when something is needed.

To calculate service availability, you start by establishing a clear service availability or agreed service time (AST) for a specific reporting period. Then, keep track of any downtime (DT) during that period.

May 30, 2014 · Uptime and availability, the two most often referred to terms in conveying the reliable of an IT service. Service providers often boost their service uptime in 99.99% (four-9s), 99.999% (five-9s) or even higher percentages.

Jan 5, 2017 · This article discusses the most important ITIL KPIs for availability management, as well as their application and formula, when applicable. 1. Availability (excluding planned downtime)

Aug 4, 2020 · Service availability. Most IT organizations define availability for IT services. Availability is typically determined by: Reliability; Maintainability; Serviceability; Performance; Security; Availability is most often calculated as a percentage. This calculation is often based on agreed service time (as defined in the SLA) and downtime.