Technical data

224 HP Surestore FC Switch 6164 Installation and Reference Guide
HBA Host Bus Adapter. Interface card between a server or workstation bus and
the fibre channel network. Similar to a network interface card.
Hub Fibre channel wiring concentrator that collapses loop topology into physical
star topology. Nodes are automatically added when active and removed when
inactive.
Idle Continuous transmission of an ordered set when no data is being transmitted
to maintain an active fibre channel link and bit, byte, and word
synchronization. See also Fill word.
IN_ID Initial identifier. The field in the CT_HDR where the port ID of the client
originator of a Fibre Channel Services request.
Initiator Server or workstation that initiates communications with storage devices
over a fibre channel network. See also Target.
IOD In Order Delivery. A parameter that, when set, guarantees that frames are
delivered in order if possible, otherwise frames are dropped.
IPA Initial process associator. An identifier associated with a process at an
N_Port.
ISL Interswitch Link. Fibre channel link from the E_Port of one switch to the
E_Port of another. See also E_Port, Cascade.
Isolated E_Port A port that is online but not operational between switches due to overlapping
domain ID or nonidentical parameters such as E_D_TOVs.
IU Information Unit. An individual set of information as defined by higher-level
process protocol definition, or upper-level protocol mapping.
JBOD Just a Bunch Of Disks. A number of disks connected in a single chassis to
one or more controllers. See also RAID.
K28.5 Special 10-bit character used to indicate beginning of transmission words
that perform fibre channel control and signaling functions. First seven bits
are comma pattern. See also Comma.
L_Port Loop Port. Node or fabric port that can use loop protocol or fabric protocol.
See also Nonparticipating mode, Participating mode.
Latency Time required to transmit a frame, from the time sent until time of arrival.