초록 ▼

A data access control system for reading/writing data from/to an array of storage units, which is resilient to read/writing errors to avoid lost data, while meeting the realtime requirements. Consecutive data blocks are stored in a plurality of storage units in a distributed manner by using a stripi

A data access control system for reading/writing data from/to an array of storage units, which is resilient to read/writing errors to avoid lost data, while meeting the realtime requirements. Consecutive data blocks are stored in a plurality of storage units in a distributed manner by using a striping technique. A time slot vacancy monitor checks the present activities of the storage units to find a vacant time slot during which no data read/write operations are scheduled. A data read/write controller finds a particular data block that is scheduled to be read out of/written the storage units just after the vacant time slot has expired. When such a data block is found, the data read/write controller prefetches that data block during the vacant time slot. If a read/write error is encountered during the prefetch of the data block, the data read/write controller attempts read/write retry operations in the remaining period of the vacant time slot until the scheduled data output time comes. This read/write retry operation will be repeated, if necessary, within the limited time period.

대표청구항 ▼

[ What is claimed is:] [1.] A data access control system for sequentially reading out a plurality of data blocks from a plurality of storage units, and transferring each data block through a single data transmission channel within a scheduled output time period, the plurality of storage units being

[ What is claimed is:] [1.] A data access control system for sequentially reading out a plurality of data blocks from a plurality of storage units, and transferring each data block through a single data transmission channel within a scheduled output time period, the plurality of storage units being disposed on the single data transmission channel to store the plurality of data blocks in a distributed manner, the data access control system comprising:vacancy monitoring means for finding a vacant time slot available in each of the storage units, the vacant time slot being a time period during which no data read operations are scheduled; anddata read control means for finding a particular data block that is scheduled to be read out just after the vacant time slot detected by said slot vacancy monitoring means has expired, prefetching the particular data block during the vacant time slot, and if a read error is encountered during the prefetch of the particular data block, conducting read retry operations until the scheduled output time period comes.