Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung PDF herunterladen (Seite 71)

Glossary

Manual No. 775012 G-13

Offline

A Logical Drive is in an “offline” state if no data can be read from it or

written to it. Offline does not apply to physical disk drives. System

commands issued to offline logical drives are returned with an error status;

no operations can be performed on offline logical drives. See also Logical

Drive States, Online, and Critical.

Online

A Logical Drive is in an “online” state if all of its participating SCSI drives

have power and are operational. See also Logical Drive States, Critical, and

Offline.

Parity

A method of providing complete data redundancy while requiring only a

fraction of the storage capacity of mirroring. The data and parity blocks are

divided between the disk drives in such a way that if any single disk drive is

removed or fails, the data on it can be reconstructed using the data on the

remaining disk drives. The parity data may exist on only one disk drive or be

distributed between all disk drives in a RAID group.

Parity Check

A function used to verify the integrity of data on a system drive. It verifies

that mirror or parity information matches the stored data on the redundant

arrays. If the parity block information is inconsistent with the data blocks,

the controller corrects the inconsistencies. See also Consistency Check.

PCI

Peripheral Component Interconnect, a standardized architecture that

provides a high-speed data path between peripherals and the CPU. PCI is a

high-performance, backplane interface, expansion slot architecture found on

PCs, Macintoshes, and UNIX workstations. PCI cards are portable across

hardware platforms with the help of various software drivers.

PCI Hot Plug

A feature that allows for the printed circuit board (PCB) to be replaced

without powering down the entire system—an essential feature in newer

PCI-based PCs. Mylex DAC960PG, DAC960PJ, AcceleRAID, and

eXtremeRAID products are all PCI Hot Plug compatible. See also Hot Plug.

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Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung Seite 71