Dual disk system for causing optimal disk units to execute I/O r

Details Dual disk system for causing optimal disk units to execute I/O r Dual disk system for causing optimal disk units to execute I/O r

1994-03-23

1995-04-18

Kulik, Paul V.

Boots, shoes, and leggings

395575, 395650, 364DIG2, 3649439, 3649442, 3649591, 3649592, 364964, 3649547, 364966, 3649661, 3649665, G06F 1200

Patent

active

054086345

ABSTRACT:
In a dual disk system constituted by two disk units which have the identical data and are of the same type, the seek time required for each channel program queued in a corresponding I/O queue is calculated, and the total seek time obtained by adding each seek time and a predictive head position assumed when a finally queued channel program are stored in a memory. When a new I/O request channel program is generated, the seek time required for the new channel program is added to each total seek time. The seek time required for the new channel program is added to the total seek time of one of the disk units which has a lesser total seek time. In addition, the head position is updated to the predictive head position assumed when the new channel program is executed. The new channel program is queued in the I/O queue corresponding to the disk unit having the lesser total seek time.

REFERENCES:
patent: 3702006 (1972-10-01), Page
patent: 4415970 (1983-11-01), Swenson et al.
patent: 4425615 (1984-01-01), Swenson et al.
patent: 4633387 (1986-12-01), Hartung et al.
patent: 5088058 (1992-02-01), Salsburg
"Enhanced Disk Task Sequencing," IBM Technical Disclosure Bulletin, vol. 29 No. 5, Oct., 1986, pp. 1946-1948.
"Dynamically Maintained Command Chains," vol. 24 No. 12, May 1982, IBM Technical Disclosure Bulletin, pp. 6605-6606.
Iwanami, Operating System of Software Science 56, pp. 343-348 (Published Sep. 6, 1988).

Affiliated with

Also associated with

Rating

Dual disk system for causing optimal disk units to execute I/O r does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual disk system for causing optimal disk units to execute I/O r, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual disk system for causing optimal disk units to execute I/O r will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-73779