MSA 2040 SMU Reference Guide

182 Glossary
host An external port that the storage system is attached 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.
image ID A globally unique serial number that identifies the point-in-time image source for a volume.
All volumes that have identical image IDs have identical data content, whether they be
snapshots or stand-alone volumes.
initiator See host.
I/O Manager A MIB-specific term for a controller module.
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 Input/output module. An IOM can be either a controller module or an expansion module.
IQN iSCSI Qualified Name.
iSCSI Internet SCSI interface protocol.
iSNS Internet Storage Name Service.
JBOD “Just a bunch of disks.” See drive enclosure.
jumbo frame In an iSCSI network, a frame that can contain 9000 bytes for large data transfers. A normal
frame can contain 1500 bytes.
large form factor See LFF.
LBA Logical Block Address. The address used for specifying the location of a block of data.
leftover The state of a disk that the system has excluded from a vdisk because the timestamp in the
disk’s metadata is older than the timestamp of other disks in the vdisk, or because the disk
was not detected during a rescan. A leftover disk cannot be used in another vdisk until the
disk’s metadata is cleared; for information and cautions about doing so, see documentation
topics about clearing disk metadata.
LFF Large form factor. A type of disk drive.
LIP Loop Initialization Primitive. An FC primitive used to determine the loop ID for a controller.
lock key A system-generated value that manages the encryption and decryption of data on
FDE-capable disks. See also FDE and passphrase.
logical block address See LBA.
Logical Unit Number See LUN.
loop See FC-AL.
Loop Initialization
Primitive
See LIP.
LUN Logical Unit Number. A number that identifies a mapped volume to a host.
MAC address Media Access Control Address. A unique identifier assigned to network interfaces for
communication on a network.
Management
Controller
See MC.
Management
Information Base
See MIB.
map/mapping Settings that specify whether a volume is presented as a storage device to a host, and how
the host can access the volume. Mapping settings include an access type (read-write,
read-only, or no access), controller host ports through which initiators may access the
volume, and a LUN that identifies the volume to the host. See also default mapping, explicit
mapping, and masking.