Quick Answer: How Many Nines Is High Availability?

How many nines are in uptime?

Percentage calculationAvailability %Downtime per yearDowntime per day99.9999% (“six nines”)31.56 seconds86.40 milliseconds99.99999% (“seven nines”)3.16 seconds8.64 milliseconds99.999999% (“eight nines”)315.58 milliseconds864.00 microseconds99.9999999% (“nine nines”)31.56 milliseconds86.40 microseconds12 more rows.

What does 3 nines mean?

Three nines or 99.9% availability allows 8 hours, 46 minutes downtime per year. Two nines or 99% availability allows 3 days, 15 hours and 40 minutes downtime per year. One nine or 9% availability allows over 332 days of downtime per year.

What is the difference between failover and high availability?

Failover is a means of achieving high availability (HA). Think of HA as a feature and failover as one possible implementation of that feature. Failover is not always the only consideration when achieving HA. … Requiring more nodes to respond means less availability, and requiring fewer nodes means more availability.

What is scalability and high availability?

Scalability simply refers to the ability of an application or a system to handle a huge volume of workload or expand in response to an increased demand for database access, processing, networking, or system resources. High Availability.

How many hours is 99.9 uptime?

What does availability/uptime mean in the real world?Availability %Downtime per yearDowntime per month*99%3.65 days7.20 hours99.5%1.83 days3.60 hours99.8%17.52 hours86.23 minutes99.9% (“three nines”)8.76 hours43.2 minutes7 more rows•May 6, 2010

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 9’s of availability are required?

The accepted availability standard for emergency response systems is 99.999% or “five nines” – or about five minutes and 15 seconds of downtime per year (see table below). To achieve five nines, all components of the system must work seamlessly together.

What is considered high availability?

High Availability (HA) describes systems that are dependable enough to operate continuously without failing. They are well-tested and sometimes equipped with redundant components. … High availability refers to those systems that offer a high level of operational performance and quality over a relevant time period.

What does 5 nines mean?

99.999%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 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.

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.

What does 6 nines mean?

Five-nines or 99.999% availability means 5 minutes, 15 seconds or less of downtime in a year. Or, if you are really ambitious, shoot for six nines or 99.9999% availability, which allows 32 seconds or less downtime per year.

How is SLA calculated?

Resolution SLA% = The percentage of the number of tickets resolved within the SLA divided by the total number of tickets resolved during the selected time period within the filters.

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 many minutes per month of downtime is 99.99 Availability?

Identify dependenciesSLADowntime per weekDowntime per month99.9%10.1 minutes43.2 minutes99.95%5 minutes21.6 minutes99.99%1.01 minutes4.32 minutes99.999%6 seconds25.9 seconds1 more row•Oct 16, 2019

What does 4 nines mean?

4.38 minutes downtime per monthJul 8, 2016·4 min read. Let’s start with what 4 9’s means exactly: Four Nines is 4.38 minutes downtime per month, or 52.56 minutes per year. That’s probably more than acceptable for almost all services on the Internet, not all, but almost all. So your email is down for 4 minutes each month, not the end of the world.

What does 999 mean?

If you’re seeing number 999 quite often, the spiritual meaning of 999 is commonly related to the end of a cycle in your life. It is a means of closure to clear away unfulfilling things so that you can prepare for a whole new cycle.

What does 99% uptime mean?

If your business uses a service with a 99% uptime guarantee that means you should expect: 14 minutes, 24 seconds of downtime every day; 1 hour, 40 minutes and 48 seconds of downtime every week; 6 hours, 43 minutes and 12 seconds of downtime every month and.

What does 999 mean in the Bible?

In the Bible number 999 is a symbol of salvation and God. Actually, we have to mention the Beast number 666 that is always represented as a number of evil. We need to compare it with number 999, because 999 represents the overturned number 666.

How many nines are there?

Significance of “Nines”Availability MeasureDowntime Per YearDowntime Per Week90% (one nine)36.5 days16.8 hours99% (two nines)3.65 days1.68 hours99.9% (three nines)8.76 hours10.1 minutes99.99% (four nines)52.6 minutes1.01 minutes3 more rows•Apr 5, 2018

What is a downtime?

1 : time during which production is stopped especially during setup for an operation or when making repairs. 2 : inactive time (such as time between periods of work) napping during our downtime an injured athlete facing months of downtime.