Many organizations have strict rules for deploying enterprise-level software that might include deployment of staging areas whenever possible. A staging area is a copy of the installation.
Never install a deployment during a normal production shift; instead, choose a period of low utilization for installation. If a testbed is not available, create a staging area and make and test all changes in the staging area.
If possible, install the deployment in stages to reduce the size and complexity of each step in the overall process. Doing so makes debugging easier. Verify each stage of the deployment as described in Chapter 11, “Validating Your Deployment (Acceptance Testing).”