Cisco Systems, Inc. and Quantum Corporation v. Crossroads Systems, Inc.
`CQ-1001 / Page 1 of 14
`
`

`

`US 7,051,147 132
`
`Page 2
`
`U.S. PATENT DOCUMENTS
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`CQ-1001 / Page 2 of 14
`
`CQ-1001 / Page 2 of 14
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`

`

`US 7,051,147 132
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`FOREIGN PATENT DOCUMENTS
`
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`GB
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`JP
`JP
`W0
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`
`0827059 A2
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`2297636 A
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`DIGITAL StorageWorks, HSZ70 Array Controller HSOF
`Version 7.0, CLI Reference Manual, pp. 1-156, Jul. 1997.
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`Block-Based Distributed File
`Systems, Anthony
`McGregor, Jul. 1997.
`Compaq StorageWorks HSG80 Array Controller ACS Ver-
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`Compaq StorageWorks HSG80 Array Controller ACS Ver-
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`1998.
`CRD-5500 SCSI RAID Controller User’s Manual CMD
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`Technology, Inc. pp. 1-1 to 6-25, revised Nov. 21, 1996.
`DIGITAL Storage Works, HSZ70 Array Controller, HSOF
`Version 7.0 EK-HSZ70-CG. A01, Digital Equipment Cor-
`poration, Maynard, Massachusetts.
`DIGITAL StorageWorks HSZ70 Array Controller HSOF
`Version 7.0 EK-HSZ270-RM. A01 CLI Reference Manual.
`
`DIGITAL StorageWorks HSZ70 Array Controller HSOF
`Version 7.0 EK-HSZ70-SV. A01, 1997.
`DIGITAL StorageWorks HSG80 Array Controller ACS Ver-
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`Fiber Channel storage interface for video-on—demand serv-
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`Gen5 S-Series XL System Guide Revision 1.01 by Chen,
`Jun. 18, 1905.
`Graphical User Interface for MAXSTRAT Gen5/Gen-S
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`High Performance Data transfers Using Network-Attached
`Peripherals at the national Storage Laboratory by Hyer, Feb.
`26, 1993.
`IFT—3000 SCSI to SCSI Disk array Controller Instruction
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`Implementing a Fibre Channel SCSI transport by Snively,
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`Misc. Reference Manual Pages, SunOS 5.09.
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`Petal: Distributed Virtual Disks, Edward K. Lee and
`Chandramohan A. Thekkath, ACM SIGPLAN Notices, vol.
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`from
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`tems, Windows IT PRO Article, Oct. 1997.
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`Digital Equipment Corporation, Nov. 10, 1997, published on
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`Copyright 1993 IEEE. pp. 251-256.
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`Summary Judgment filed Jun. 29, 2005. Case No. A-03-CV—
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`Party Requester: William A. Blake.
`Request for Ex Parte Reexamination for 6,425,035. Third
`Party Requester: Natu J. Patel.
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`21,
`(CROSS1120-8).
`Office Action dated Feb.
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`Office Action dated Aug.
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`Office Action dated Dec.
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`Offi ce Action dated Nov.
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`Office Action dated Jan.
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`
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`
`27,
`
`2001
`
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`
`11, 2000 for 09/354,682
`
`16,
`
`1999 for 09/354,682
`
`6,
`
`2002
`
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`
`10/023 ,786
`
`21,
`
`2003
`
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`CQ-1001 / Page 3 of 14
`
`CQ-1001 / Page 3 of 14
`
`

