The proportion of time a system is available, typically guaranteed as a percentage.
Availability indicates how reliably a service can be reached, measured as the ratio of uptime to total time. Common figures include 99.9% ("three nines", approximately eight and a half hours of downtime per year) or 99.99%. It is typically agreed upon in a Service Level Agreement (SLA), often with consequences for falling below the threshold. Availability is closely linked to contingency planning, RTO/RPO, and the underlying architecture.
For service providers, guaranteed availability is a central topic in both sales and contracts, and a recurring theme in tenders. Clients want to know the percentage figure, the measurement methodology, and the measures behind it. This information is contained in SLAs and architecture documents, yet it has to be formulated anew for every inquiry. Those who keep their availability commitments and their technical basis readily at hand can respond quickly and avoid contradictory information across different proposals.
With Tendry, your availability commitments and the associated explanations are immediately at hand as verified knowledge. This allows you to answer SLA-related questions in tenders consistently and without having to consult the operations team.
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