HP StorageWorks 2/64 - Core Switch, Command Reference Manual

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808 Glossary
iSCSI Internet Small Computer Systems Interface. A protocol that defines the processes for
transferring block storage applications over TCP/IP networks by encapsulating SCSI
commands into TCP and transporting them over the network via IP.
iSCSI Gateway
Service
The HP multiprotocol SAN routing service that maps the FCP protocol to the IP transport. This
service projects iSCSI hosts onto the backbone fabric of a gateway switch.
ISL Interswitch link. A Fibre Channel link from the E_Port of one switch to the E_Port of another. See
also cascade , E_Port .
ISL oversub-scription
ratio
The ratio of the number of free ports (non-ISL) to the number of ISLs on a switch.
isolated E_Port An E_Port that is online but not operational due to overlapping domain IDs or nonidentical
parameters (such as E_D_TOVs). See also E_Port .
ISP Internet service provider.
IU Information unit. A set of information as defined by either an upper-level process protocol
definition or upper-level protocol mapping.
JBOD ( Just a bunch of disks ) Indicates a number of disks connected in a single chassis to one or
more controllers. See also RAID .
jitter A deviation in timing for a bit stream as it flows through a physical medium.
K28.5 A special 10-bit character used to indicate the beginning of a transmission word that performs
Fibre Channel control and signaling functions. The first seven bits of the character are the
comma pattern. See also comma .
key A string of data (usually a numeric value) shared between two entities and used to control a
cryptographic algorithm. Usually selected from a large pool of possible keys to make
unauthorized identification of the key difficult. See also key pair .
key pair In public key cryptography, a pair of keys consisting of an entity's public and private key. The
public key can be publicized, but the private key must be kept secret. See also public key
cryptography .
L_Port Loop port. A node port (NL_Port) or fabric port (FL_Port) that has arbitrated-loop capabilities.
An L_Port can be in either Fabric Mode or Loop Mode.
LAN Local area network. A network in which transmissions typically take place over fewer than 5
kilometers (3.4 miles).
latency The time required to transmit a frame. Together, latency and bandwidth define the speed and
capacity of a link or system.
LED Light-emitting diode. Used to indicate the status of elements on a switch.
LIFA Loop-initialization fabric-assigned frame. Contains a bitmap of all fabric-assigned AL_PAs and
is the first frame transmitted in the loop initialization process after a temporary loop master has
been selected.
LIHA Loop-initialization hard-assigned frame. A hard-assigned AL_PA that is indicated by a bit set
and is the third frame transmitted in the loop initialization process after a temporary loop
master has been selected.
LILP Loop-initialization loop-position frame. The final frame transmitted in a loop initialization
process. A returned LIRP contains an accumulation of all of the AL_PA position maps. This
allows loop members to determine their relative loop position. This is an optional frame and is
not transmitted unless the LIRP is also transmitted.