`

`US 7,051,147 132
`
`Page 4
`
`Ofiice Action in Ex Parte Reexamination 90/007,127, mailed
`Feb. 7, 2005.
`Reply to Ofiice Action Under Ex Parte Reexamination Dated
`Feb. 2, 2007 for 90/007,127 filed on Apr. 6, 2005.
`Reply to Ofi‘ice Action Under Ex Parte Reexamination Dated
`Feb. 2, 2007 for 90/007,125 and 90/007,317 filed on Apr. 6,
`2005.
`
`Ofiice Action in Ex Parte Reexamination 90/007,126, mailed
`Feb. 7, 2005.
`Reply to Ofiice Action Under Ex Parte Reexamination Dated
`Feb. 2, 2007 for 90/007,126 filed on Apr. 6, 2005.
`Ofiice Action in Ex Parte Reexamination 90/007,124, mailed
`Feb. 7, 2005.
`Ofiice Action in Ex Parte Reexamination 90/007,123, mailed
`Feb. 7, 2005.
`Reply to Ofiice Action Under Ex Parte Reexamination Dated
`Feb. 2, 2007 for 90/007,123 filed on Apr. 5, 2005.
`European Office Action issued Apr. 1, 2004 in Application
`No. 98966104.6-2413.
`
`Fiber Channel (FCS)/ATM Interworking: A Design Solution
`by Anzaloni, et a1.
`Copies of the following are on the attached CD-Rom.
`Defendant’s First Supplemental Trial Exhibit List, Cross-
`roads Systems, Inc., V. Chaparral Network Storage, Inc.,
`CA. No. A-OOCA-217-SS (W.D. Tex. 2001). (CD-Rom).
`Defendant’s Third Supplemental Trial Exhibit List, Cross-
`roads Systems, Inc. V. Pathlight Technology, Inc., CA. No.
`A-OOCA-248-SS (W.D. Tex. 2001) (CD-Rom).
`Defendant Chaparral Network Storage, Inc.’s First Supple-
`mental Trial Exhibit List (D1 through D271) (CD-ROM
`Chaparral Exhibits ExListiDef), Sep. 2, 2001.
`Plaintiffs Fourth Amended Trial Exhibit List, Crossroads
`Systems, Inc. V. Chaparral Network Storage, Inc, CA. No.
`A-OOCA-217-SS (W.D. Tex. 2001) (CD-Rom), Sep. 11,
`2001.
`
`Inc. V. Chaparral
`Trail Transcripts, Crossroads Systems,
`Network Storage, Inc., CA. No. A-OOCA-217-SS (W.D.
`Tex. 2001). (CD-Rom).
`Inc. V. Pathlight
`Trail Transcripts, Crossroads Systems,
`Technology, Inc., CA. No. A-00CA-248-SS (W.D. Tex.
`2001). (CD-Rom).
`Datasheet for CrossPoint 4100 Fibre Channel
`
`to SCSI
`
`Router (Dedek Ex 41 (ANCT 117-120)) (CD-ROM Chap-
`arral Exhibits D012).
`Symbios Logic- Software Interface Specification Series 3
`SCSI RAID Controller Software Release 02.xx (Engelbrecht
`Ex 2 (LSI 1421-1658))
`(CD-ROM Chaparral Exhibits
`D013), Dec. 3, 1997.
`Press Release- Symbios Logic to Demonstrate Strong Sup-
`port for Fibre Channel at Fall Comdex (Engelbrecht 12 (LSI
`2785-86)) (CD-ROM Chaparral Exhibits D016), NOV. 13,
`1996.
`
`OEM Datasheet on the 3701 Controller (Engelbrecht 13
`(LSI 01837-38)) (CD-ROM Chaparral Exhibits D017), Jun.
`17, 1905.
`Nondisclosure Agreement Between Adaptec and Crossroads
`Dated Oct. 17, 1996 (Quisenberry Ex 25 (CRDS 8196))
`(CD-ROM Chaparral Exhibits D020).
`Organizational Presentation on the External Storage Group
`(Lavan Ex 1
`(CNS 182242-25 5))
`(CD-ROM Chaparral
`Exhibits D021), Apr. 11, 1996.
`Bridge. C, Bridge Between SCSI-2 and SCSI-3 FCP (Fibre
`Channel Protocol) (CD-ROM Chaparral Exhibits P214).
`
