If an HDLM device is not specified for the iostat command, the HDLM device will not be displayed. Information about an HDLM device is displayed only when the HDLM device is specified for the iostat command (in such case as iostat -x /dev/sddlmaa). The information (CPU or I/O statistics) displayed for the HDLM device is always 0, and the actual value is displayed for each SCSI device that conforms to the HDLM device.
If you are going to obtain information about an HDLM device, perform calculations by using the value of a SCSI device that conforms to the HDLM device. The following is an example of executing the iostat command.
Figure. Example of executing the iostat command