The HDLM device and each partition of the HDLM device that is recognized by Linux and can be used are recorded in the /proc/partitions file. The /proc/partitions file records the I/O statistics per device; however, it does not record the I/O statistics of the HDLM device. The I/O statistics are always 0.
If you are going to obtain statistics about an HDLM device, perform calculations by using the value recorded for the SCSI device that corresponds to the HDLM device. The following is an example of output statistics.
Figure. Example of a displayed /proc/partitions file