`Bridge Phase II Architecture Presentation (Lavan Ex 2 (CNS
`182287-295)) (CD-ROM Chaparral Exhibits D022), Apr.
`12, 1996.
`Attendees/Action Items from Apr. 12, 1996 Meeting at BTC
`(Lavan Ex 3 (CNS 182241)) (CD-ROM Chaparral Exhibits
`D023), Apr. 12, 1996.
`Brooklyn Hardware Engineering Requirements Documents,
`ReVision 1.4 (Lavan Ex 4 (CNS 178188-211)) (CD-ROM
`Chaparral Exhibits D024) by Pecone, May 26, 1996.
`Brooklyn Single-Ended SCSI RAID Bridge Controller
`Hardware OEM Manual, ReVision 2.1 (Lavan EX 5 (CNS
`177169-191)) (CD-ROM Chaparral Exhibits D025), Mar.
`21, 1996.
`Coronado Hardware Engineering Requirements Document,
`ReVision 0.0 (Lavan Ex 7 (CNS 176917-932)) (CD-ROM
`Chaparral Exhibits D027) by O’Dell, Sep. 30, 1996.
`ESS/FPG Organization (Lavan Ex 8 (CNS 178639-652))
`(CD-ROM Chaparral Exhibits D028), Dec. 6, 1996.
`Adaptec MCS ESS Presents: Intelligent External I/O Raid
`Controllers “Bridge” Strategy (Lavan Ex 9 (CNS 178606-
`638)). (CD-ROM Chaparral Exhibits D029), Feb. 6, 1996.
`AEC-7313 Fibre Channel Daughter Board (for Brooklyn)
`Engineering Specification, ReVision 1.0 (Lavan Ex 10 (CNS
`176830-850)) (CD-ROM Chaparral Exhibits D030), Feb.
`27, 1997.
`Bill of Material (Lavan Ex 14 (CNS 177211-214)) (CD-
`ROM Chaparral Exhibits D034), Jul. 24, 1997.
`AEC-. 4412B, AEC-7412/B2 External RAID Controller
`Hardware OEM Manual, ReVision 2.0 (Lavan Ex 15 (CNS
`177082- 123)) (CD-ROM Chaparral Exhibits D035), Jun. 27,
`1997.
`
`Coronado II, AEC-7312A Fibre Channel Daughter (for
`Brooklyn) Hardware Specification, Revision 12 (Lavan Ex
`16 (CNS 177192-210))
`(CD-ROM Chaparral Exhibits
`D036) by Tom Yang, Jul. 18, 1997.
`AEC-44 12B, AEC7412/3B Extemal RAID Controller Hard-
`ware OEM Manual, ReVision 3.0. (Lavan Ex 17 (CNS
`177124-165)) (CD-ROM Chaparral Exhibits D037), Aug.
`25, 1997.
`Memo Dated Aug. 15, 1997 to AEC-7312A EValuation Unit
`Customers re: B001 Release Notes (Lavan Ex 18 (CNS
`182878-879» (CD-ROM Chaparral Exhibits D038).
`Brooklyn Main Board (ABS-0302) MES Schedule (Lavan
`Ex 19 (CNS 177759-763)) (CD-ROM Chaparral Exhibits
`D039), Feb. 11, 1997.
`News Release-Adaptec Adds Fibre Channel Option to its
`External RAID Controller Family (Lavan Ex 20 (CNS
`182932-934)) (CD-ROM Chaparral Exhibits D040), May 6,
`1997.
`
`AEC-4412B/7412B User’s Guide, ReV. A (Lavan Ex 21)
`(CD-ROM Chaparral Exhibits D041), Jun. 19, 1905.
`Data Book- AIC-7895 PCI Bus Master Single Chip SCSI
`Host Adapter (DaVies Ex 1 (CNS 182944-64)) (CD-ROM
`Chaparral Exhibits D046), May 21, 1996.
`Data Book- AIC-1160 Fibre Channel Host Adapter ASIC
`(DaVies Ex 2 (CNS 181800-825)) (CD-ROM Chaparral
`Exhibits D047), Jun. 18, 1905.
`(CNS 180969-
`Viking RAID Software (DaVies Ex 3
`181026)) (CD-ROM Chaparral Exhibits D048), Jun. 18,
`1 905.
`
`Header File with Structure Definitions (DaVies Ex 4 (CNS
`180009-018)) (CD-ROM Chaparral Exhibits D049), Aug. 8,
`1 99 6.
`
`CQ-1001 / Page 4 of 14
`
`CQ-1001 / Page 4 of 14
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`

