Title:
STORAGE SYSTEM HAVING SAS AS ITS BACKEND COMMUNICATION STANDARD
Document Type and Number:
WIPO Patent Application WO/2011/151861
Kind Code:
A1
Abstract:
A first communication path, which is coupled to a first controller and to a plurality of storage devices (PDEV), and a second communication path, which is coupled to a second controller and to these plurality of PDEVs are provided. Each communication path has a plurality of expanders coupled in series. In order to shorten the time during which the communication path is not used for I/O, either (A) the length of time for which I/O suppression is set for the communication path is shortened, or (B) the overall time it takes for processing other than I/O processing is shortened. In the (A), a determination as to whether or not the coupling between the expanders has been disconnected is made for the I/O-suppressed communication path, and in a case where the result of this determination is negative, a discover process is carried out after releasing the I/O suppression with respect to this communication path. In the (B), the number of command issue times of updating routing control information of the expander is reduced.
Inventors:
MIMATA YOSHIFUMI (JP)
OIKAWA YOSHIHIRO (JP)
OIKAWA YOSHIHIRO (JP)
Application Number:
PCT/JP2010/003696
Publication Date:
December 08, 2011
Filing Date:
June 02, 2010
Export Citation:
Assignee:
HITACHI LTD (JP)
MIMATA YOSHIFUMI (JP)
OIKAWA YOSHIHIRO (JP)
MIMATA YOSHIFUMI (JP)
OIKAWA YOSHIHIRO (JP)
International Classes:
G06F3/06
Foreign References:
| EP2096530A2 | 2009-09-02 | |||
| US20080005470A1 | 2008-01-03 | |||
| JP2008242872A | 2008-10-09 |
Attorney, Agent or Firm:
WILLFORT INTERNATIONAL (3 Kanda-Ogawamachi 3-chome, Chiyoda-ku, Tokyo 52, JP)
Download PDF:
Claims: