IBM TotalStorage DS4500, User Manual

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premium feature is authorized, and data about the
premium feature. See also feature enable identifier .
private loop. A freestanding arbitrated loop with no
fabric attachment. See also arbitrated loop .
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 .
RAID. See redundant array of independent disks
(RAID) .
RAID level. An array’s RAID level is a number that
refers to the method used to achieve redundancy and
fault tolerance in the array. See also array, redundant
array of independent disks (RAID) .
RAID set. See array .
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 DASD .
RDAC. See redundant disk array controller .
read-only memory (ROM). Memory in which stored
data cannot be changed by the user except under
special conditions.
recoverable virtual shared disk (RVSD). A virtual
shared disk on a server node configured to provide
continuous access to data and file systems in a cluster.
redundant array of independent disks (RAID). A
collection of disk drives ( array ) that appears as a single
volume to the server, which is fault tolerant through an
assigned method of data striping, mirroring, or parity
checking. Each array is assigned a RAID level, which is
a specific number that refers to the method used to
achieve redundancy and fault tolerance. See also array,
parity check, mirroring, RAID level, striping .
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.
remote mirroring. Online, real-time replication of data
between storage subsystems that are maintained on
separate media. The Enhanced Remote Mirror Option is
a DS4000 premium feature that provides support for
remote mirroring. See also Global Mirroring , Metro
Mirroring .
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
shortest or best path, and other criteria such as metrics
or protocol-specific destination addresses.
RVSD. See recoverable virtual shared disk .
SAI. See Storage Array Identifier .
SA Identifier. See Storage Array Identifier .
SAN. See storage area network .
SATA. See serial ATA .
scope. Defines a group of controllers by their Internet
Protocol (IP) addresses. A scope must be created and
defined so that dynamic IP addresses can be assigned
to controllers on the network.
SCSI. See small computer system interface .
segmented loop port (SL_port). A port that allows
division of 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.
sense data. (1) Data sent with a negative response,
indicating the reason for the response. (2) Data
describing an I/O error. Sense data is presented to a
host system in response to a sense request command.
serial ATA. The standard for a high-speed alternative
to small computer system interface (SCSI) hard drives.
The SATA-1 standard is equivalent in performance to a
10 000 RPM SCSI drive.
serial storage architecture (SSA). An interface
specification from IBM in which devices are arranged in
a ring topology. SSA, which is compatible with small
computer system interface (SCSI) devices, allows
full-duplex packet multiplexed serial data transfers at
rates of 20 Mbps 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.
SFP. See small form-factor pluggable .
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).
Glossary
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