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HP XP P9500 User Manual: Glossary

Continuous access synchronous for mainframe systems.
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Glossary

AL
Arbitrated loop.
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.
CLPR
Cache logical partition.
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.
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
disk array model. Each CU can manage multiple LDEVs; therefore, both the CU number and the
LDEV number are required to identify an LDEV.
DFSMS
Data Facility Storage Management Subsystem.
DKA
Disk adapter.
DKC
Disk controller.
ERC
Error reporting communications.
failover
The process that occurs when one device assumes the workload of a failed companion device.
Failovers can be planned or unplanned.
FBA
Fixed-block architecture.
FC-AL
Fibre Channel Arbitrated Loop.
FC-FP
Fibre Channel Framing Protocol
fence level
A method of setting rejection of P9000 or XP Continuous Access write I/O requests from the host
according to the condition of mirroring consistency.
Fibre Channel
A data transfer architecture designed for mass storage devices and other peripheral devices that
require high bandwidth.
FICON
Fibre connectivity. An FC layer 4 protocol used to map mainframe channel command and data
I/O operations onto standard FC infrastructure, protocol, and FC services.
instance
A running copy of RAID Manager. Instances can be local or remote. Multiple instances can run
on the same host.
LDKC
Logical disk controller.
local disk
A disk in the local array. Sometimes refers to a disk in a local host.
local instance
The RAID Manager instance currently being configured or the instance to which commands are
issued.
LUN
Logical unit number. A LUN results from mapping a logical unit number, port ID, and LDEV ID to
a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the
number of LDEVs associated with the LUN.
LUSE
Logical Unit Size Expansion. The LUSE feature is available when the HP StorageWorks LUN
Manager product is installed, and allows a LUN, normally associated with only a single LDEV,
to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access
a single large pool of storage.
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