Glossary
QX and QXS Setup Guide 207
field-
replaceable unit
See FRU.
FPGA Field-programmable gate array. An integrated circuit designed to be configured after
manufacturing.
FRU Field-replaceable unit. A part that can be removed and replaced by the user or support
technician without having to send the product to a repair facility.
HBA Host bus adapter. A device that facilitates I/O processing and physical connectivity between a
host and the storage system.
host An external port that the storage system is connected to. The external port may be a port in an
I/O adapter in a server, or a port in a network switch. Product interfaces use the terms host
and initiator interchangeably.
host port A port on a controller module that interfaces to a host computer, either directly or through a
network switch.
host bus
adapter
See HBA.
I/O module See IOM.
intrinsic
methods
Methods inherited from CIM and present in all classes such as getclass, createinstance,
enumerateinstances, and associatorNames in SMI-S.
IOM I/O module. An IOM can be either a controller module or an expansion module.
JBOD “Just a bunch of disks.” See also drive enclosure.
large form
factor
See LFF.
leftover The state of a drive that the system has excluded from a vdisk because the timestamp in the
drive’s metadata is older than the timestamp of other drives in the vdisk, or because the drive
was not detected during a rescan. A leftover drive cannot be used in another vdisk until the
drive’s metadata is cleared; for information and cautions about doing so, see documentation
topics about clearing drive metadata.
LFF Large form factor. A type of 3.5 inch drive.
Logical Unit
Number
See LUN.
loop FC-AL topology.
LUN Logical Unit Number. A number that identifies a mapped Volume to a host.
Management
Controller
See MC.
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