Hp XP Continuous Access Software Instrukcja Użytkownika Pobierz pdf (Strona 405)

Glossary 405

HORCM_MON A section of the RM instance configuration file that defines the instance

you are configuring.

host mode Each port can be configured for a particular host type. These modes are

represented as two-digit hexadecimal numbers. For example, host mode 08

represents an HP-UX host.

hot standby Using one or more servers as a standby in case of a primary server failure.

HP Hewlett-Packard Company.

instance An independent copy of RM. Instances are local or remote and can run on

the same host.

instance

configuration file

A file that defines the link between a volume and an RM instance. This file

consists of four sections:

HORCM_MON, HORCM_CMD,

HORCM_DEV and HORCM_INST.

LCP Local control port.

LDEV Logical device. An LDEV is created when a RAID group is divided into

sections using a host emulation mode (for example, OPEN-9 or OPEN-M).

The number of resulting LDEVs depends on the emulation mode. The term

LDEV is often used synonymously with the term volume.

local disk A disk in the local array. Sometimes refers to a disk in a local host.

local instance The RM instance currently being configured or the instance to which

commands are issued.

LUN Logical unit number. A LUN results from mapping a SCSI logical unit

number, port ID, and LDEV ID to a RAID group. The size of the LUN is

determined by the emulation mode of the LDEV and the number of LDEVs

associated with the LUN. For example, a LUN associated with two OPEN-

3 LDEVs has a size of 4,693 MB.

LUSE Logical Unit Size Expansion, a feature which logically combines LDEVs

so they appear as a larger LDEV. This allows a LUN to be associated with 2

to 36 LDEVs. Essentially, LUSE makes it possible for applications to

access data requiring a large amount of disk space.

MB Megabyte.

MCU Main control unit.

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Hp XP Continuous Access Software Instrukcja Użytkownika Strona 405