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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).
SL_port. See segmented loop port.
SMagent. The DS4000 Storage Manager optional
Java-based host-agent software, which can be used on
Microsoft Windows, Novell NetWare, HP-UX, and
Solaris host systems to manage storage subsystems
through the host fibre-channel connection.
SMclient. The DS4000 Storage Manager client
software, which is a Java-based graphical user interface
(GUI) that is used to configure, manage, and
troubleshoot storage servers and storage expansion
enclosures in a DS4000 storage subsystem. SMclient
can be used on a host system or on a storage
management station.
SMruntime. A Java compiler for the SMclient.
SMutil. The DS4000 Storage Manager utility software
that is used on Microsoft Windows, HP-UX, and Solaris
host systems to register and map new logical drives to
the operating system. In Microsoft Windows, it also
contains a utility to flush the cached data of the
operating system for a particular drive before creating a
FlashCopy.
small computer system interface (SCSI). A standard
hardware interface that enables a variety of peripheral
devices to communicate with one another.
small form-factor pluggable (SFP). An optical
transceiver that is used to convert signals between
optical fiber cables and switches. An SFP is smaller
than a gigabit interface converter (GBIC). See also
gigabit interface converter.
SNMP. See Simple Network Management Protocol and
SNMPv1.
SNMP trap event. (1) (2) An event notification sent by
the SNMP agent that identifies conditions, such as
thresholds, that exceed a predetermined value. See
also Simple Network Management Protocol.
SNMPv1. The original standard for SNMP is now
referred to as SNMPv1, as opposed to SNMPv2, a
revision of SNMP. See also Simple Network
Management Protocol.
SRAM. See static random access memory.
SSA. See serial storage architecture.
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IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
static random access memory (SRAM). Random
access memory based on the logic circuit know as
flip-flop. It is called static because it retains a value as
long as power is supplied, unlike dynamic random
access memory (DRAM), which must be regularly
refreshed. It is however, still volatile, meaning that it can
lose its contents when the power is turned off.
storage area network (SAN). A dedicated storage
network tailored to a specific environment, combining
servers, storage products, networking products,
software, and services. See also fabric.
Storage Array Identifier (SAI or SA Identifier). The
Storage Array Identifier is the identification value used
by the DS4000 Storage Manager host software
(SMClient) to uniquely identify each managed storage
server. The DS4000 Storage Manager SMClient
program maintains Storage Array Identifier records of
previously-discovered storage servers in the host
resident file, which allows it to retain discovery
information in a persistent fashion.
storage expansion enclosure (EXP). A feature that
can be connected to a system unit to provide additional
storage and processing capacity.
storage management station. A system that is used
to manage the storage subsystem. A storage
management station does not need to be attached to
the storage subsystem through the fibre-channel
input/output (I/O) path.
storage partition. Storage subsystem logical drives
that are visible to a host computer or are shared among
host computers that are part of a host group.
storage partition topology. In the DS4000 Storage
Manager client, the Topology view of the Mappings
window displays the default host group, the defined host
group, the host computer, and host-port nodes. The
host port, host computer, and host group topological
elements must be defined to grant access to host
computers and host groups using logical drive-to-LUN
mappings.
striping. Splitting data to be written into equal blocks
and writing blocks simultaneously to separate disk
drives. Striping maximizes performance to the disks.
Reading the data back is also scheduled in parallel, with
a block being read concurrently from each disk then
reassembled at the host.
subnet. An interconnected but independent segment
of a network that is identified by its Internet Protocol (IP)
address.
sweep method. A method of sending Simple Network
Management Protocol (SNMP) requests for information
to all the devices on a subnet by sending the request to
every device in the network.
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