IBM TotalStorage NAS 300 User Reference page 192

Peripheral Component Interconnect (PCI). A local bus for PCs from Intel that provides a high-speed data path
between the CPU and up to 10 peripherals (video, disk, network, and so on). The PCI bus coexists in the PC with the
industry standard architecture (ISA) or extended industry standard architecture (EISA) bus. ISA and EISA boards plug
into an ISA or EISA slot, while high-speed PCI controllers plug into a PCI slot.
Persistent Storage Manager (PSM). Columbia Data Products software that creates multiple, point-in-time,
persistent, TrueImage data views of any or all system and data volumes residing on network-attached storage. All
persistent images survive system power loss, or a planned or unplanned reboot. Each instance of PSM seamlessly
handles 250 concurrent images of up to 255 independent volumes for a total of 63 750 independent data images.
port. See socket.
PSM. See Persistent Storage Manager.
R
RAID. See redundant array of independent disks.
RAM. See random access memory.
random access memory (RAM). A temporary storage location in which the central processing unit (CPU) stores and
executes its processes. Contrast with direct access storage device (DASD).
redundant array of independent disks (RAID). A method of protecting data loss due to disk failure based on the
Redundant Array of Independent Disks specification published by the University of California in 1987. See also device
parity protection.
S
SAN. See storage area network.
SCSI. See small computer system interface.
server. In a network, a node that provides facilities to other stations; examples of servers are a file server, a printer
server, and a mail server.
shielded twisted pair (STP). A cable medium consisting of a telephone wire wrapped in a metal sheath to eliminate
external interference.
Simple Network Management Protocol (SNMP). In the Internet suite of protocols, a network management protocol
that is used to monitor routers and attached networks. SNMP is an application-layer protocol. Information on devices
managed is defined and stored in the application's Management Information Base (MIB).
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 dedicated storage network tailored to a specific environment, combining servers,
storage products, networking products, software, and services.
storage client network. A classic, interconnected, Fibre Channel fabric with a single, Fibre Channel, fabric name.
storage controller. A device (such as a RAID controller) that creates and manages other storage devices.
storage network. An arrangement that provides shared access to a set of logical unit numbers (LUNs) across one -
n storage client networks.
storage port. An engine's connection point to a storage client network. A storage port is a member of a single fabric.
See also engine.
storage unit. Hardware that contains one or more drive bays, power supplies, and a network interface. Some
storage units contain RAID controllers; their storage unit is accessed by the appliance.
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NAS Gateway 300 User's Reference