HP Hitachi Dynamic Link Manager Software - Manual (Page 37)

Figure 2-6 About Alphabetic Letters Used in the Logical Device File Name
About numeric values used in a logical device file name:
[1-15] indicates a partition number in the applicable LU. When the HDLM
configuration definition utility (dlmcfgmgr) is executed, all logical device
files for partitions 1 to 15 are created.
For example, if the logical device file name of an HDLM device is
sddlmaa1, it indicates partition 1 on sddlmaa. To specify the entire LU,
simply use sddlmaa. Note that HDLM creates block device files. The
system dynamically selects the major number of the block device that this
file uses.
HDLM Functions
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Hitachi Dynamic Link Manager User Guide for Linux ®