`US 7,051,147 132
`
`Page 5
`
`C++ SourceCode for the SCSI Command Handler (Davies
`Ex 5 (CNS 179136-168)) (CD-ROM Chaparral Exhibits
`D050), Aug. 8, 1996.
`Header File Data Structure (Davies Ex 6 (CNS 179997-
`180008))
`(CD-ROM Chaparral Exhibits D051), Jan. 2,
`1997.
`
`SCSI Command Handler (Davies Ex 7 (CNS 179676-719))
`(CD-ROM Chaparral Exhibits D052), Jan. 2, 1997.
`Coronado: Fibre Channel to SCSI Intelligent RAID Con-
`troller Product Brief (Kalwitz Ex I (CNS 182804-805))
`(CD-ROM Chaparral Exhibits D053).
`Bill of Material (Kalwitz Ex 2 (CNS 181632-633» (CD-
`ROM Chaparral Exhibits D054), Mar. 17, 1997.
`Emails Dated Jan. 13-Mar. 31, 1997 from P. Collins to Mo
`re: Status Reports (Kalwitz Ex 3 (CNS 182501-511)) (CD-
`ROM Chaparral Exhibits D055).
`Hardware Schematics for the Fibre Channel Daughtercard
`Coronado (Kalwitz Ex 4 (CNS 181639-648)) (CD-ROM
`Chaparral Exhibits D056).
`Adaptec Schematics re AAC-340 (Kalwitz Ex 14 (CNS
`177215-251)) (CD-ROM Chaparral Exhibits D057).
`Bridge Product Line Review (Manzanares Ex 3 (CNS
`177307-336)) (CD-ROM Chaparral Exhibits D058).
`AEC Bridge Series Products-Adaptec External Controller
`RAID Products Pre-Release Draft, v.6 (Manzanares Ex 4
`(CNS 174632-653)). (CD-ROM Chaparral Exhibits D059),
`Oct. 28, 1997.
`Hewlett-Packard Roseville Site Property Pass for Brian
`Smith (Dunning Ex 14 (HP 489)
`(CD-ROM Chaparral
`Exhibits D078), Nov. 7, 1996.
`Distribution Agreement Between Hewlett-Packard and
`Crossroads (Dunning Ex 15 (HP 326-33) (CD-ROM Chap-
`arral Exhibits D079).
`HPFC-5000 Tachyon User’s Manuel, First Edition (PTI
`172419-839) (CD-ROM Chaparral Exhibits D084), May 1,
`1996.
`
`X3T10 994D7(Draft) Information Technology: SCSI-3
`Architecture Model, Rev. 1.8 (PTI 165977)
`(CD-ROM
`Chaparral Exhibits D087).
`X3T10 Project 1047D: Information Technology- SCSI-3
`Controller Commands (SCC), Rev, 6c (PTI 166400-546)
`(CD-ROM Chaparral Exhibits D088), Sep. 3, 1996.
`X3T10 995D- (Draft) SCSI-3 Primary Commands, Rev. 11
`(Wanamaker Ex 5 (PTI 166050-229)) (CD-ROM Chaparral
`Exhibits D089), Nov. 13, 1996.
`VBAR Volume Backup and Restore (CRDS 12200-202)
`(CD-ROM Chaparral Exhibits D099).
`Preliminary Product Literature for Infinity Commstor’s
`Fibre Channel
`to SCSI Protocol Bridge (Smith Ex 11;
`Quisenberry Ex 31 (SPLO 428-30) (CD-ROM Chaparral
`Exhibits D143), Aug. 19, 1996.
`Letter dated Jul. 12, 1996 from J. Boykin to B. Smith re:
`Purchase Order for Evaluation Units from Crossroads
`
`(Smith Ex 24) CRDS 8556-57) (CD-ROM Chaparral Exhib-
`its D144), Jul. 12, 1996.
`CrossPoint 4100 Fibre Channel to SCSI Router Preliminary
`Datasheet (Hulsey Ex 9 (CRDS 16129-130)) (CD-ROM
`Chaparral Exhibits D145), Nov. 1, 1996.
