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:
Sep. 16, 2003
Filed:
Jun. 09, 2000
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and system are disclosed to prevent significant degradation of a data transfer rate in write cache transfer, thereby keeping the minimum data transfer rate high. The initial value T of the virtual buffer full capacity T(t ) is set to F/N (where F is a data capacity of the buffer, and N>1) and it is determined if the amount of write cached data S(t ) reaches the virtual buffer full capacity T(t ) so that write cache transfer is enabled during an S(t )<T(t ) period and if virtual buffer full (S(t )=T(t )) is satisfied, the write cache transfer is inhibited until S(t )<T(t ) is satisfied and the virtual buffer full capacity T(t ) is increased by a predetermined value K from the current one each time disk writing is stopped (each time a write error occurs) while the virtual buffer full is continued, thereby enabling write cache transfer while disk writing is stopped.