HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

HiCommand
®
Dynamic Link Manager (HDLM) for Windows
®
Systems User’s Guide 15
2.3 LU Configuration
When you install HDLM, the LU configuration recognized by the host changes as follows:
 Before installing HDLM:
In the disk management window of the host, a SCSI device is displayed for each path.
This means a single LU in the storage system is recognized as the number of LUs that
correspond to the number of paths.
 After installing HDLM:
The MPIO driver integrates the LUs that are recognized for each path. In the disk
management window of the host, the disk corresponding one-to-one with an LU in the
storage system is displayed.
This means, from the host, LUs in the storage system are recognized as only one LU
regardless of the number of paths.
In Windows, you can display the SCSI device in the Device Manager windows.
An LU recognized by a host after HDLM installation, is called a host LU (HLU). The areas in a
host LU that correspond to the Dev in a storage system LU are called host devices (HDev).
On a system using HDLM, to access the target LU, a drive letter is assigned to the disk
integrated by the MPIO driver (the disk displayed in the disk management window of
Windows).
Figure 2.4 shows the LU configuration recognized by the host after HDLM installation.
Figure 2.4 LU Configuration Recognized by Host After HDLM Installation