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.
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
â„¢
, eServer p5, eServer pSeries
®
,
eServer OpenPower
â„¢
, and RS/6000
®
.
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
210 DS8000 User’s Guide
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