Regardless of whether HDLM is used in a non-boot disk environment or in a boot disk environment, you cannot specify an HDLM device for the kernel dump output destination.
If you specify a directory in the file system created on the HDLM device for the kernel dump output destination, HDLM will not operate when a kernel dump is collected. In this case, the kernel dump will not be output because the HDLM device cannot be accessed.