Table of Contents
Advertisement
performance events. Events related to thresholds set
on SAN performance.
polling delay. The time in seconds between
successive discovery processes during which Discovery
is inactive.
port. The hardware entity that connects a device to a
Fibre Channel topology. A device can contain one or
more ports.
portable document format (PDF). A standard
specified by Adobe Systems, Incorporated, for the
electronic distribution of documents. PDF files are
compact; can be distributed globally by e-mail, the Web,
intranets, or CD-ROM; and can be viewed with the
Acrobat Reader, which is software from Adobe Systems
that can be downloaded at no cost from the Adobe
Systems home page.
private loop. A freestanding Arbitrated Loop with no
fabric attachment.
program temporary fix (PTF). A temporary solution or
bypass of a problem diagnosed by IBM in a current
unaltered release of the program.
PTF. See program temporary fix.
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.
RDAC. See redundant disk array controller.
read-only memory (ROM). Memory in which the user
cannot changed stored data except under special
conditions.
red, green, blue (RGB). (1) Color coding in which the
brightness of the additive primary colors of light, red,
green, and blue are specified as three distinct values of
white light. (2) Pertaining to a color display that accepts
signals that represent red, green, and blue.
redundant disk array controller (RDAC). (1) In
hardware, a redundant set of controllers (either
active/passive or active/active). (2) In software, a layer
that manages the input/output (I/O) through the active
controller during normal operation and transparently
reroutes I/Os to the other controller in the redundant set
if a controller or I/O path fails.
RGB. See red, green, blue.
ROM. See read-only memory.
router. A computer that determines the path of
network traffic flow. The path selection is made from
several paths based on information obtained from
specific protocols, algorithms that attempt to identify the
76
IBM TotalStorageFAStT900 Fibre Channel Storage Server: User's Guide
shortest or best path, and other criteria such as metrics
or protocol-specific destination addresses.
SAN. See storage area network.
scope. Defines a group of controllers by their IP
addresses. You must create and configure a scope so
that dynamic IP addresses can be assigned to
controllers on your network..
SCSI. See small computer system interface.
segmented loop ports (SL_Ports). SL_Ports allow
you to divide a Fibre Channel Private Loop into multiple
segments. Each segment can pass frames around as
an independent loop and can connect through the fabric
to other segments of the same loop.
serial storage architecture (SSA). An interface
specification from IBM in which devices are arranged in
a ring topology. SSA, which is compatible with SCSI
devices, allows full-duplex packet multiplexed serial data
transfers at rates of 20Mb/sec in each direction.
server. A functional hardware and software unit that
delivers shared resources to workstation client units on
a computer network.
server/device events. Events that occur on the server
or a designated device that meet criteria that the user
sets.
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).
SL_Port. See segmented loop ports.
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.
SNMPv1. The original standard for SNMP is now
referred to as SNMPv1, as opposed to SNMPv2, a
revision of SNMP. See also Simple Network
Management Protocol.
SNMP time-out. The maximum amount of time the
SANavigator tool will wait for a device to respond to a
request. The specified time applies to one retry only.
SNMP trap events. SNMP is based on a
manager/agent model. SNMP includes a limited set of
management commands and responses. The
management system issues messages that tell an agent
to retrieve various object variables. The managed agent
sends a Response message to the management
system. That message is an event notification, called a
Advertisement
Table of Contents
