HP XP7 Storage - Manual (Page 20)

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
¢
Hitachi storage system command devices, such as Hitachi RAID
Manager command 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. A host and a storage system are connected via an FC-SAN or an
IP-SAN.
System Configuration Using an FC-SAN
In an FC-SAN, fiber cables connect hosts to storage systems. The cable port
on the host is called a host bus adapter (HBA). The cable port on the storage
system is called a port (P) on a channel adapter (CHA).
A logical unit (LU), which lies in a storage system, is either an input target or
an output target to or from a host. The areas within an LU are called Devs.
A route that connects a host to a Dev in an LU is called a path.
HDLM assigns a unique ID to each management-target path. This ID is called
AutoPATH_ID. Sometimes, the path is also just simply called a management
target.
The following figure shows the configuration of an HDLM system using an FC-
SAN.
2-2
HDLM Functions
Hitachi Dynamic Link Manager (for VMware®) User Guide