HP StorageWorks XP20000 Disk Array Site Preparation Guide (AE190-96002, September 2007)

HA High availability.
HBA H ost bus adapter. A built-in function or a ca rd installed in a PC or other h ost
computer to enable connection of the host to the SAN.
host mode Each port can be configuredfor aparticularhosttype. Thesemodes 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 ser ver 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 R AID gro
up 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 LD EV ID to a RAI D group. The size of the LUN is determined by the
emulation mode of the LD EV, 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 u nit th
at
includes disk adapters and channel
adapters for interfacing disk drives and the host to ca che m em ory.
mirroring consis-
tency
The consistency (usability) of data in a volume (for example, S-VOL).
mm Millimeters.
MR Magnetoresistive.
ms, msec Milliseconds.
mutual hot
standby system
Two ser vers that are poised to cover for each other if necessary.
NAS Network attached storage.
node Logically speaking, an environment where instances can be executed. Physically,
a
processor, which is an element of a cluster system.
NVS Nonvolatile storage.
OFC Open Fibre Control.
OLM Optical link module.
OS Operating system.
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