Hitachi 9900 Series - Manual (Page 77)

SCSI
Small Computer System Interface. An intelligent bus-level interface that defines a
standard I/O bus and a set of high-level I/O commands. There are currently many
flavors of SCSI defined by different bus widths and clock speeds. The seven major
variations of SCSI are SCSI 1, SCSI 2 (Fast/Narrow), SCSI 2 (Fast/Wide), Ultra SCSI
(Fast/Narrow), Ultra SCSI (Fast/Wide) – also called SCSI 3, Ultra 2 SCSI (Narrow),
Ultra 2 SCSI Wide. See also Fibre Channel.
Snapshot
A term that refers to a copy of a file system at a certain point in time. Snapshots are
used for backup and recovery.
SNMP
Simple Network Management Protocol. SNMP is a protocol used for communication
between simple, server-resident SNMP agents that respond to network administration
requests from simple-to-sophisticated SNMP manager tools running on remote
workstations.
Solaris
Sun’s UNIX ® operating system based on System V, release 4.
SPARC
Scalable Processor Architecture. SPARC International’s specification for
Reduced-Instruction-Set-Computer (RISC) CPUs.
Stripe
In RAID terminology, a stripe is when data is read or written in parallel to or from
multiple disks instead of reading or writing all data to one disk. Striping provides
much higher performance through its parallel design.
SVP
Service Processor of the Lightning 9900 ™ Series.
SWAN
Storage Wide Area Networks (SWANs) are interconnected SANs over long distances.
They are made possible by Fibre Channel and ESCON extenders.
Switch
In networking terminology, a switch is a computing device that filters and forwards
packets between Local Area Network (LAN) segments. Switches operate at the data
link layer (layer 2) of the OSI Reference Model and therefore support any packet
protocol. A special type of switch called an L4 switch operates at the fourth layer
(Transport Layer) of the OSI Reference Model and is responsible for the integrity of
data transmissions between LAN segments. LANs that use switches to join segments
are called switched LANs or, in the case of Ethernet networks, switched Ethernet
LANs. See also L-4 Switch.
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