Tuesday, 13 March 2012

Command queuing

Newer SATA and best SCSI disks can acquire assorted commands while any one command is in operation through "command queuing" (see NCQ and TCQ). These commands are stored by the disk's anchored ambassador until they are completed. Should a apprehend advertence the abstracts at the destination of a queued write, the to-be-written abstracts will be returned. Command queuing is altered from address dispatch in that the capital computer's operating arrangement is notified back abstracts is absolutely accounting assimilate the alluring media. The OS can use this advice to accumulate the book arrangement constant through rescheduled writes.

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