Quick Answer: What Is Uptime And Downtime?

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 many nines is high availability?

Hitting 99.9% availability is better, at just under nine hours of downtime a year. Companies aiming for high availability (HA) talk about four nines (less than an hour of downtime a year), which is what we strived for during my time at Netflix.

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 are the 3 types of SLA?

ITIL focuses on three types of options for structuring SLA: Service-based, Customer-based, and Multi-level or Hierarchical SLAs. Many different factors will need to be considered when deciding which SLA structure is most appropriate for an organization to use.

How do you calculate uptime and downtime?

We calculate uptime by calculating the minutes of uptime divided by the total number of minutes for the specified period. So, February has 29 days this year, 29 days x 24 hours x 60 minutes = 41760 minutes. 49 minutes of downtime, means that the site was up for 41711, and 41711 / 41760 = 0.9988, thus the 99.88% uptime.

What is the difference between uptime and downtime?

Uptime of a machine or equipment is the time it is spending available to fulfill its preliminary function. While downtime is the time it is spending not available to fulfill its preliminary function.

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.

How is downtime calculated?

One way to calculate the cost of equipment downtime is to look at the loss of revenue over downtime periods. … If there are 4 hours of downtime, then, we’ve lost $2,000.00 in those 4 hours alone.

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.

What is uptime in cloud computing?

Cloud uptime is the amount of time that a cloud service hosted by a cloud provider is accessible to end users.

How do you measure downtime?

Downtime is any time the equipment is not available for production, including planned and unplanned downtime. To calculate system availability for a certain period of time, divide an asset’s total amount of uptime by the sum of total uptime and total downtime.

What is data integrity in cloud computing?

The Data Integrity is simply termed as no corruption in the data that can be assured with consistency and accuracy over the time Precisely it can be defined as the data should be recorded as the Original and at the time of retrieval it should ensure that it send the Original recorded data.

What does 4 nines mean?

Just to give a glimpse of what it means: Five-nines or 99.999% availability means 5 minutes, 15 seconds or less of downtime in a year. Four nines or 99.99% availability allows 52 minutes, 36 seconds downtime per year.

How do you define uptime?

Uptime is a measure of system reliability, expressed as the percentage of time a machine, typically a computer, has been working and available. Uptime is the opposite of downtime.

How does the uptime command do?

Uptime is a command that returns information about how long your system has been running together with the current time, number of users with running sessions, and the system load averages for the past 1, 5, and 15 minutes. It can also filter the information displayed at once depending on your specified options.

What is average uptime?

If we step back for a moment to consider the uptime seen with typical industry standard (x86-based) physical systems, 95 percent to 99 percent uptime is a pretty common range. If we look at clustered industry standard systems, the range typically falls between 99.5 percent and 99.9 percent uptime.

How many hours is 99.9 downtime?

Percentage calculationAvailability %Downtime per yearDowntime per month99.9% (“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 minutes99.995% (“four and a half nines”)26.30 minutes2.19 minutes12 more rows