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Browse Prior Art Database

Direct Access Storage Device

IP.com Disclosure Number: IPCOM000115325D
Original Publication Date: 1995-Apr-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Kobayashi, K: AUTHOR [+3]

Abstract

Disclosed is a DASD (Direct Access Storage Device) invention which executes the saving or writing the access pattern during power on time of the device. When the DASD is powered on the next time, the DASD can execute the ahead reading according to the saved access pattern and can store the data in the buffer. In this way, the performance of the DASD during power on is improved.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Direct Access Storage Device

      Disclosed is a DASD (Direct Access Storage Device) invention
which executes the saving or writing the access pattern during power
on time of the device.  When the DASD is powered on the next time,
the DASD can execute the ahead reading according to the saved access
pattern and can store the data in the buffer.  In this way, the
performance of the DASD during power on is improved.

      The DASD device reads and writes data from and on a magnetic
disk.  But accessing data in this manner is slower compared to
conventional semiconductor memory.  DASD devices usually have a
semiconductor memory for improving the read or write performance.
And normally such systems have algorithms for executing the reading
ahead for improving the read performance.  But these algorithms are
not effective during the period of the system booting.  This
invention can improve the performance of the DASD during the system
booting by using the character of DASD, that is, the access pattern
during the system booting are almost the identical pattern in every
time.