`
`CrossPoint 4400 Fibre Channel to SCSI Router Preliminary
`Datasheet (Bardach Ex. 9 Quisenberry Ex 33 (CRDS 25606-
`607)) (CD-ROM Chaparral Exhibits D153), Nov. 1, 1996.
`Fax Dated Jul. 22, 1996 from L. Petti
`to B. Smith re:
`Purchase Order from Data General
`for FC2S Fibre to
`
`Channel SCSI Protocol Bridge Model 11 (Smith Ex 25;
`Quisenberry Ex 23; Bardach Ex 11 (CRDS 8552-55;8558)
`(CD-ROM Chaparral Exhibits D155).
`Email Dated Dec. 20, 1996 from J. Boykin to B. Smith re:
`Purchase Order for Betas in Feb. and Mar. (Hoese Ex 16,
`Quisenberry Ex 25; Bardach Ex 12 (CRDS 13644-650)
`(CD-ROM Chaparral Exhibits D156).
`Infinitiy Commstor Fibre Channel Demo for Fall Comdex,
`1996 (Hoese Ex 15, Bardach Ex 13 (CRDS 27415) (CD-
`ROM Chaparral Exhibits D157).
`Fax Dated Dec. 19, 1996 from B. Bardach to T. Rarich re:
`Purchase Order Information (Bardach Ex. 14; Smith Ex 16
`(CRDS 4460)) (CD-ROM Chaparral Exhibits D158).
`Miscellaneous Documents Regarding Comdex (Quisenberry
`Ex 2 (CRDS 27415-465)) (CD-ROM Chaparral Exhibits
`D165).
`CrossPoint 4100 Fibre Channel to SCSI Router Preliminary
`Datasheet (Quisenberry) Ex 3 (CRDS 4933-34) (CD-ROM
`Chaparral Exhibits D166) (CD-ROM Chaparral Exhibits
`D166).
`CrossPoint 4400 Fibre to Channel to SCSI Router Prelimi-
`
`nary Datasheet; Crossroads Company and Product Over-
`view (Quisenberry Ex 4 (CRDS 25606; 16136)) (CD-ROM
`Chaparral Exhibits D167).
`Crossroads Purchase Order Log (Quisenberry Ex 9 (CRDS
`14061-062)) (CD-ROM Chaparral Exhibits D172).
`RAID Manager 5 with RDAC 5 for UNIX V.4 User’s Guide
`(LSI-01854) (CD-ROM Chaparral Exhibits P062), Sep. 1,
`1996.
`
`Letter dated May 12, 1997 from Alan G. Leal to Barbara
`Bardach enclosing the original OEM License and Purchase
`Agreement between Hewlett-Package Company and Cross-
`roads Systems, Inc. (CRDS 02057) (CD-ROM Chaparral
`Exhibits P130).
`CR4x00 Product Specification (CRDS 43929) (CD-ROM
`Chaparral Exhibits P267), Jun. 1, 1998.
`Symbios LogiciHardware Function Specification for the
`Symbios Logic Series 3 Fibre Channel Disk Array Control-
`ler Model 3701 (Engelbrecht Ex 3 (LSI-1659-1733) (CD-
`ROM Pathlight Exhibits D074).
`Report of the Working Group on Storage 1/O for Large Scale
`Computing; Department of Computer Science Duke Uni-
`versity: CS-1996-21
`(PTI
`173330-347).
`(CD-ROM
`Pathlight Exhibits D098).
`Brian Allison’s 1999 Third Quarter Sales Plan (PDX 38 )
`CNS 022120-132)) (CD-ROM Pathlight Exhibits D201),
`Jun. 5, 2001.
`Brooklyn SCSI-SCSI Intellegent External RAID Bridge
`Definition Phase External Documentation
`(CD-ROM
`Pathlight Exhibits D129).
`
`* cited by examiner
`
`CQ-1001 / Page 5 of 14
`
`CQ-1001 / Page 5 of 14
`
`

