Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung PDF herunterladen (Seite 76)

G-18 DAC960PG and DAC960PJ Installation Guide

Offline: A SCSI disk drive is in a “offline” state if it is not present, if it is

present but not powered on, or if it failed to operate properly and was

“offline” by the controller. When the controller detects a failure on a disk, it

“kills” that disk by changing its state to “offline.” An “offline” SCSI drive

can also be present and powered on, but a SCSI drive in a “offline” state

does not participate in any I/O activity; no commands are issued to dead

drives.

Rebuild: A SCSI disk drive is in a “rebuild” state while it is in the process of

being rebuilt. During this process, data is regenerated and written to the disk

drive. This state is also referred to as “Write-Only” (WRO).

SCSI Interrupt Steering Logic (SISL)

Architecture that allows a RAID controller, such as AcceleRAID 150, 200 or

250, to implement RAID on a system board-embedded SCSI bus or a set of

SCSI busses.

SDRAM

Synchronous Dynamic Random Access Memory, a form of dynamic random

access memory (DRAM) that can be coordinated or synchronized to the

clock speed of the computer.

Segment Size

See Cache Line Size.

Sequential I/O

A type of read and write operation where entire blocks of data are accessed

one after another in sequence, as opposed to randomly.

Server

A computer program that provides and manages services to other computer

programs on the same or other computers. The computer that a server

program runs in is also frequently referred to as a server.

SES

SCSI Enclosure Services, a standard for SCSI access to services within an

enclosure containing one or more SCSI devices. For disk drives, power

supplies, cooling elements, and temperature sensors, the actions performed

are the same as for SAF-TE monitoring. If a UPS is connected to any

SES-monitored enclosures, and an AC failure or two minute warning is

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Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung Seite 76