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Glossary-6 SilkWorm 3800 Hardware Reference
HBA
Host bus adapter. The interface card between a server or workstation bus and the
fibre channel network.
hub
A fibre channel wiring concentrator that collapses a loop topology into a physical
star topology. Nodes are automatically added to the loop when active and
removed when inactive.
idle
Continuous transmission of an ordered set over a fibre channel link when no data
is being transmitted, to keep the link active and maintain bit, byte, and word
synchronization.
initiator
A server or workstation on a fibre channel network that initiates communications
with storage devices. See also target.
integrated fabric
The fabric created by connecting multiple SilkWorm switches with multiple ISL
cables, and configuring the switches to handle traffic as a seamless group.
IOD
In-order delivery. A parameter that, when set, guarantees that frames are either
delivered in order or dropped.
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 trunking
The distribution of traffic over the combined bandwidth of multiple ISLs. A set of
trunked ISLs is called a trunking group, and the ports in a trunking group are
called a trunking ports. See also master port.
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.
IU
Information unit. A set of information as defined by either 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.
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.
kernel flash
Flash (temporary) memory connected to the peripheral bus of the processor, and
visible within the processor's memory space. Also known as “user flash”.
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 one of two modes:
•
Fabric mode: Connected to a port that is not loop capable, and using
fabric protocol.
•
Loop mode: In an arbitrated loop and using loop protocol. An L_Port in
loop mode can also be in participating mode or non-participating mode.
See also non-participating mode, participating mode.
latency
The period of time required to transmit a frame, from the time it is sent until it
arrives. Together, latency and bandwidth define the speed and capacity of a link or
system.
LED
Light emitting diode. Used to indicate status of elements on switch.
link
As applies to fibre channel, a physical connection between two ports, consisting
of both transmit and receive fibres. See also circuit.