Scan-edf
storage, algorithm
A variation of the Scan disk aceess algorithm for use in a real-time environment where, in general, requests are served according to Earliest Deadline First. If two requests share the same deadline, they may be reorganised according to Scan.
A typical example is a video server that retrieves video data from a hard disk. The playback of a video impose tight real-time constraints but if the server retrieves data once every second for each video channel, Scan-EDF can be applied, reducing the seek overhead.
(1995-11-15)
Read Also:
- Scanf
The C library routine that reads data from the standard input stream stdin into the locations given by each entry in its argument list. The first argument is a format string which controls interpretation of the input and each subsequent argument points to a variable with a type that corresponds to a type specifier in […]
- Scan line
hardware A horizontal line of pixels generated by a single horizontal sweep of the beam from a monitor’s electron gun. The number of scanlines that make up a frame is the vertical resolution. (1996-02-09)
- Scannable
verb (used with object), scanned, scanning. 1. to glance at or over or read hastily: to scan a page. 2. to examine the particulars or points of minutely; scrutinize. 3. to peer out at or observe repeatedly or sweepingly, as a large expanse; survey. 4. to analyze (verse) as to its prosodic or metrical structure; […]
- Scanned
verb (used with object), scanned, scanning. 1. to glance at or over or read hastily: to scan a page. 2. to examine the particulars or points of minutely; scrutinize. 3. to peer out at or observe repeatedly or sweepingly, as a large expanse; survey. 4. to analyze (verse) as to its prosodic or metrical structure; […]
- Scanner
noun 1. a person or thing that scans. 2. optical scanner. See under optical scanning. 3. Photography. any device for exposing an image on film, a sensitized plate, etc., by tracing light along a series of many closely spaced parallel lines. 4. (in aerial photography) a device for estimating the ratio of aircraft speed to […]