6027-2158 Disk usage must be dataOnly, metadataOnly, descOnly, dataAndMetadata, vdiskLog, vdiskLogTip, vdiskLogTipBackup, or vdiskLogReserved.
Explanation
The disk usage positional parameter in a vdisk descriptor
has a value that is not valid. The bad disk descriptor is displayed
following this message.
User response
Correct the input and reissue the command.