HP XP Array Manager Software - Manual (Page 121)

Glossary
This glossary defines the special terms used in this document. Click the desired letter at the bottom of
every glossary page to display the glossary entries that start with that letter.
allocated volume An LDEV for which one or more host paths are defined.
cache A set of RAM (Random Access Memory) modules used to store data temporarily.
capacity The amount of data storage space available on a disk drive or storage system.
Measured in MB, but it can also be measured in other units such as TB and PB,
depending on the total storage space.
CLI Command Line Interface
CLPR Cache Logical Partition
copy pair A primary and secondary volume pair linked by the volume replication
functionality of a storage system.
CSV Comma Separated Value
CU (Control Unit) Created in an storage system. Also called a CU image. The LDEVs created in a
storage system are connected to a single CU, and a number is assigned to each
CU for identifying its LDEVs. Therefore, volumes (LDEVs) in a storage system are
specified by the CU number (CU#) and LDEV number.
data drive A physical data storage device that can be either a hard disk drive (HDD) or a
flash (solid-state) drive.
data pool One or more logical volumes designated to temporarily store original data.
When a snapshot is taken of a primary volume, the data pool is used if a data
block in the primary volume is to be updated. The original snapshot of the volume
is maintained by storing the changeable data blocks in the data pool.
DB Database
device A physical or logical unit with a specific function.
DEVN Device number that is assigned to each logical address.
DHCP Dynamic Host Configuration Protocol
DKCMAIN Disk controller main
DKP Disk processor
DKU Disk unit
external volume A logical volume whose data resides on drives that are in an externally connected
storage system.
User Guide 121