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.

load balancing

A software feature that improves system
performance by balancing device access
between multiple ports for maximum
resource efficiency.

loop initialization process

See

LIP

loopback

Diagnostic tool that routes transmit data
through a loopback connector back to the
same adapter.

LUN

Logical unit number, a subdivision of a
SCSI target. It is the small integer handle
that differentiates an individual disk drive
or partition (volume) within a common
SCSI target device such as a disk array.
Technically, a LUN can be a single
physical disk drive, multiple physical disk
drives, or a portion (volume) of a single
physical disk drive. However, LUNs are
typically not entire disk drives but rather
virtual partitions (volumes) of a RAID set.

Using LUNs, the Fibre Channel host can
address multiple peripheral devices that
may share a common controller.

maintenance button

Multifunction momentary switch on the
front panel of the router.

management workstation

PC workstation used to manage routers
remotely by connecting to the routers
using the SANsurfer Router Manager or
CLI commands.

maximum transmission unit

See

MTU

media

Physical-layer information carriers. Fibre
Channel supports several different
physical media: copper, multimode optical,
and single-mode optical. All Fibre Channel
protocols are supported on all media.

MIB

Management information base. A set of
guidelines and definitions for SNMP
functions.

mid-plane

Located inside the iSR6200 chassis
between the blades and their corre-
sponding

PCM

s, the mid-plane connects

the removable power supply and the
iSR6200 blades.

MTU

Maximum transmission unit. Refers to the
size (in bytes) of the largest packet (IP
datagram) that a specified layer of a
communications protocol can transfer.