Verifying disk usage

The -v option controls whether the mmcrfs command checks whether the specified disks can safely be added to the file system.

The default (-v yes) is to perform the check and fail the command if any of the disks appear to belong to some other GPFS™ file system. You should override the default behavior and specify -v no only if the mmcrfs command rejects the disks and you are certain that all of the disks indeed do not belong to an active GPFS file system. An example for an appropriate use of -v no is the case where an mmcrfs command is interrupted for some reason and you are reissuing the command. Another example would be if you are reusing disks from an old GPFS file system that was not formally destroyed with the mmdelfs command.