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:
Oct. 18, 2016
Filed:
Feb. 07, 2015
International Business Machines Corporation, Armonk, NY (US);
Kevin J. Ash, Tucson, AZ (US);
Lokesh M. Gupta, Tucson, AZ (US);
Carol S. Mellgren, Tucson, AZ (US);
Alfred E. Sanchez, Tucson, AZ (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for reclaiming space in a journal is disclosed. In one embodiment, such a method includes identifying a plurality of ranks in a storage system. The method creates a destage wait list for each rank, where the destage wait list identifies metadata tracks to destage from a cache to the corresponding rank. The method dispatches one or more threads for each destage wait list. The threads destage metadata tracks identified in the destage wait lists from the cache to the corresponding ranks. In certain embodiments, the method moves metadata tracks to the destage wait lists only if performing such will not cause occupied space in the journal to fall below a low watermark. Once metadata tracks are destaged from the cache, the method releases, from the journal, entries associated with the destaged metadata tracks. A corresponding system and computer program product are also disclosed.