Glossary
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.
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.
CU Control unit.
CVS Custom volume size. CVS devices (OPEN-x CVS) are custom volumes configured using array
management software to be smaller than normal fixed-size OPEN system volumes. Synonymous
with volume size customization (VSC). OPEN-V is a CVS-based volume.
emulation mode The LDEVs associated with each RAID group are assigned an emulation mode that makes them
operate like OPEN system disk drives. The emulation mode determines the size of an LDEV.
OPEN-3: 2.46 GB
OPEN-8: 7.38 GB
OPEN-9: 7.42 GB
OPEN-E: 13.56 GB
OPEN-K: Not available
OPEN-L: 36 GB
OPEN-M Not available
OPEN-V: User-defined custom size
failover The process that occurs when one device assumes the workload of a failed companion device.
Failovers can be planned or unplanned.
FC Fibre Channel. A network technology primarily used for storage networks.
FC-AL Fibre Channel arbitrated loop.
FCA Fibre Channel Adapter.
FCP Fibre Channel Protocol.
HBA Host bus adapter.
host mode Each port can be configured for a particular host type. These modes are represented as two-digit
hexadecimal numbers. For example, host mode 08 represents an HP-UX host.
LD, LDEV Logical device. An LDEV is created when a RAID group is carved into pieces according to the
selected host emulation mode (that is, OPEN-3, OPEN-8, OPEN-9). The number of resulting LDEVs
depends on the selected emulation mode. The term LDEV is also known as term volume.
LUN Logical unit number. A LUN results from mapping a SCSI 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. For example, a LUN associated with two OPEN-3
LDEVs has a size of 4,693 MB.
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.
OFC Open Fibre Control.
OPEN-
x
A general term describing any of the supported OPEN emulation modes (for example, OPEN-E).
There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as OPEN-3,
OPEN-8, OPEN-9, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based
volume.
PA Physical address.
path A path is created by associating a port, a target, and a LUN ID with one or more LDEVs. Also
known as a LUN.
154 Glossary
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