`

`US. Patent
`
`May 23, 2006
`
`Sheet 1 of 2
`
`US 7,051,147 B2
`
`
`
`
`
`65
`
`52
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`TORAGE DEVICE
`
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`WORKSTATION
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`55
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`58
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`60
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`A
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`52
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`54
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`
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`
`CQ-1001 / Page 6 of 14
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`CQ-1001 / Page 6 of 14
`
`

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`CQ-1001 / Page 7 of 14
`
`CQ-1001 / Page 7 of 14
`
`
`
`
`

`

`US 7,051,147 B2
`
`1
`STORAGE ROUTER AND METHOD FOR
`PROVIDING VIRTUAL LOCAL STORAGE
`
`RELATED APPLICATIONS
`
`This application is a continuation of and claims the benefit
`of the filing dates of US. patent application Ser. No.
`10/081,110 by inventors Geoffrey B. Hoese and Jeffry T.
`Russell, entitled “Storage Router and Method for Providing
`Virtual Local Storage” filed on Feb. 22, 2002, now US. Pat.
`No. 6,789,152 which in turn is a continuation of US.
`application Ser. No. 09/354,682 by inventors Geoffrey B.
`Hoese and Jeffry T. Russell, entitled “Storage Router and
`Method for Providing Virtual Local Storage” filed on Jul. 15,
`1999, now US. Pat. No. 6,421,753, which in turn is a
`continuation of US. patent application Ser. No. 09/001,799,
`filed on Dec. 31, 1997, now US. Pat. No. 5,941,972, and
`hereby incorporates these applications by reference in their
`entireties as if they had been fully set forth herein.
`
`TECHNICAL FIELD OF THE INVENTION
`
`to network storage
`This invention relates in general
`devices, and more particularly to a storage router and
`method for providing virtual local storage on remote SCSI
`storage devices to Fibre Channel devices.
`
`BACKGROUND OF THE INVENTION
`
`Typical storage transport mediums provide for a relatively
`small number of devices to be attached over relatively short
`distances. One such transport medium is a Small Computer
`System Interface (SCSI) protocol, the structure and opera-
`tion of which is generally well known as is described, for
`example, in the SCSI-1, SCSI-2 and SCSI-3 specifications.
`High speed serial interconnects provide enhanced capability
`to attach a large number of high speed devices to a common
`storage transport medium over large distances. One such
`serial interconnect is Fibre Channel, the structure and opera-
`tion of which is described, for example, in Fibre Channel
`Physical and signaling Interface (PC-PH), ANSI X3230
`Fibre Channel Arbitrated Loop (FC—AL), and ANSI X3272
`Fibre Channel Private Loop Direct Attach (FC—PLDA).
`Conventional computing devices, such as computer work-
`stations, generally access storage locally or through network
`interconnects. Local storage typically consists of a disk
`drive, tape drive, CD-ROM drive or other storage device
`contained within, or locally connected to the workstation.
`The workstation provides a file system structure,
`that
`includes security controls, with access to the local storage
`device through native low level, block protocols. These
`protocols map directly to the mechanisms used by the
`storage device and consist of data requests without security
`controls. Network interconnects typically provide access for
`a large number of computing devices to data storage on a
`remote network server. The remote network server provides
`file system structure, access control, and other miscellaneous
`capabilities that include the network interface. Access to
`data through the network server is through network proto-
`cols that the server must translate into low level requests to
`the storage device. A workstation with access to the server
`storage must translate its file system protocols into network
`protocols that are used to communicate with the server.
`Consequently, from the perspective of a workstation, or
`other computing device, seeking to access such server data,
`the access is much slower than access to data on a local
`
`storage device.
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`2
`SUMMARY OF THE INVENTION
`
`In accordance with the present invention, a storage router
`and method for providing virtual local storage on remote
`SCSI storage devices to Fibre Channel devices are disclosed
`that provide advantages over conventional network storage
`devices and methods.
`
`invention, a
`According to one aspect of the present
`storage router and storage network provide virtual
`local
`storage on remote SCSI storage devices to Fibre Channel
`devices. A plurality of Fibre Channel devices, such as
`workstations, are connected to a Fibre Channel transport
`medium, and a plurality of SCSI storage devices are con-
`nected to a SCSI bus transport medium. The storage router
`interfaces between the Fibre Channel transport medium and
`the SCSI bus transport medium. The storage router maps
`between the workstations and the SCSI storage devices and
`implements access controls for storage space on the SCSI
`storage devices. The storage router then allows access from
`the workstations to the SCSI storage devices using native
`low level, block protocol in accordance with the mapping
`and the access controls.
`
`According to another aspect of the present invention,
`virtual
`local storage on remote SCSI storage devices is
`provided to Fibre Channel devices. A Fibre Channel trans-
`port medium and a SCSI bus transport medium are inter-
`faced with. A configuration is maintained for SCSI storage
`devices connected to the SCSI bus transport medium. The
`configuration maps between Fibre Channel devices and the
`SCSI storage devices and implements access controls for
`storage space on the SCSI storage devices. Access is then
`allowed from Fibre Channel initiator devices to SCSI stor-
`
`age devices using native low level, block protocol in accor-
`dance with the configuration.
`A technical advantage of the present invention is the
`ability to centralize local storage for networked workstations
`without any cost of speed or overhead. Each workstation
`access its virtual local storage as if it work locally con-
`nected. Further,
`the centralized storage devices can be
`located in a significantly remote position even in excess of
`ten kilometers as defined by Fibre Channel standards.
`Another technical advantage of the present invention is
`the ability to centrally control and administer storage space
`for connected users without limiting the speed with which
`the users can access local data. In addition, global access to
`data, backups, virus scanning and redundancy can be more
`easily accomplished by centrally located storage devices.
`A further technical advantage of the present invention is
`providing support for SCSI storage devices as local storage
`for Fibre Channel hosts. In addition, the present invention
`helps to provide extended capabilities for Fibre Channel and
`for management of storage subsystems.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`A more complete understanding of the present invention
`and the advantages thereof may be acquired by referring to
`the following description taken in conjunction with the
`accompanying drawings, in which like reference numbers
`indicate like features, and wherein:
`
`FIG. 1 is a block diagram of a conventional network that
`provides storage through a network server;
`FIG. 2 is a block diagram of one embodiment of a storage
`network with a storage router that provides global access
`and routing;
`
`CQ-1001 / Page 8 of 14
`
`CQ-1001 / Page 8 of 14
`
`

