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High Availability Consulting |
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Every day, IT is faced with the challenge of delivering high levels of data and application availability across a wide array of operating systems, applications, hardware components across data center locations. In particular, enterprise IT organizations are facing intense pressure to ensure their mission-critical applications and data are constantly available. Preparing your business for highest level service availability (99.999%) starts with keen understanding of what each application means to your business. A High Availability solution is one that is designed to achieve optimal uptime avoiding any single points of failure in hardware, operating system, networks, storage and applications. With high availability solutions in place, businesses can provide reliable computing services to their clients and employees to increase productivity and hence improve profits. All of these business drivers are making High Availability the de facto standard in enterprises today.
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Measurement of High Availability
Availability of the system is inversely proportional to dowmtime. If downtime is reduced, system availability will improve. For a highly available system, dowmtime can be defined as:
| "Availability of a system can be increased by decreasing downtime" |
| Availability |
Downtime (Min./year) |
| 99.999% |
5 |
| 99.99% |
50 |
| 99.9% |
500 |
| 99% |
5000 |
| 90% |
50000 |
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Total Downtime in a Year=
(planned shutdown + Unplanned shutdown) in hours.
Availability of a system =(Number of hours in ayear) -
(Total hours of downtimein a year) X 100 |
| (Number of hours in a year ) |
The aim is to reduce downtime as much as possible to achieve maximum availability. If Service Level Agreement (SLA) requirement is to achieve five nines or 99.999%, the total downtime of a system in a year should be 5 minutes
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Total downtime will only constitute unplanned shutdown if the availability requirement of an application is during business hours (i.e., 8x5, and not 24x7). Availability of these applications will be defined as:
Availability of a system =
(Number of business hrs) - (Total downtime due to unplanned shutdown) X 100 |
| (Number of business hours) |
Planned shutdown can be scheduled out of business hours, and, therefore, the availability of the system can be significantly improved by reducing only unplanned shutdown.
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Technologies employed to create highly available environments include clustering software, fault tolerant/redundant components, multi-pathing interconnects, RAID volumes. The overall level of availability is dependant upon the availability of the components within the solution that is; any component can both directly or indirectly reduce the availability of the remainder of the components if it is not highly available itself. The ultimate solution design objective for the highest level of availability should be to have no single point of failure. Storage subsystems like all other subsystems in the High Availability solution can be configured with different levels of availability.
Unix Applications can help you create an IT environment that supports your ability to satisfy customers and generate revenue. Our independent consultants are experienced in the design and implementation of High Availability solutions and will ensure that the solutions will meet your requirements. |
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| With a strong knowledge and understanding of operating systems, networks, and |
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| Every day, IT is faced with the challenge of delivering high levels of data and application |
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| As the amount of data proliferates in enterprises today, IT managers are faced |
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| AUnix Applications Limited provides consultancy to customers in middleware |
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