Hitachi XP P9500 User Manual page 732

D. Glossary
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
(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.
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.
failback
A function for placing the status of a path recovered from an error into the
status, and then switching the access path to the path that was just recovered.
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because HDLM manages Devs in units of LUs.
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