Hitachi 9900 Series Hitachi Data Systems, Scsi, Snapshot, Snmp, Solaris, Sparc, Stripe, Swan

Hitachi Data Systems

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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