Glossary - HPE XP7 User Manual

Glossary

This glossary defines the special terms used in this document. Click the letter links
below to navigate.
access path A path through which data and commands are transferred within the storage system.
array Another name for an HP XP7 storage system.
bind mode In bind mode the Cache Residency extents are used to hold read and write data for specific
extents on volumes. Data written to the Cache Residency bind area is not destaged to the
drives. For bind mode, all targeted read and write data is transferred at host data transfer speed.
cache ESW Access paths between the cache switch and the cache memory.
cache logical Consists of virtual cache memory that is set up to be allocated to different hosts in contention
partition (CLPR) for cache memory.
capacity The amount of data storage space available on a physical storage system, usually measured
in bytes (MB, GB, TB, and so on.).
CCHH cylinder-cylinder, head-head
CHA See channel adapter (CHA).
channel adapter The hardware component that processes channel commands from hosts and manages host
(CHA) access to cache.
CHP channel path; channel processor. The channel processors are the microprocessors on the
channel adapter features of the XP24000 Disk Array.
CLI command line interface
CLPR cache logical partition
command device A dedicated logical volume used only by RAID Manager to interface with the storage system.
Can be shared by several hosts.
consistency A group of pairs on which copy operations are performed. Specifying a consistency group ID
group (CTG) performs a specific operation for all pairs belonging to the consistency group simultaneously
while keeping data consistency.
CTG Consistency group, for details see consistency group (CTG).
CU control unit
custom volume A custom-size volume whose size is defined by the user using Virtual LVI/Virtual LUN.
(CV)
DCR Dynamic Cache Residency
device A physical or logical unit with a specific function.
disk adapter The hardware component that controls the transfer of data between the drives and cache. A
(DKA) DKA feature consists of a pair of boards.
disk array Disk array, or just array, is another name for an HP XP7 storage system.
disk controller The hardware component that manages front-end and back-end storage operations. The term
(DKC) DKC is sometimes used to refer to the entire XP7 Storage system.
DKA See disk adapter (DKA).
DKC disk controller. Can refer to the XP7 Storage system or the controller components.
DKCMAIN disk controller main. Refers to the microcode for the XP7 Storage system.
DKP disk processor. Refers to the microprocessors on the disk adapter features of the XP24000
Disk Array.
DRR data recovery and reconstruction
EB exabyte
ECKD extended count-key data
emulation The operation of the XP7 Storage system to emulate the characteristics of a different storage
system. For device emulation the mainframe host "sees" the logical devices on the XP7 Storage
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