Seagate ST43401N/ND Guía de instalación descargar pdf (Pagina 90)

Prioritizing Applications to be Tested

You need to make adjustments when you have less disk space or memory in the

test system. Scale down databases proportionally, while retaining the same data

distributions so optimizer decisions remain constant. Scale down memory to

ensure consistent I/O rates.

Reproduce data layout across available devices as closely as possible.

If you use fewer CPUs, adjust transaction arrival rates (that is, load) and

concurrent users proportionally.

Prioritizing Applications to be Tested

Since it may be difficult to test all application functions, gather user input to

identify the most critical transactions. Write tests for those functions using the

techniques described in the following sections. Functions not tested at this time

can be validated during user acceptance tests.

Establishing Performance Criteria

Depending on the migration plan you developed, you may want to meet or

exceed the performance you get with your current system. For example, you

might decide to apply guidelines like these:

•For parallel with replication:

• Be sure to measure the overhead of the replication mechanism. For

example, if the replication costs 10%, do not begin parallel operations

until release 12.5 is tuned to outperform by 10%.

• For an around-the-clock operation, you may decide that an initial goal

of breaking even is reasonable.

•For cutover without replication, gear the migration for equivalent

performance between the old and new systems. A goal of breaking even

the first week is reasonable.

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Seagate ST43401N/ND Guía de instalación Pagina 90