Browse Prior Art Database

Recalibrating Buffer Peripheral Systems

IP.com Disclosure Number: IPCOM000052787D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Cole, DC: AUTHOR [+3]

Abstract

Peripheral storage systems employ buffer stores for giving a virtual backing store status to a plurality of users. The activity of the users with respect to the plurality of buffer stores can require a balancing between the buffer stores, replacement control for replacing data in the buffer with data from a backing store for enhancing operation. When such load balancing/replacement occurs, based upon user activity, certain data may be purged from the buffer store. The result of such purging requires adjusting the backing store (the tape or disk) such that access to data in the backing store is enhanced. For example, the virtual position of a tape, as represented by data stored in the buffer, may include several blocks of data.

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Recalibrating Buffer Peripheral Systems

Peripheral storage systems employ buffer stores for giving a virtual backing store status to a plurality of users. The activity of the users with respect to the plurality of buffer stores can require a balancing between the buffer stores, replacement control for replacing data in the buffer with data from a backing store for enhancing operation. When such load balancing/replacement occurs, based upon user activity, certain data may be purged from the buffer store. The result of such purging requires adjusting the backing store (the tape or disk) such that access to data in the backing store is enhanced. For example, the virtual position of a tape, as represented by data stored in the buffer, may include several blocks of data. Purging those several blocks of data requires that the tape be repositioned for accessing the data that was requires that the tape be repositioned for accessing the data that was just purged from the buffer. In a similar manner, disks are recalibrated by identifying the sectors that are next available using a rotational position indicator (RPI).

A plurality of users transfer data with a backing store, such as a tape, disk, and so forth, through a plurality of buffer stores. Buffer stores have a directory look-aside table (DLAT) for addressing data stored in the respective buffers. As the users access the buffer stores, the activity input, such as number of accesses, delays in accessing buffers, and so...