Installation guide

iSR6152 Intelligent Storage Router
Installation Guide
Glossary-4 ISR651103-00 C
generic port
See G_Port.
heartbeat LED
A chassis LED that indicates the router
status.
hot replaceable
Also known as hot swappable, this means
you can add new devices or remove
existing ones when the system is running.
IANA
Internet Assigned Numbers Authority
(IANA) is responsible for the global coordi-
nation of the DNS root, IP addressing, and
other Internet protocol resources.
initiator
System component, such as a network
interface card, that originates an I/O
operation.
Internet Assigned Numbers Authority
See IANA.
Internet Protocol
See IP.
Internet small computer system interface
See iSCSI.
IOCTL
Input/output control. A system call in
UNIX/Linux systems that allows an appli-
cation to control or communicate with a
device driver outside usual read/write
operations.
IP
Internet Protocol. A method by which data
is sent from one computer to another over
the Internet. IP specifies the format of
packets, also called datagrams, and the
addressing scheme.
iSCSI
Internet small computer system interface.
Protocol that encapsulates data into IP
packets to send over Ethernet connec-
tions.
iSNS
Internet simple name service is used for
discovery and management of IP-based
SANs.
jumbo frames
Large IP frames used in high-performance
networks to increase performance over
long distances. Jumbo frames generally
means 9,000 bytes for Gigabit Ethernet,
but can refer to anything over the IP MTU,
which is 1,500 bytes on an Ethernet.
L_Port
Loop port. Does arbitrated loop functions
and protocols. NL_Ports and FL_Ports are
examples of loop-capable ports. See
E_Port, F_Port, FL_Port, G_Port, N_Port,
NL_Port.
loop port
See loop port.
latency
A measure of how fast a transaction
travels through the router.
LIP
Loop initialization process. The initializa-
tion 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 transmis-
sion on the loop is suspended during a LIP.