FC-AL Fibre Channel arbitrated loop.
FCP Fibre Channel Protocol.
fence level A level for selecting rejection of a write I/O request from the host according to
the condition of mirroring consistency.
FICON IBM mainframe Fiber Optic Connection.
GB Gigabytes.
GLM Gigabyte link module.
HA High availability.
HBA Host bus adapter. A built-in function or a card installed in a PC or other host
computer to enable connection of the host to the SAN.
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.
hot standby Using two or more servers as a standby in case of a primary server failure.
HP Hewlett-Packard Development Company.
I/O Input/output (applies to an operation or device).
LAN Local area network.
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 often used synonymously with the term volume.
LED Light emitting diode.
local disk A disk in the host.
LU Logical unit.
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. See also Expanded LUN.
m Meters.
MB Megabytes.
MCU Main control unit.
MIX A circuit board in the disk control unit that includes disk adapters and channel
adapters for interfacing disk drives and the host to cache memory.
XP24000/XP20000 Disk Array Owner's Guide 59
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