beautypg.com

HP Hitachi Dynamic Link Manager Software User Manual

Page 732

background image

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.

This manual is related to the following products: