SAN facilities over IP networks. This facilitates data sharing over a geographically distributed
enterprise.
FCoE
Fibre Channel over Ethernet. An encapsulation of Fibre Channel frames over Ethernet networks.
This allows Fibre Channel to use 10 Gigabit Ethernet networks while preserving the Fibre Channel
protocol. For more information, visit
www.fcoe.com
.
Fibre Channel
See
FC
.
Fibre Channel over
Ethernet
See
FCoE
.
G
GbE
Gigabit Ethernet.
H
heartbeat
A periodic synchronization signal issued by cluster software or hardware to indicate that a node
is an active member of the cluster. The MPX200 heartbeat LED blinks at a rate of once per second
during normal operation.
I
initiator
A media (host) server that runs the backup/restore application that passes commands and data
between the network and the VLS.
IP-SAN
Internet Protocol SAN.
IQN
iSCSI qualified name.
iSCSI
Internet small computer system interface. Transmits native SCSI over the TCP/IP stack. In a system
supporting iSCSI, a user or software application issues a command to store or retrieve data on
a SCSI storage device. The request is processed by the operating system and is converted to one
or more SCSI commands that are then passed to software or to a card. The command and data
are encapsulated by representing them as a serial string of bytes proceeded by iSCSI headers.
The encapsulated data is then passed to a TCP/IP layer that breaks it into packets suitable for
transfer over the network. If required, the encapsulated data can also be encrypted for transfer
over an insecure network.
ISL
Interswitch link.
iSNS
Internet Storage Name Service.
J
jumbo frame
In an iSCSI network, a frame that can contain 9000 bytes for large data transfers. A normal
frame can contain 1500 bytes.
K
keyword
An identifier that has a particular meaning to the command.
L
lossless
A class of data compression algorithms that allows the exact original data to be reconstructed
from compressed data.
lossy
A class of data compression algorithms that allows an approximation of original data to be
reconstructed from compressed data.
LUN
Logical unit number. Representation of a logical address on a peripheral device or array of
devices.
LVM
Logical Volume Manager.
252 Glossary