System and method for servicing inquiry commands about target devices in ...

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(12) United States Patent

Dale et al.

(io) Patent No.: (45) Date of Patent:

US 7,904,539 B2 Mar. 8, 2011

(54) SYSTEM AND METHOD FOR SERVICING INQUIRY COMMANDS ABOUT TARGET DEVICES IN STORAGE AREA NETWORK

(75) Inventors: Stephen G. Dale, Dripping Springs, TX (US); Bradfred W. Culp, Greeley, CO (US)

(73) Assignees: Crossroads Systems, Inc., Austin, TX (US); Hewlett-Packard Company, Palo Alto, CA (US)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 126 days.

(21) Appl.No.: 12/403,971

(22) Filed: Mar. 13, 2009

(65) Prior Publication Data

US 2009/0177840 Al Jul. 9, 2009

Related U.S. Application Data

(62) Division of application No. 10/064,080, filed on Jun. 10, 2002, now Pat. No. 7,603,449.

(51) Int. CI.

G06F15/173 (2006.01)

(52) U.S. CI 709/223; 709/203; 709/224; 709/238

(58) Field of Classification Search 709/201 203,

709/223-226, 238 See application file for complete search history.

(56) References Cited

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5,870,561 A 2/1999 Jarvisetal.
5,991,391 A 11/1999 Miloslavsky

Inquiry data received from sequential target devices is stored in a cache memory. In one embodiment, the cache memory is coupled to a router. In one embodiment, when the router receives from a host an inquiry command about a target, the router first checks to see if the inquiry command can be serviced from the cache. If so, the inquiry data about the target is retrieved from the cache and returned to the host. If not, the router checks to see if the target is busy. If not busy, the router routes the inquiry command to the target and stores the inquiry data returned by the target in the cache. If the target is busy, the router places the inquiry command in a queue. When the target becomes available, the router forwards the inquiry command to the target for processing, thereby keeping the inquiry command from timing out.

17 Claims, 6 Drawing Sheets

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