`

`3
`
`4
`
`US 7,051,147 B2
`
`FIG. 3 is a block diagram of one embodiment of a storage
`network with a storage router that provides virtual local
`storage;
`FIG. 4 is a block diagram of one embodiment of the
`storage router of FIG. 3; and
`FIG. 5 is a block diagram of one embodiment of data flow
`within the storage router of FIG. 4.
`
`DETAILED DESCRIPTION OF THE
`INVENTION
`
`FIG. 1 is a block diagram of a conventional network,
`indicated generally at 10, that provides access to storage
`through a network server. As shown, network 10 includes a
`plurality of workstations 12 interconnected with a network
`server 14 via a network transport medium 16. Each work-
`station 12 can generally comprise a processor, memory,
`input/output devices, storage devices and a network adapter
`as well as other common computer components. Network
`server 14 uses a SCSI bus 18 as a storage transport medium
`to interconnect with a plurality of storage devices 20 (tape
`drives, disk drives, etc.). In the embodiment of FIG. 1,
`network transport medium 16 is an network connection and
`storage devices 20 comprise hard disk drives, although there
`are numerous alternate transport mediums and storage
`devices.
`
`In network 10, each workstation 12 has access to its local
`storage device as well as network access to data on storage
`devices 20. The access to a local storage device is typically
`through native low level, block protocols. On the other hand,
`access by a workstation 12 to storage devices 20 requires the
`participation of network server 14 which implements a file
`system and transfers data to workstations 12 only through
`high level file system protocols. Only network server 14
`communicates with storage devices 20 via native low level,
`block protocols. Consequently, the network access by work-
`stations 12 through network server 14 is slow with respect
`to their access to local storage. In network 10, it can Also be
`a logistical problem to centrally manage and administer
`local data distributed across an organization,
`including
`accomplishing tasks such as backups, Virus scanning and
`redundancy.
`FIG. 2 is a block diagram of one embodiment of a storage
`network, indicated generally at 30, with a storage router that
`provides global access and routing. This environment is
`significantly different from that of FIG. 1 in that there is no
`network server involved. In FIG. 2, a Fibre Channel high
`speed serial transport 32 interconnects a plurality of work-
`stations 36 and storage devices 38. A SCSI bus storage
`transport medium interconnects workstations 40 and storage
`devices 42. A storage router 44 then serves to interconnect
`these mediums and provide devices on either medium glo-
`bal,
`transparent access to devices on the other medium.
`Storage router 44 routes requests from initiator devices on
`one medium to target devices on the other medium and
`routes data between the target and the initiator. Storage
`router 44 can allow initiators and targets to be on either side.
`In this manner, storage router 44 enhances the functionality
`of Fibre Channel 32 by providing access, for example, to
`legacy SCSI storage devices on SCSI bus 34. In the embodi-
`ment of FIG. 2, the operation of storage router 44 can be
`managed by a management station 46 connected to the
`storage router Via a direct serial connection.
`In storage network 30, any workstation 36 or workstation
`40 can access any storage device 38 or storage device 42
`through native low level, block protocols, and vice versa.
`This functionality is enabled by storage router 44 which
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`routes requests and data as a generic transport between Fibre
`Channel 32 and SCSI bus 34. Storage router 44 uses tables
`to map devices from one medium to the other and distributes
`requests and data across Fibre Channel 32