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:
Feb. 03, 2009
Filed:
Jul. 15, 2005
Yukie Hiratsuka, Kanagawa, JP;
Manabu Nishikawa, Kanagawa-ken, JP;
Yukie Hiratsuka, Kanagawa, JP;
Manabu Nishikawa, Kanagawa-ken, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Where realtime performance-critical processing is executed in parallel with data integrity-critical processing, embodiments of the invention improve the realtime performance by raising the data transfer efficiency for sequential access-dominant realtime processing. In one embodiment, if a non-realtime processing command is received while read-ahead is in progress for a realtime processing command, processing of the non-realtime processing command is not started until a certain amount of data is cached. In addition, in order to prevent the periodicity disturbance of realtime processing, when the processing of the non-realtime processing command is postponed, the read-ahead is continued maximally until the timestamp at which the next realtime processing command is expected to be issued.