6027-1365 Disk diskName already belongs to file system fileSystem.
Explanation
The specified disk name is already assigned to a GPFS™ file system. This may be because
the disk was specified more than once as input to the command, or
because the disk was assigned to a GPFS file
system in the past.
User response
Specify the disk only once as input to the command,
or specify a disk that does not belong to a file system.