IBM TotalStorage Installation Manual page 83

S
SAN. See storage area network.
SCSI. See Small Computer Systems Interface.
Small Computer System Interface (SCSI). A standard
hardware interface that enables a variety of peripheral
devices to communicate with one another.
SNMP. See Simple Network Management Protocol.
storage area network (SAN). A network whose
primary purpose is the transfer of data between
computer systems and storage elements and among
storage elements. A SAN consists of a communication
infrastructure, which provides physical connections,
and a management layer, which organizes the
connections, storage elements, and computer systems
so that data transfer is secure and robust. (S)
IBM Subsystem Device Driver (SDD). An IBM
pseudo device driver designed to support the
multipath configuration environments in IBM products.
U
uninterruptible power supply. A device connected
between a computer and its power source that protects
the computer against blackouts, brownouts, and power
surges. The uninterruptible power supply contains a
power sensor to monitor the supply and a battery to
provide power until an orderly shutdown of the system
can be performed.
V
valid configuration. A configuration that is supported.
VDisk. See virtual disk.
virtual disk (VDisk). In SAN Volume Controller, a
device that host systems attached to the storage area
network (SAN) recognize as a Small Computer System
Interface (SCSI) disk.
virtualization. In the storage industry, a concept in
which a pool of storage is created that contains several
disk subsystems. The subsystems can be from various
vendors. The pool can be split into virtual disks that
are visible to the host systems that use them.
virtualized storage. Physical storage that has
virtualization techniques applied to it by a
virtualization engine.
W
worldwide node name (WWNN). An identifier for an
object that is globally unique. WWNNs are used by
Fibre Channel and other standards.
worldwide port name (WWPN). A unique 64-bit
identifier associated with a fibre-channel adapter port.
The WWPN is assigned in an implementation- and
protocol-independent manner.
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Glossary