Glossary - HP StorageWorks P9000 - Disk Arrays Manual
Hp storageworks p9500 site preparation guide (av400-96306, november 2010)
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Glossary
access method
An IBM-specific term for software that moves data between main storage and I/O devices to
create channel programs and manage system buffers.
AL
Arbitrated loop.
AL-PA
Arbitrated loop physical address.
allocation
The ratio of allocated storage capacity versus total capacity as a percentage. Allocated storage
refers to those logical devices (LDEVs) that have paths assigned to them. Allocated storage capacity
is the sum of the storage of these LDEVs. Total capacity is the sum of the capacity of all LDEVs
on the disk array.
ambient
The air temperature in the area where a system is installed. Also called intake temperature or
temperature
room temperature.
array group
A group of four or eight physical hard disk drives (HDDs) installed in a P9000 or XP disk array
and assigned a common RAID level. RAID1 array groups consist of four (2D+2D) or eight HDDs
(4D+4D). RAID5 array groups include a parity disk, but also consist of four (3D+1P) or eight
HDDs (7D+1P). All RAID6 array groups are made up of eight HDDs (6D+2P).
ATM
Asynchronous transfer mode.
baud
The maximum rate of signal state changes per second on a communication circuit. If each signal
state change corresponds to a code bit, then the baud rate and the bit rate are the same. It is
also possible for signal state changes to correspond to more than one code bit so the baud rate
may be lower than the code bit rate.
BC
HP StorageWorks P9000 or XP Business Copy. An HP StorageWorks application that provides
volume-level, point-in-time copies in the disk array.
BC z
This is the version of BC that supports mainframe volumes. See BC for more information.
bit
The basic unit of data in a binary numbering system (binary digit), represented by a 0 or a 1.
Eight bits equals one byte.
CB
Circuit Breaker.
CHA
Channel adapter. A device that provides the interface between the array and the external host
system. Occasionally, this term is used synonymously with the term channel host interface processor
(CHIP).
CLI
Command-line interface. An interface comprised of various commands which are used to control
operating system responses.
CLPR
cache logical partitions.
CNT
Computer network technologies.
Cnt Ac-J
HP StorageWorks P9000 or XP Continuous Access Journal Software.
Cnt Ac-J Z
This is the version of Continuous Access Journal that supports mainframe volumes. See Cnt Ac-J
for more information.
Cnt Ac-S
HP StorageWorks P9000 or XP Continuous Access Synchronous software.
Cnt Ac-S Z
This is the version of Continuous Access Synchronous that supports mainframe volumes. See Cnt
Ac-S for more information.
command device
A volume in the disk array that accepts HP StorageWorks Continuous Access, HP StorageWorks
Business Copy, or HP StorageWorks P9000 Business Continuity Manager control operations,
which are then executed by the array.
CT group
Consistency group.
CTGID
Consistency group ID. The group identifier used to identify a group of volumes in the HP
StorageWorks P9500 Disk Array being replicated using an asynchronous technology. The
consistency group feature guarantees the sequencing of updates to the secondary volumes.
CU
Control Unit. The Control Unit is used to organize the storage space attached to the DKC, you
can group similarly configured logical devices (LDEVs) with unique control unit images (CUs).
CUs are numbered sequentially. The disk array supports a certain number of CUs, depending
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Glossary
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