HP Hitachi Dynamic Link Manager Software - Manual (Page 498)

C. Glossary
476
D
Dev (Device)
A logical division of an LU that HDLM controls and operates. A Dev is equivalent to
a logical volume in AIX.
In an AIX environment, each LU has only one Dev.
Each Dev has a Dev number.
Depending on the access method, Devs are classified into two types: block devices and
character devices.
(See also: Dev number)
Dev number
A number that is assigned to a device within an LU. The device numbers are assigned
sequentially from 0. A Dev number is called a logical volume number in AIX.
HDLM operates assuming that one LU has one Dev, so the device number is fixed to
0
.
(See also: Dev)
E
emulation type
An LU type that is accessible from a host. Since an HDLM management-target host is
an open-system host such as a PC or a UNIX computer, the HDLM management-target
host can access only the LUs that have open-system emulation types.
For details on emulation types supported by a storage system, see the maintenance
manual for that particular storage system.
F
failback
A function for placing the status of a path recovered from an error into the Online
status, and then switching the access path to the path that was just recovered.
failover
A function for switching to another normal path if there is an error in the current access
path, thereby enabling the system to continue to operate.
H
HBA (Host Bus Adapter)
Device that functions as an interface connecting a host with external devices.
In this manual, the term HBA refers to an interface card installed in a host, in