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

110 Chapter 3 Creating an HDLM Environment
3.7 Checking the Path Configuration
HDLM functionality such as load balancing and failover is only available for HDLM
management-target devices that have more than one active path. After you install HDLM or
change the hardware configuration, check the structure and statuses of these paths.
To check the path information, use the dlnkmgr command's view operation or use the Path
List view in the Path Management window of the HDLM GUI. The following subsection shows
how to check the path information. For details about the Path List view, see section
6.2.4.
How to use the HDLM command's view operation to check path information is described
below. For details about the view operation, see section
7.7.
Specify the -path parameter and check the output information:
Execute the following command:
>dlnkmgr view -path > redirect-destination-file
Open redirect-destination-file-1 and check the following:
– Make sure that an LU accessed by a path exists.
A path can be identified with PathName. The LU that is accessed by a path can be
identified with a combination of DskName and iLU.
– Make sure that all paths are online.
Make sure that PathStatus is Online. If there is a path whose status is not online,
Reduced will be displayed.
– Make sure that the combinations of the CHA port (ChaPort), through which paths
access the same LU, and the HBA port (the host port number and bus number
displayed in the PathName column) are different. (for multipath configurations)
The two-digit number from the left of the numbers displayed for PathName
indicates an host port number. The numbers displayed between the period to the
right of the host port number and the next period indicate a bus number.
– Make sure that there are different host port numbers and bus numbers for each
physical HBA port (for multipath configurations)
If the system cannot be configured in a multi-path configuration, perform the following
operations:
 In the Device Manager window of Windows, select Disk drives and then click Scan for
hardware changes.
 In the Disk Management window of Windows, click Rescan Disks.