IBM TotalStorage DS6000 Introduction And Planning Manual page 106

have a common model for the information
on a storage device. The programs must
be designed to handle the effects of
concurrent access.
shortwave laser adapter
A connector that is used between host
and DS6000 to support shortwave
fibre-channel communication.
SIM See service information message.
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).
(GC) See also management information
base.
simplex volume
A volume that is not part of a FlashCopy,
XRC, or PPRC volume pair.
Single-Byte Command Code Sets Connection
(SBCON)
The ANSI standard for the ESCON I/O
interface.
small computer system interface (SCSI)
A standard hardware interface that
enables a variety of peripheral devices to
communicate with one another. (GC)
smart relay host
A mail relay or mail gateway that has the
capability to correct e-mail addressing
problems.
SMIT See System Management Interface Tool.
SMP See symmetrical multiprocessor.
SNMP See Simple Network Management
Protocol.
SNMP agent
A server process that resides on a
network node and is responsible for
communicating with managers regarding
that node. The node is represented as a
managed object, which has various fields
or variables that are defined in the
appropriate MIB.
SNMP manager
A managing system that runs a managing
application or suite of applications. These
applications depend on Management
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Introduction and Planning Guide
Information Base (MIB) objects for
information that resides on the managed
system. Managers generate requests for
this MIB information, and an SNMP agent
on the managed system responds to
these requests. A request can either be
the retrieval or modification of MIB
information.
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.
source device
One of the devices in a dual-copy or
remote-copy volume pair. All channel
commands to the logical volume are
directed to the source device. The data on
the source device is duplicated on the
target device. See also target device.
spare A disk drive on the DS6000 that can
replace a failed disk drive. A spare can be
predesignated to allow automatic dynamic
sparing. Any data preexisting on a disk
drive that is invoked as a spare is
destroyed by the dynamic sparing copy
process.
spatial reuse
A feature of serial storage architecture that
enables a device adapter loop to support
many simultaneous read/write operations.
See also serial storage architecture.
SSID See subsystem identifier.
SSR See service support representative.
stacked status
For zSeries, the condition when the
control unit is in a holding status for the
channel, and the last time the control unit
attempted to present the status, the
channel responded with the stack-status
control.
stage operation
The operation of reading data from the
physical disk drive into the cache.
staging
To move 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.