HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

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).
LU logical unit
LUN logical unit number
LV logical volume
M-JNL main journal
M-VOL main or primary volume
main control unit
(MCU)
A storage system at a primary or main site that contains primary volumes of Cnt Ac-S 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 Cnt Ac-S Z copy pair. The M-VOL contains
the original data that is duplicated on the remote or secondary volume. See also remote volume
(S-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
MB 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.
MP 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
MU mirror unit
multi-pathing A performance and fault-tolerant technique that uses more than one physical connection between
the storage system and host system. Also called multipath I/O.
node volume A level-2 primary volume in a Business Copy cascade configuration. The secondary volume of a
layer-2 pair is called a leaf volume. See also cascade configuration.
NUM number
NVS nonvolatile storage
OPEN-V A logical unit (LU) of user-defined size that is formatted for use by open-systems hosts.
OPEN- x A logical unit (LU) of fixed size (for example, OPEN-3 or OPEN-9) that is used primarily for
sharing data between mainframe and open-systems hosts using Data Exchange.
OS operating system
180 Glossary