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Downtime

The formula derives the percentage of the time service is available. The inverse is the amount of downtime.

Details

Formula:

[1 – (Availability/100)] X 365 X 24 X 60


Unit: Percentage

Direction: Minimize

Benchmark Results


This KPI is most used for:
Operational Excellence

Comments

  1. Chris R.

    In this formula, should a number be plugged in where you have the word “available”? If so, what number should it be?

  2. Ralph C.

    I would think that the availability value would be derived from your server monitoring method, whatever that may be.

  3. Sean M.

    Serial and parallel availability discussed at http://kpilibrary.com/kpis/availability-2

    regards

  4. Eng Tatt Tan

    http://www.edgeblog.net/2007/in-search-of-five-9s/

    Common Availability Definitions:

    1. Availability = MTBF/(MTTR+MTBF) (Mean Time Between Failure, Mean Time To Recover). This is a classic definition of availability and is often used by hardware manufacturers when they publish an availability metric for a given server.

    2. Availability = (Uptime + Scheduled Maintenance)/(Unscheduled Downtime + Uptime + Scheduled Maintenance). This is an IT centric availability metric where the business can support scheduled downtime after hours. This model works for some types of systems, such as a file server that isn’t needed at night, but it doesn’t work as well for websites, even though many web companies still use this for their SLAs.

    3. Availability = Uptime/(Uptime + Downtime). This metric best applies to systems that are needed 24×7 such as e-commerce sites.
    Downtime = Scheduled Downtime + Unscheduled Downtime

  5. bruce buell

    but is the number a percent, or number of hours, or what?

  6. Michelle Herrera

    This formula is the inverse?

  7. Amr Abouzied

    To get the downtime overall % = Downtime / Overall time * 100
    For example: the system should be up for 24 hours, and downtime was 3 Hours.

    Overall Downtime % = 3 / 24* 100 = 12.5%

  8. Amr Abouzied

    To get the downtime overall % = Downtime / Overall time * 100
    For example: the system should be up for 24 hours, and downtime was 3 Hours.

    Overall Downtime % = 3 / 24* 100 = 12.5%

  9. Amr Abouzied

    To get the downtime overall % = Downtime / Overall time * 100
    For example: the system should be up for 24 hours, and downtime was 3 Hours.

    Overall Downtime % = 3 / 24* 100 = 12.5%

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