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. 15, 2013
Filed:
Feb. 18, 2010
Hiroshi Nasu, Yokohama, JP;
Hirokazu Ikeda, Yamato, JP;
Yoshiaki Eguchi, Yokohama, JP;
Toshimichi Kishimoto, Hadano, JP;
Hiroshi Nasu, Yokohama, JP;
Hirokazu Ikeda, Yamato, JP;
Yoshiaki Eguchi, Yokohama, JP;
Toshimichi Kishimoto, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Multiple types of storage devices which have different performance are appropriately allocated to multiple virtual volumes in accordance with the performance requirements of the respective virtual volumes. In cases where, among virtual volumesfor which response times have been specified, there is a [virtual volume] that has a shortage of pages to which SSDsshould be allocated and that does not satisfy the performance requirement when its Tier boundary value β is adjusted to Tier boundary value β' and, if unallocated pages as the pages to which SSDsshould be allocated do not exist, Tier boundary value γ or Tier boundary value α of another virtual volume is adjusted to Tier boundary value γ′ or the Tier boundary value α′, and pages to which SSDsare allocated are secured in the virtual volumefor which the Tier boundary value has been adjusted.