Owner's manual

iSCSI Pronounced "eye-scuz zy", an acronym for Small Computer System Inter face
protocol over IP network instead of a d irect SCSI compatible cable which
enablesdatablockstoberead from orsentathighspeed to astorage device
such as a disk or tape drive
LAN A l ocal area network (LAN) is a group of computers and associated devices that
share a common communications line or wireless link a nd t ypically share the
resources of a single processor or server within a small g eographic area (for
example, within an office building).
library A storage device that handles multiple units of media and provides one or more
drives for reading and writing them, such as a phys ical tape library and virtual
tape library. Software emulation of a physical tape library is c alled a virtual
tape library. See also virtual tape library.
logical unit num-
ber
(LUN)
An address used in the SCSI protocol to access a device within a target. In the
case of the VLS, a LUN is assigned to e ach virtual library and tape drive.
LUN mapping A mechanism of changing the LUN assignments for a specifichost.
LUN masking An authorization process that makes a LUN available to some hosts and
unavailable to other hosts.
master ser ver A computer that provides administration and control for backup and restore
operations for a ll clients and servers in a master and media server cluster.
mean time until
data
loss (MTDL)
The average tim e until a component failure ca n be expected to cause data loss.
This includes the consideration that R AID redundancy can protect against data
loss from the failure of a single component.
media access con -
trol (MAC) address
A low-level unique hardware identifier for every Ethernet port in the world that
is
physically stored inside a network card or similar network interface. MAC
addresses are assigned by the IEEE.
media server A computer whose purpose is to move or copy data from one location to
another, such as from network clients to tape cartridges in a library.
MTBF Mean Time Between Failures. A statistic that predicts how often failures will
occur.
node In networks, a processing location. A node can b e a computer or some other
device, such as a printer. Every node has a unique network address.
oversubscription A condition that exists when more virtu a l media storage is configured on a
VLS than there is physical storage available. Because the VLS dynamically
allocates storage space as user data is written, the VLS allows you to allocate
more storage for virtual media than is physically available.
port mapping A mechanism of assigning a LUN (virtual device) , such as a virtual library or
tape drive, to a specific Fibre Channel host port. Port mapping allows you
to load-balance the LUNs among the Fibre Channel host ports to maximize
bandwidth. At this time, you must manually load -balance the virtual tape drives
in a
VLS.
power supply The computer component that supplies power to a computer. Most personal
computers can be plugged into standard electrical outlets. The power supply
then pulls the
required amount of electricity and converts the AC current to DC
current. It also regulates the voltage to eliminate spikes and surges common in
most electrical systems.
processor The part of a computer (a microprocessor chip) that does most of the data
processing; the CPU and the memory form the central part of a computer to
which the peripherals are attached.
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