IBM TotalStorage DS300 Best Practices Manual page 653

I/O group A group containing two SVC nodes
defined by the configuration process. The nodes in
the I/O group provide access to the vDisks in the I/O
group.
ICAT IBM Common Information Model [CIM] Agent
Technology.
iFCP See Internet Fibre Channel Protocol.
Internet Fibre Channel Protocol The Internet
Fibre Channel Protocol specification defines iFCP
as a gateway-to-gateway protocol for the
implementation of a Fibre Channel fabric in which
TCP/IP switching and routing elements replace
Fibre Channel components.
Internet Protocol A protocol used to route data
from its source to its destination in an Internet
environment.
Internet SCSI Internet SCSI encapsulates SCSI
commands into TCP packets; therefore enabling the
transport of I/O block data over IP networks.
IP Internet protocol.
iSCSI See Internet SCSI.
Isochronous Transmission Data transmission
which supports network-wide timing requirements. A
typical application for isochronous transmission is a
broadcast environment which needs information to
be delivered at a predictable time.
J
Java A programming language that enables
application developers to create object-oriented
programs that are very secure, portable across
different machine and operating system platforms,
and dynamic enough to allow expendability.
Java runtime environment The underlying,
invisible system on your computer that runs applets
the browser passes to it.
Java Virtual Machine The execution environment
within which Java programs run. The Java virtual
machine is described by the Java Machine
Specification which is published by Sun™
Microsystems. Because the Tivoli Kernel Services is
based on Java, nearly all ORB and component
functions execute in a Java virtual machine.
JBOD Just a Bunch Of Disks. A disk group
configured without the disk redundancy of the RAID
arrangement. When configured as JBOD, each disk
in the disk group is a rank in itself.
JRE See Java runtime environment.
JVM™ See Java Virtual Machine.
L
Latency A measurement of the time it takes to
send a frame between two locations.
Logical unit number (LUN) a unique identifier
used on a SCSI bus that enables it to differentiate
between up to eight separate devices (each of which
is a logical unit). This number provides a volume
identifier that is unique among all storage servers.
The LUN is synonymous with a physical disk drive or
a SCSI device. For disk subsystems such as the IBM
Enterprise Storage Server®, a LUN is a logical disk
drive. This is a unit of storage on the SAN which is
available for assignment or unassignment to a host
server.
Loop topology In a loop topology, the available
bandwidth is shared with all the nodes connected to
the loop. If a node fails or is not powered on, the loop
is out of operation. This can be corrected using a
hub. A hub opens the loop when a new node is
connected and closes it when a node disconnects.
See also Fibre Channel Arbitrated Loop and
arbitrated loop.
LUN See logical unit number.
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Glossary