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:
Aug. 30, 2005
Filed:
Sep. 19, 2002
Peter W. Madany, Fremont, CA (US);
Peter W. Madany, Fremont, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
An apparatus and method for locating free data blocks in a microprocessor-based system for which snapshots are maintained. The snapshots are stored periodically, but only a subset of live snapshots is retained in order to reduce the total amount of storage needed for the snapshot information, such that their snapshot numbers are not sequential and there are gaps in the snapshot times. For each data block to be accessed, an allocation time and a deallocation time are stored in an allocation table. When a data block is needed, its allocation and deallocation times are compared with the live snapshot times to determine whether that data block is available. If not, the system iterates through the other data block allocation information until a free data block is located. If so, the system writes to that data block, and repeats the procedure as necessary to locate additional free data blocks.