Hitachi Dynamic Link Manager, User Manual, Page: 732 / 746

D. Glossary
708
D
Dev (Device)
A logical division of an LU that HDLM controls and operates.
A Dev is equivalent to a
partition in Linux.
In Linux, each LU can be divided into more than 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 Dev number (the DNum column) in the configuration list in HDLM.
This number is assigned to each Dev within an LU. In Linux, a Dev number is called
a partition number .
The Dev number is set to
0
because HDLM manages Devs in units of LUs.
(See also: Dev )
domain
An environment in which Xen is used to manage OSs.
The domain that has management privileges for Xen is called
domain0 . The other
domains are called domainU .
E
emulation type
An LU type that is accessible from a host. Since an HDLM host is an open-system host
such as a PC or a UNIX computer, the HDLM 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.