The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2002
Filed:
Apr. 21, 2000
Randeep S. Bhatia, Plainfield, NJ (US);
Rakesh K. Sinha, Manville, NJ (US);
Chung-Min M. Chen, Basking Ridge, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A method of declustering data among a number of storage units, e.g., disks, to minimize response time for range queries. Data to be stored is identified in the form of a dataset, wherein the data is divided among uniform data blocks (x, y) and each data block is to be stored in one of a number (M) of storage units each of which has an associated seek time. M pairs (i, key ) are defined wherein i=0,1, . . . m−1 and key is the fractional part of 2i/(1+5). First components of the pairs are ordered according to an ascending order of the key values of the pairs, thus defining a permutation array A of size M. Another permutation array B is defined such that for i=0,1, . . . ,M−1 B[a(i)]=i, and data block (x,y) is assigned to storage unit (x−B[y mod M])mod M, wherein mod is the remainder function.