IBM DS8000 User Manual page 238

byte, multibyte, record, or block
increments across multiple disk drives.
subagent
An extension to an SNMP agent that
permits a user to dynamically add, or in
some cases replace, additional
management variables in the local MIB,
thereby providing a means of extending
the range of information that network
managers can access. See also agent.
subchannel
A logical function of a channel subsystem
associated with the management of a
single device.
subordinate storage unit
The physical unit that receives commands
from the master storage unit and is
specified when a Global Mirror session is
started. The subordinate storage unit
forms consistency groups and performs
other Global Mirror processing. A
subordinate storage unit can be controlled
by only one master storage unit. Contrast
with master storage unit.
subsystem identifier (SSID)
A number that uniquely identifies a
logical subsystem within a computer
installation.
support catcher
See catcher.
support catcher telephone number
The telephone number that connects the
support catcher server to the DS8000 to
receive a trace or dump package. See also
support catcher and remote technical
assistance information network.
switched fabric
A fibre-channel topology in which ports
are interconnected through a switch.
Fabric switches can also be interconnected
to support numerous ports on a single
network. See also arbitrated loop and
point-to-point connection.
symmetrical multiprocessor (SMP)
An implementation of a multiprocessor
computer consisting of several identical
processors configured in a way that any
subset of the set of processors is capable
of continuing the operation of the
computer. TheDS8000 contains four
processors set up in SMP mode.
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synchronous write
A write operation whose completion is
indicated after the data has been stored
on a storage device.
System/390
See S/390.
system adapter identification number (SAID)
The unique identification number that is
automatically assigned to each DS8000
host adapter for use by Copy Services.
System i
The IBM family of products which
includes the AS/400, eServer iSeries
eServer i5 and System i5 products.
System Management Interface Tool (SMIT)
An interface tool of the AIX operating
system for installing, maintaining,
configuring, and diagnosing tasks.
System Modification Program
A program used to install software and
software changes on MVS systems.
System p
The IBM family of products which
emphasizes performance and includes
™
System p5 , eServer p5, eServer pSeries
eServer OpenPower
System x
The IBM family of products which
emphasizes industry-standard server
scalability and self-managing server
technologies. It includes System x3nnn,
eServer xSeries, and AMD
processor-based eServer servers.
System z
The IBM family of products which
emphasizes near-zero downtime and
includes System z10, System z9, and
eServer zSeries.
System z storage
Storage arrays and logical volumes that
are defined in the DS8000 as connected to
System z products.
T
target A SCSI device that acts as a subordinate
to an initiator and consists of a set of one
or more logical units, each with an
assigned logical unit number (LUN). The
logical units on the target are typically
I/O devices. A SCSI target is analogous to
®
,
®
,
™ ®
, and RS/6000 .