HP XP Array Manager Software - Manual (Page 271)

Glossary
allocated volume A logical device (LDEV) for which one or more host LUN paths are defined.
cache A set of RAM (Random Access Memory) modules used to store data temporarily.
cache logical
partition Virtual cache memory that is set up to be allocated to hosts that are in contention
for cache memory. CLPRs can be used to segment storage system cache that is
assigned to parity groups.
capacity The amount of data storage space available on a physical storage device,
generally measured in bytes (MB, GB, TB, and so on).
CLI command line interface
CLPR See cache logical partition.
concatenated
parity group The concatenation of two or more parity groups into one group. Using a
concatenated parity group reduces the time that is required to access data
(especially sequential data).
control unit (CU) 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.
copy pair A primary and secondary volume pair linked by the volume replication
functionality of a storage system. The primary volume contains original data,
and the secondary volume contains the copy of the original.
Copy operations can be synchronous or asynchronous, and the volumes of the
copy pair can be located in the same storage system (local copy) or in different
storage systems (remote copy).
CSV comma-separated values
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 (dev or
DEV) A physical or logical unit with a specific function.
DEVN Device number that is assigned to each logical address when using an LDEV on
a mainframe host.
User Guide 271