Logical unit numbers (LUNs) are used in SCSI protocols to differentiate
disk drives in a common SCSI target device, such as a storage system. An
open-systems host uses a LUN to access a particular LU.
logical volume (LV)
See volume.
logical volume image (LVI)
An LDEV that is configured for use by mainframe hosts (for example,
3390-3).
LU
See logical unit (LU).
LUSE
LUN expansion; LU size expansion
LUSE volume
A combined LU composed of multiple OPEN-x devices. A LUSE device can
be from 2 to 36 times larger than a fixed-size OPEN-x LU. LUSE lets the
host access the data on the storage system using fewer LU numbers.
LV
logical volume. See volume.
M
main control unit (MCU)
A storage system at a primary, or main, site that contains primary
volumes of remote replication pairs. The main control unit (MCU) is
configured to send remote I/O instructions to one or more storage
systems at the secondary, or remote, site, called remote control units
(RCUs). RCUs contain the secondary volumes of the remote replication
pairs. See also remote control unit (RCU).
main site
See primary site.
Mb
megabit
308 Glossary
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
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