Title:
STORAGE APPARATUS AND METHOD OF COMPARING AN EXPECTED COMMUNICATION RATE BETWEEN A STORAGE CONTROLLER AND AN EXPANDER WITH AN OPERATIONAL CONNECTION RATE
Document Type and Number:
WIPO Patent Application WO/2012/120565
Kind Code:
A1
Abstract:
The present invention aims to improve the performance of a storage apparatus. A controller of a storage apparatus stores therein for each piece of information indicating a communication rate in association with identification of the information piece, and performs speed negotiation for setting a communication rate with an expander upon detecting that coupling to the expander via a communication path has been established. The expander transmits identification information associated with its own maximum communication rate to the controller. The controller acquires the maximum communication rate of the expander on the basis of the identification information, obtains an expected value of the communication rate with the expander on the basis of the maximum communication rate of the expander and the maximum communication rate of the controller, and compares the communication rate set by the speed negotiation with the expected value.
Inventors:
KUROKAWA MIDORI (JP)
NITTA TOSHIHIRO (JP)
NITTA TOSHIHIRO (JP)
Application Number:
PCT/JP2011/001377
Publication Date:
September 13, 2012
Filing Date:
March 09, 2011
Export Citation:
Assignee:
HITACHI LTD (JP)
KUROKAWA MIDORI (JP)
NITTA TOSHIHIRO (JP)
KUROKAWA MIDORI (JP)
NITTA TOSHIHIRO (JP)
International Classes:
G06F13/40; H04L12/40
Foreign References:
| US20080247420A1 | 2008-10-09 | |||
| US20070011373A1 | 2007-01-11 | |||
| US20060047908A1 | 2006-03-02 | |||
| JP2007256993A | 2007-10-04 |
Attorney, Agent or Firm:
ISSHIKI & CO. (12-7 Shinbashi 2-chome, Minato-k, Tokyo 04, JP)
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Claims: