Hp XP P9500 Storage Manuel d'utilisateur Page 360

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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. A 1-byte value that the arbitrated loop topology uses to identify
the loop ports. This value becomes the last byte of the address identifier for each public port on
the loop.
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
temperature
The air temperature in the area where a system is installed. Also called intake temperature or
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). This is also known
as a parity group or a RAID group.
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 P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies
in the disk array.
BC Z The version of Business Copy that supports mainframe volumes.
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 partition.
CNT Computer network technologies.
Cnt Ac-J P9000 or XP Continuous Access Journal software.
Cnt Ac-J Z The version of Continuous Access Journal that supports mainframe volumes.
Cnt Ac-S P9000 or XP Continuous Access Synchronous software.
Cnt Ac-S Z The version of Continuous Access Synchronous that supports mainframe volumes.
command device A volume in the disk array that accepts Continuous Access, Business Copy, or P9000 for 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 P9500 Disk
Array being replicated using asynchronous technology. The consistency group guarantees the
sequencing of updates to the secondary volumes.
CU Control Unit. Used to organize the storage space attached to the disk controller ( 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 on the
360 Glossary
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