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Appendix D 355
Using SNAplus2 in a High Availability Environment
What is High Availability?
What is High Availability?
High availability is a term used to describe an environment in which
mission critical applications are protected from severe impact of various
failures . These failures might include entire computer system failures,
network failures, software failures, power failures, disk drive failures,
and I/O interface failures. If the result of any one failure is the complete
loss of the mission critical application, then a single point of failure
exists. The main goal of high availability is to achieve maximum uptime.
High availability networks should have sufficient redundancy of
software and hardware components so that a single point of failure will
not disrupt service.
To see what types of failures are considered important, look at the
following example of a typical SNAplus2 client/server network that is not
designed for high availability.