Product specifications

B – Glossary
FC0051102-00 A B-3
IOCB IOCB stands for I/O Control Block. An IOCB is a command
structure in QLogic ISP architecture.
IP IP stands for Internet Protocol, a method and convention for
sending a single packet of data through a network, combined
with Transmission Control Protocol (TCP), as the basis of
most intranet and Internet communication. IP is the lower
connectionless layer that transmits a single packet of data to
an address that uniquely identifies the receiver. TCP is the
upper connection-oriented layer that disassembles the
message into packets on the sending end and reassembles
the packets (in the correct order) on the receiving end. IP
can be used on Fibre Channel to send messages around a
network, assuming that the endpoints support IP.
IPX/SPX IPX/SPX stands for Internetwork Packet eXchange/
Sequenced Packet eXchange. These are Netware
communications protocols. IPX traffic does not travel on
Fibre Channel.
LIP LIP stands for Loop Initialization Process. LIP is the
initialization process in an arbitrated loop that occurs when
the loop is powered up or a new device is added. One
function of a LIP is to assign addresses. All data transmission
on the loop is suspended during a LIP.
Loopback Loopback is a diagnostic tool where data is transmitted and
received by the QLA2xxx adapter.
LUN LUN stands for Logical Unit Number, the small integer
handle that identifies a portion of disk storage. A LUN may
consist of a single physical disk or many physical disks. A
physical disk may be broken into multiple LUNs.
LUN masking LUN masking is a software feature that assigns LUNs to
specific servers or hides LUNs from specific servers for
maximum access and availability control. This is a feature
in QLconfig.
Media Media are carriers of information. Fibre Channel supports
several different physical media: copper, multimode optical,
and single-mode optical, which differ mainly in the
maximum cable length. All Fibre Channel protocols are
supported on all media.