HP XP P9500 Storage User Manual

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logical device
(LDEV)

An individual logical data volume (on multiple drives in a RAID configuration) in the storage
system. An LDEV may or may not contain any data and may or may not be defined to any hosts.
Each LDEV has a unique identifier or “address” within the storage system composed of the logical
disk controller (LDKC) number, control unit (CU) number, and LDEV number. The LDEV IDs within
a storage system do not change.An LDEV formatted for use by mainframe hosts is called a logical
volume image (LVI). An LDEV formatted for use by open-system hosts is called a logical unit (LU).

logical disk
controller (LDKC)

A group of 255 control unit (CU) images in the RAID storage system that is controlled by a virtual
(logical) storage system within the single physical storage system. For example, the Universal
Storage Platform V storage system supports two LDKCs, LDKC 00 and LDKC 01.

logical unit (LU)

A logical volume that is configured for use by open-systems hosts (for example, OPEN-V).

logical unit (LU)
path

The path between an open-systems host and a logical unit.

logical volume

See volume.

logical volume
image (LVI)

A logical volume that is configured for use by mainframe hosts (for example, 3390-9).

logical unit

LUN

logical unit number

logical volume

M-JNL

main journal

M-VOL

main volume

main control unit
(MCU)

A storage system at a primary or main site that contains primary volumes of Continuous Access
Synchronous Z remote replication pairs. The MCU is configured to send remote I/Os to one or
more storage systems at the secondary or remote site, called remote control units (RCUs), that
contain the secondary volumes of the remote replication pairs. See also remote control unit (RCU).

main site

See primary site.

main volume
(M-VOL)

A primary volume on the main storage system in a Continuous Access Synchronous Z copy pair.
The M-VOL contains the original data that is duplicated on the remote volume (R-VOL). See also
remote volume (R-VOL).

master journal
(M-JNL)

Holds differential data on the primary Continuous Access Journal system until it is copied to the
restore journal (R-JNL) on the secondary system. See also restore journal (R-JNL).

max.

maximum

megabyte

MB/sec, MBps

megabytes per second

Mb/sec, Mbps

megabits per second

MCU

See main control unit (MCU).

MF, M/F

mainframe

MIH

missing interrupt handler

mirror

In Continuous Access Journal, each pair relationship in and between journals is called a “mirror”.
Each pair is assigned a mirror ID when it is created. The mirror ID identifies individual pair
relationships between journals.

modify mode

The mode of operation of Remote Web Console that allows changes to the storage system
configuration. See also view mode.

microprocessor

MP blade

Blade containing an I/O processor. Performance in the storage system is tuned by allocating a
specific MP blade to each I/O-related resource (LDEV, external volume, or journal). Specific
blades are allocated, or the storage system can automatically select a blade.

MSCS

Microsoft Cluster Server

mto, MTO

mainframe-to-open

mirror unit

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Glossary