HP XP P9500 Storage - Manual (Page 25)

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 (sd or ssd devices)
¢ Boot disks #
¢ Swap devices #
¢ Dump devices #
#:
If you want to use these disks as HDLM management-target devices,
assign VTOC labels to them. EFI labels are not supported.
Non-HDLM management-target devices:
¢
SCSI devices (sd or ssd devices) other than those of the storage
systems listed in Section What is HDLM? on page 1-2
¢
Built-in disks in a host
¢
Devices other than disks (tape devices, etc.)
¢
Command devices of the storage systems listed in Section What is
HDLM? on page 1-2 (For example, Hitachi RAID Manager command
devices.)
System Configuration
HDLM manages routes between a host and a storage system by using the
SCSI driver (sd or ssd driver). The host and storage systems are connected
using SAN with fiber cables or SCSI 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. You can divide an LU into multiple areas. Each area
after the division is called a Dev. The Dev is equivalent to a slice or partition.
A route that connects a host and an LU is called a physical path, and a route
that connects a host and a Dev is called a path. When an LU has been divided
into multiple Devs, the number of paths set to the LU is equal to the number
that is found by multiplying the number of physical paths by the number of
Devs in the LU.
HDLM assigns an ID to each physical path and manages paths on a physical-
path basis. Because you do not need to be aware of the difference between
physical paths and paths to operate HDLM, the following descriptions might
simply refer to paths, without distinguishing between physical paths and
HDLM Functions
2-3
Hitachi Dynamic Link Manager User Guide for Solaris ®