Glossary, Continued
Disk Striping A type of disk array mapping. Consecutive stripes of data are mapped
Disk Subsystem A collection of disks and the hardware that connects them to one or more host computers. The hardware can include an intelligent controller or the disks can attach directly to a host computer I/O a bus adapter.
Double Buffering A technique that achieves maximum data transfer bandwidth by constantly keeping two I/O requests for adjacent data outstanding. A software component begins a double- buffered I/O stream by issuing two requests in rapid sequence. Thereafter, each time an I/O request completes, another is immediately issued. If the disk subsystem is capable of processing requests fast enough, double buffering allows data to be transferred at the full- volume transfer rate.
Failed Drive A drive that has ceased to function or consistently functions improperly.
Fast SCSI A variant on the
Firmware Software stored in
FlexRAID Power Fail Option The FlexRAID Power Fail option allows a reconstruction to restart if a power failure occurs. This is the advantage of this option. The disadvantage is, once the reconstruction is active, the performance is slower because an additional activity is added.
Cont’d
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