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244 Glossary
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Replacement Unit—A component or collection of components in a disk
subsystem that are always replaced as a unit when any part of the collection
fails. Typical replacement units in a disk subsystem includes disks, controller
logic boards, power supplies, and cables. Also called a hot spare.
SCSI—Small Computer System Interface. A processor-independent
standard for system-level interfacing between a computer and intelligent
devices, including hard disks, diskettes, CD drives, printers, scanners, etc.
SCSI can connect up to seven devices to a single adapter (or host adapter)
on the computer's bus. SCSI transfers eight or 16 bits in parallel and can
operate in either asynchronous or synchronous modes. The synchronous
transfer rate is up to 160 MB/s. SCSI connections normally use single ended
drivers, as opposed to differential drivers.
The original standard is now called SCSI-1 to distinguish it from SCSI-2
and SCSI-3, which include specifications of Wide SCSI (a 16-bit bus) and
Fast SCSI (10 MB/s transfer.) Ultra 160M SCSI is a subset of Ultra3 SCSI
and allows a maximum throughput of 160 MB/s, which is more than twice
as fast as Wide Ultra2 SCSI.
Service Provider—The Service Provider (SP) is a program that resides in the
desktop system or server and is responsible for all Desktop Management
Interface (DMI) activities. This layer collects management information
from products (whether system hardware, peripherals or software) stores
that information in the DMI database and passes it to management
applications as requested.
SNMP—Simple Network Management Protocol, the most widely used
protocol for communication management information between the
managed elements of a network and a network manager. SNMP focuses
primarily on the network backbone. The Internet standard protocol that
manages nodes on an Internet Protocol (IP) network.
Spanning—Array spanning by a logical drive combines storage space in two
arrays of hard drives into a single, contiguous storage space in a logical drive.
Logical drives can span consecutively numbered arrays that each consist of
the same number of hard drives. Array spanning promotes RAID level 1 to
RAID levels 10. See also Array Spanning, and Disk Spanning.
Spare—A hard drive available to back up the data of other drives.