HP XP P9500 Storage - Manual (Page 141)

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 on until it is copied to
the S-VOL.
JRE Java Runtime Environment
LAN local-area network
LBA logical block address
LCP local control port; link control processor
LCU logical control unit
LDEV logical device
LDKC See logical disk controller (LDKC).
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. For example, the Universal
Storage Platform V storage system supports two LDKCs, LDKC 00 and LDKC 01.
logical volume See volume.
logical volume
image (LVI) A logical volume that is configured for use by mainframe hosts (for example, 3390-9).
LV logical volume
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).
max. maximum
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