Glossary - HP StorageWorks P9000 - Disk Arrays Reference Manual

Glossary

AL Arbitrated 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 HP StorageWorks P9000 or XP Business Copy. An HP StorageWorks 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 partitions.
CNT Computer network technologies.
Cnt Ac-J HP StorageWorks P9000 or XP Continuous Access Journal Software.
Cnt Ac-S HP StorageWorks P9000 or XP Continuous Access Synchronous software.
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
on the disk array model. Each CU can manage multiple LDEVs. Therefore, to uniquely identify a
particular LDEV requires both the CU number and the LDEV number.
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.
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 serial data transport infrastructure and protocol used to implement storage area networks
(SANs).
GUID Globally unique identifier.
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.
HORCM_DEV A section of the RAID Manager instance configuration file that describes the physical volumes
corresponding to the paired volume names.
HORCM_INST A section of the RAID Manager instance configuration file that defines how RAID Manager groups
link to remote RAID Manager instances.
HORCM_LDEV A section of the RAID Manager instance configuration file that specifies stable LDEV and serial
numbers of physical volumes that correspond to paired logical volume names.
198 Glossary