The DCU can be run in interactive mode or non-interactive.
You first see it from the installation boot disk. But you can also run it as "dcu" or from the "Hardware_Setup" icon.
It is also run during boot (you will see the start-up messages as various HBA's are found).
Can also be use in a postinstall script to make either allow the user to manually update settings, or to automatically do them.
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