Hitachi Dynamic Link Manager Software Users Guide for AIX

Devices Managed by HDLM
Below is a list of devices that can or cannot be managed by HDLM. The
devices that can be managed by HDLM are called HDLM management-target
devices.
HDLM management-target devices:
The following devices are from the storage systems listed in Section What
is HDLM? on page 1-2:
¢
SCSI devices
¢
Boot disks (including boot disks on a client logical partition in a virtual
I/O server environment)
¢
Command devices (such as Hitachi RAID Manager command devices)
¢
Dump devices
¢
Swap devices
Non-HDLM management-target devices:
¢
SCSI devices other than those that are in the storage systems listed
in Section
What is HDLM? on page 1-2
¢
Built-in disks on a host
¢
Non-disk devices (tape devices, etc.)
System Configuration
HDLM manages routes between a host and a storage system by using the
SCSI driver. The host and storage systems are connected using SAN with
fiber cables. The cable port on the host is a host bus adapter (HBA). The
cable port on the storage system is a port (P) on a channel adapter (CHA).
A logical unit (LU) contained in a storage system is the target of input to, or
output from, the host. An area in an LU is called a Dev. A route that connects
a host and a Dev in an LU is called a path.
HDLM manages a path by assigning an ID to it. This ID is called the
AutoPATH_ID. A path may also be called a management target. The ID that
AIX assigns to a path is called the OS management path ID. The OS
management path ID can be displayed by executing the AIX lspath
command. Also, HDLM can display the OS management path ID that
corresponds to the path management PATH_ID when you execute the HDLM
command's view operation with the -lu or -drv parameter specified. For
details about the view operation, see
view (Displays Information) on page
6-34.
The following figure shows the HDLM system configuration.
HDLM Functions
2-3
Hitachi Dynamic Link Manager (for AIX) User Guide