HP XP7 User Manual page 332

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 A group of 255 control unit (CU) images in the RAID storage system that is controlled by a virtual
controller (LDKC) (logical) storage system within the single physical storage system. For example, the
XP24000/XP20000 Disk Array storage system supports two LDKCs, LDKC 00 and LDKC 01.
logical partition A subset of a system's hardware resources that is virtualized as a separate system. For a storage
(LPAR) system, logical partitioning can be applied to cache memory.
logical unit (LU) A logical volume that is configured for use by open-systems hosts (for example, OPEN-V).
logical unit (LU) The path between an open-systems host and a logical unit.
path
logical volume See volume.
logical volume A logical volume that is configured for use by mainframe hosts (for example, 3390-9).
image (LVI)
LPAR logical partition
LU logical unit
LUN logical unit number
LV logical volume
LVI See logical volume image (LVI).
LVM Logical Volume Manager; logical volume management
M-JNL main journal
main control unit A storage system at a primary or main site that contains primary volumes of Continuous Access
(MCU) 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).
master journal Holds differential data on the primary Continuous Access Journal system until it is copied to the
(M-JNL) restore journal (R-JNL) on the secondary system. See also restore journal (R-JNL).
max. maximum
MCU See main control unit (MCU).
MF, M/F mainframe
MIB message information block
mig. migration
mirror In Continuous Access Journal, each pair relationship in and between journal groups is called a
"mirror". Each pair is assigned a mirror ID when it is created. The mirror ID identifies individual
pair relationships between journal groups.
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.
no. number
NUM number
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.
P-P point-to-point
P-VOL See primary volume.
PA physical address
pair Two logical volumes in a replication relationship in which one volume contains original data to
be copied and the other volume contains the copy of the original data. The copy operations can
be synchronous or asynchronous, and the pair volumes can be located in the same storage system
(in-system replication) or in different storage systems (remote replication).
332 Glossary