When you run the metassist command, you can specify the level of verbose output. More verbose output can help diagnose problems, such as determining why disks were or were not selected for use in a volume, or to determine why a specific attempted command failed. Less verbose output can reduce the amount of extraneous information that you must review.
When you specify output verbosity, you can learn what the metassist command does and how it makes its decisions. This information is useful for troubleshooting some of the following:
Why a volume was created in a certain way
Why a volume was not created
What volumes the metassist command would create, without actually creating the volumes