HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

initiator port A fibre-channel port configured to send remote I/Os to an RCU target port on another storage
system. See also RCU target port and target port.
intermediate site
(I-site)
A site that functions as both a Cnt Ac-S secondary site and a Continuous Access Journal primary
site in a 3-data-center (3DC) cascading configuration.
internal volume A logical volume whose data resides on drives that are physically located within the storage
system. See also external volume.
IO, I/O input/output
IOPS I/Os per second
IP internet protocol
IPL initial program load
JNL journal
JNLG journal group
journal group
(JNLG)
In a Continuous Access Journal system, journal groups manage data consistency between multiple
primary volumes and secondary volumes. See also consistency group (CTG).
journal volume A volume that records and stores a log of all events that take place in another volume. In the
event of a system crash, the journal volume logs are used to restore lost data and maintain data
integrity.
In Continuous Access Journal, differential data is held in journal volumes until it is copied to the
S-VOL.
JRE Java Runtime Environment
L1 pair See layer-1 (L1) pair.
L2 pair See layer-2 (L2) pair.
LAN local-area network
layer-1 (L1) pair In a Business Copy cascade configuration, a layer-1 pair consists of a primary volume and
secondary volume in the first cascade layer. An L1 primary volume can be paired with up to
three L1 secondary volumes. See also cascade configuration.
layer-2 (L2) pair In a Business Copy cascade configuration, a layer-2 (L2) pair consists of a primary volume and
secondary volume in the second cascade layer. An L2 primary volume can be paired with up to
two L2 secondary volumes. See also cascade configuration.
LBA logical block address
LCP local control port; link control processor
LCU logical control unit
LDEV logical device
LDKC See logical disk controller (LDKC).
leaf volume A level-2 secondary volume in a Business Copy cascade configuration. The primary volume of a
layer-2 pair is called a node volume. See also cascade configuration.
LED light-emitting diode
license key A specific set of characters that unlocks an application and allows it to be used.
local copy See in-system replication.
local site See primary site.
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.
logical unit (LU) A logical volume that is configured for use by open-systems hosts (for example, OPEN-V).
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