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公开(公告)号：BR9202160A
公开(公告)日：1993-02-02
申请号：BR9202160
申请日：1992-06-05
Applicant: IBM
Inventor： MENON JAISHANKAR M , MATSON RICHARD L , NG SPENCER WAH-FUNG
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Patent Agency Ranking
公开(公告)号：SG63745A1
公开(公告)日：1999-03-30
申请号：SG1997003201
申请日：1997-09-01
Applicant: IBM
Inventor： NG SPENCER WAH-FUNG
Abstract: A method for improving the response time of a data storage library of removable media is disclosed. The library includes a media storage rack with multiple slots (504) for storing data media, a storage drive (512) for writing data to or reading data from one of the media, a picker (510) for moving the media between the slots and the drive, and a destage slot physically close to the drive. The method comprises the steps of: moving a first medium from the drive to the destage slot, the first medium being one that was last accessed by the drive; moving a second medium from a slot holding the second medium to the drive, the second medium being the medium that will be accessed next by the drive; during the operation of the drive on the second medium, returning the first medium from the destage slot to the slot originally holding the first medium; and positioning the picker close to the drive. In another embodiment of the invention, the library additionally includes a prestage slot. The step of returning the first medium, while the drive is accessing the second medium, includes the step of moving a third medium from the storage rack to the prestage slot. The third medium being one that will be accessed by the drive, following the second medium.
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公开(公告)号：CA2063897C
公开(公告)日：1998-05-05
申请号：CA2063897
申请日：1992-03-24
Applicant: IBM
Abstract: A method and means in which data and parity blocks forming parity groups together with spare blocks are distributed over array block locations according to at least one combinatorial design, each group having N data and P parity blocks. The combinatorial designs yield uniform or balanced loading thereby minimizing the number of accesses to reconstruct missing data and parity blocks and their copyback into spare block locations, and, minimize the number of accesses to the reconstructed data referenced subsequent to its copyback. Distributions of the spare block capacity of one or two DASDs are shown over single and multiple arrays and shared among multiple arrays. Parity block distribution although ancillary to spare distribution enhances throughput and reduces the number of accesses for rebuild etc.
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公开(公告)号：BR9202158A
公开(公告)日：1993-02-02
申请号：BR9202158
申请日：1992-06-05
Applicant: IBM
Inventor： NG SPENCER WAH-FUNG , PALMER DAVID W , THOMPSON RICHARD S
Abstract: Fault tolerance in a redundant array 13 of disk drives 20, 21, 22, 23, 24 is degraded when errors exist in the array. Data in the array is rebuilt to remove the degradation, either for entire disk drives or for partial data, with minimal impact on array resources. Rebuilding occurs during idle time of the array or is interleaved between current data area accessing operations of the array at a rate which is inversely proportional to the activity level of the array. Alternatively, data is rebuilt when a data area being accessed is in need of rebuilding.
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