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SMP. See System Modification Program .
SNMP. See simple network management protocol .
software transparency. Criteria applied to a
processing environment that states that changes do not
require modifications to the host software in order to
continue to provide an existing function.
spare. A disk drive that is used to receive data from a
device that has experienced a failure that requires
disruptive service. A spare can be pre-designated to
allow automatic dynamic sparing. Any data on a disk
drive that you use as a spare is destroyed by the
dynamic sparing copy process.
SSA. See serial storage architecture .
SSA adapter. The adapter that connects stored data
on devices, such as disk drive modules for access and
control by the storage server. See serial storage
architecture .
SSID. See subsystem identifier .
SSR. See service support representative .
stacked status. In the ESA/390 architecture, the
condition when the control-unit is holding status for the
channel and the channel responded with the
stack-status control the last time the control-unit
attempted to present the status.
staging. The action of moving data from an offline or
low-priority device back to an online or higher priority
device, usually on demand of the system or on request
of the user.
STI. See self-timed interface .
storage complex. Multiple storage facilities.
storage controller. A physical unit that provides an
interface between one or more storage devices and a
host computer by providing the function of one or more
logical subsystems. The storage controller may provide
functions that are not provided by the storage device.
The storage controller has one or more clusters.
storage device. A physical unit that provides a
mechanism to store data on a given medium such that it
can be subsequently retrieved. See disk drive module .
storage facility. (1) A physical unit that consists of a
storage controller integrated with one or more storage
devices to provide storage capability to a host computer.
(2) A storage server and its attached storage devices.
storage server. A unit that manages attached storage
devices and provides access to the storage or
storage-related functions for one or more attached
hosts.
StorWatch Enterprise Storage Server Specialist.
The Web-based management interface to the IBM
Enterprise Storage Server.
striping. A technique that distributes data in bit, byte,
multibyte, record, or block increments across multiple
disk drives.
subchannel. A logical function of a channel subsystem
associated with the management of a single device.
subsystem identifier (SSID). A number that uniquely
identifies a logical subsystem within a computer
installation.
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support catcher telephone number. The telephone
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number that service personnel use to send heartbeat
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call-home records that are non-problem related, directly
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to the support catcher server rather than to the RETAIN
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catcher server. These records might include such
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information as a trace or a dump package.
synchronous write. A write operation that stores data
in cache and in nonvolatile storage (NVS). Later the
data is stored on a device, using normal destage
algorithms.
System Management Interface Tool (SMIT). An
interface tool of the AIX operating system for installing,
maintaining, configuring, and diagnosing tasks.
System Modification Program (SMP). A program
used to install software and software changes on MVS
systems.
T
target. A storage device to which information is
written.
TB. See terabyte .
TCP/IP. See Transmission Control Protocol/Internet
Protocol .
terabyte (TB). (1) For processor storage, real and
virtual storage, and channel volume, 2
627 776 bytes. (2) For disk storage capacity and
communications volume, 1 000 000 000 000 bytes.
thousands of power-on hours (KPOH). A unit of time
used to measure the mean time between failures
(MTBF).
time sharing option (TSO). An operating system
option, the option provides interactive time sharing from
remote terminals.
TPF. See transaction processing facility .
track. A unit of storage on a CKD device that can be
formatted to contain a number of data records. See
home address, track-descriptor record , and data record .
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or 1 099 511
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Glossary
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