IBM 201 manual PSM see Persistent Storage Manager, RAID see redundant array of independent disks

PSM (see Persistent Storage Manager).

Q

QoS. Quality of service.

R

RAID (see redundant array of independent disks).

RAID-5.The RAID method used by the high-performance models of the IBM 9337 Disk Array Subsystem. See redundant array of independent disks and device parity protection.

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.

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 device parity protection and RAID-5.

remote procedure call (RPC). A facility that a client uses to request the execution of a procedure call from a server. This facility includes a library of procedures and an external data representation.

S

Samba. A UNIX implementation of CIFS that enables Windows networking-file-system protocol to communicate with UNIX operating systems.

SAN. Storage Area Network.

SCSI (see small computer system interface).

shared LAN. A LAN in which the total bandwidth is shared among all nodes attached to the LAN segment.

shared RAM. Shared memory provided by an adapter with onboard memory and requiring use of system CPU.

shielded twisted pair (STP). A cable medium consisting of a telephone wire wrapped in a metal sheath to eliminate external interference.

Simple Mail Transfer Protocol (SMTP). In the Internet suite of protocols, an application protocol for transferring mail among users in the Internet environment. SMTP specifies the mail exchange sequences and message format. It assumes that the Transmission Control Protocol (TCP) is the underlying protocol.

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).

single system image (SSI). A system architecture in which a cluster of engines provides an external view of the system such that it appears as a single entity in terms of administration, client-side attachment or both.

single-mode optical fiber. An optical fiber in which only the lowest-order bound mode (which can consist of a pair of orthogonally polarized fields) can propagate at the wavelength of interest. Contrast with multimode optical fiber.

single-route broadcast. The forwarding of specially designated broadcast frames only by bridges which have single-route broadcast enabled. If the network is configured correctly, a single-route broadcast frame will have exactly one copy delivered to every LAN segment in the network. Synonym for limited broadcast.

small computer system interface (SCSI). A standard hardware interface that enables a variety of peripheral devices to communicate with one another.

SMTP (see Simple Mail Transfer Protocol).

120NAS 200 User’s Reference