HP XP P9500 Storage - Manual (Page 206)

Glossary
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.
BC P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies
in the disk array.
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.
CLI Command-line interface. An interface comprised of various commands which are used to control
operating system responses.
CLPR Cache logical partition.
Cnt Ac-J P9000 or XP Continuous Access Journal software.
Cnt Ac-S P9000 or XP Continuous Access Synchronous software.
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 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. 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.
CVS CVS devices (OPEN-x CVS or 3390-x CVS) are custom volumes configured using array
management software to be smaller or larger than normal fixed-size OPEN or mainframe system
volumes. Synonymous with volume size customization (VSC). OPEN-V is a CVS-based volume.
daemon A process in UNIX systems that runs in the background, without any direct user console or terminal
interaction.
DKA Disk adapter.
DKC Disk controller.
failover The process that occurs when one device assumes the workload of a failed companion device.
Failovers can be planned or unplanned.
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.
GUID Globally unique identifier.
HBA Host bus adapter.
HDD Hard disk drive.
HORCM_CMD A section of the RAID Manager instance configuration file that defines the disk devices used as
command devices by RAID Manager to communicate with the disk array.
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