HP Hitachi Dynamic Link Manager Software Licenses - Manual (Page 512)

file already exists, the utility appends execution information onto the end of
the log file.
If the size of the log file is equal to or greater than 1 MB when the utility is
executed, the log file is renamed to hdlm_installux_sh2.log, and a new log
file is created and named hdlm_installux_sh.log, to which the execution
information is output.
Note
The hdlm_installux_sh.log and hdlm_installux_sh2.log log files are not
deleted when HDLM is removed. Manually delete the log files, if they are no
longer required.
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Utility Reference
Hitachi Dynamic Link Manager (for Linux®) User Guide