# Quick Answer: How Much Downtime Is 99.5 Availability?

## How do you calculate monthly availability?

Typically, IT organizations use a percentage, such as 99.999% availability, to do this….Putting these numbers into the availability equation gives:Weekly availability = 100% x (168 – 8) / 168 = 95.2%.Monthly availability = 100% x (730 – 8) / 730 = 98.9%Quarterly availability = 100% x (2190 – 8) / 2190 = 99.6%.

## What is a good uptime percentage?

Represented as a ratio of the time available divided by the total time, providers calculate the ratio in monthly or yearly increments. Although 100% uptime is the goal, the industry considers 99.999% uptime as high availability.

## What is uptime and downtime?

Uptime is a computer industry term for the time during which a computer or IT system is operational. … Downtime, the opposite of uptime, is the period of time when a system is not operational. The terms uptime and downtime are used to define the level of success provided by real-time services.

## What is the downtime?

The term downtime is used to refer to periods when a system is unavailable. Downtime or outage duration refers to a period of time that a system fails to provide or perform its primary function. Reliability, availability, recovery, and unavailability are related concepts.

## What is the difference between uptime and availability?

Uptime is a measure of system reliability, expressed as the percentage of time a machine, typically a computer, has been working and available. This means that a system is ready for operation. … Availability is the probability that a system will work as required when required during the period of a mission.

## How should you calculate the monthly uptime percentage?

“Monthly Uptime Percentage” for a service is calculated as Maximum Available Minutes less Downtime divided by Maximum Available Minutes x 100. Monthly Uptime Percentage is represented by the following formula: Monthly Uptime % = (Maximum Available Minutes-Downtime) / Maximum Available Minutes x 100.

## How many hours is 99.9 downtime?

Percentage calculationAvailability %Downtime per yearDowntime per month99.8%17.53 hours87.66 minutes99.9% (“three nines”)8.77 hours43.83 minutes99.95% (“three and a half nines”)4.38 hours21.92 minutes99.99% (“four nines”)52.60 minutes4.38 minutes12 more rows

## What does 99.9 percent uptime mean?

Uptime is the amount of time that a service is available and operational. Uptime is generally the most important metric for a website, online service or web based provider and is expressed as a percentage such as ‘99.9%’. For example a 99.9% uptime equates to 43 minutes and 50 seconds of downtime.

## How do you define availability?

Availability is the probability that an item will be in an operable and committable state at the start of a mission when the mission is called for at a random time, and is generally defined as uptime divided by total time (uptime plus downtime).

## How do you ensure system availability?

Here are five things you can and should focus on when building a system to make sure that, as its use scales upwards, availability remains high:Build with failure in mind.Always think about scaling.Mitigate risk.Monitor availability.Respond to availability issues in a predictable and defined way.

## How is downtime availability calculated?

Availability = Uptime ÷ (Uptime + downtime) That equals 10 hours of total downtime.

## How many minutes per month downtime is 99.99 Availability?

five minutesAn uptime of 99.99% translates to about five minutes of total downtime per month.

## How much downtime is acceptable?

Most companies strive for 99.9 percent uptime. That equates to 8 hours and 45 minutes of website downtime per year, but by putting certain practices into place you may actually be able to achieve 99.99 percent uptime, which equates to less than an hour of downtime each year.

## What is mechanical availability?

Mechanical availability is a measure of a refinery or process unit’s capacity to operate based on the condition of the equipment, without adjusting for any other operational or commercial limits. This is effectively the maximum physical capability for the hardware.

## What is considered high availability?

High availability refers to a system or component that is operational without interruption for long periods of time. High availability is measured as a percentage, with a 100% percent system indicating a service that experiences zero downtime. … But four nines uptime is still 52 minutes of downtime per year.

## What does 5 nines mean?

From Wikipedia, the free encyclopedia. Five nines, commonly taken to mean “99.999%”, may refer to: High availability of services, when the downtime is less than 5.26 minutes per year. Nine (purity), a 99.999% pure substance.

## Does availability include planned downtime?

How to calculate system availability. There are two components to the system availability formula. The first is total uptime and the second is total downtime. … Downtime is any time the equipment is not available for production, including planned and unplanned downtime.

## How can I get high availability?

Here are some of the key resources you can implement to make high availability possible:Implement multiple application servers. … Scaling and slaves matters. … Spread out physically. … Maintain a recurring online backup system along with hardware. … Use of a virtualized server for zero-downtime recovery.