Seagate ST43401N/ND Guia de Instalação descarregar pdf (Página 91)

CHAPTER 7 Test: Ensuring Stability and Performance

•A phased cutover is subject to the highest performance expectations.

Some performance tuning of the production workload after cutover of the

production server may be best. You can time the production server cutover

to occur as soon as performance gains are acceptable and testing is

successful.

See Chapter 4, “Plan: Writing a Plan and Getting Ready to Migrate” for

information on migration methods.

Developing Fallback Procedures

Before you begin testing, be sure that you know how you will return the test

system to a known state when you have a problem. You will use the same

fallback plan when you migrate the production system.

During simple testing cycles, it’s sometimes faster to back out unwanted

changes. However, this is not recommended for timed runs during

benchmarking. You have to restore from backup after each timed run to return

the system to a known state.

Back up all databases before and after the test system upgrade, as you would

for a “real” upgrade. The backups preserve the layout of data on disk and help

you avoid confusion due to fragmentation and page splits.

To ensure source code control, use scripts for all changes to objects. This

makes it much easier to recreate your environment if necessary.

Summary of Testing Techniques

You can use a variety of testing techniques in your test plan. The following

table summarizes the advantages and disadvantages of various testing

techniques and tools:

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Seagate ST43401N/ND Guia de Instalação Página 91