PTO/SB/05 (07-07)
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`U.S. Patent and Trademark Office. U.S. DEPARTMENT OF COMMERCE
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`Attorney Docket No.
`
`CROSS1120-33
`
`UTILITY
`PATENT APPLICATION
`TRANSMITTAL
`(Only for new nonprovisional applications under 37 CFR 1.53(b))
`
`First Inventor
`
`Title
`
`Geoffrey B. Heese
`
`Storage Router and Method for ...
`
`Express Mail Label No. N/A
`
`~
`
`APPLICATION ELEMENTS
`See MPEP chapter 600 concerning utility patent application contents.
`
`ADDRESS TO:
`
`Commissioner for Patents
`P.O. Box 1450
`Alexandria VA 22313-1450
`
`r
`
`"
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`2.0
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`1.[{] Fee Transmittal Form (e.g., PTO/SB/17)
`(Submit an original and a duplicate for fee processing)
`Applicant claims small entity status.
`See 37 CFR 1.27.
`[Total Pages
`25
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`name in the prior application, see 37 CFR
`1.63(d)(2) and 1.33(b).
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`(Should be specifically itemized)
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`Applicant must attach form PTO/SB/35 or equivalent.
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`specification following the title, or in an Application Data Sheet under 37 CFR 1. 76:
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`Continuation-in-part (CIP)
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`of prior application No.: 12/552,885 ................
`
`Examiner Unknown
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`Art Unit: 2181
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`Change in Power of Attorne}!
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`I .f I The address associated with Customer Number: I
`
`44654
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`I OR D Correspondence address below
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`Zip Code
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`Email
`
`1 Date January 20, 201 0
`Registration No. I
`. (Attornev/Aaent) 48•828
`
`This collection of information is required by 37 CFR 1.53(b). The information is required to obtain or retain a benefit by the public which is to file (and by the
`USPTO to process) an application. Confidentiality is governed by 35 U.S.C. 122 and 37 CFR 1.11 and 1.14. This collection is estimated to take 12 minutes to
`complete, including gathering, preparing, and submitting the completed application form to the USPTO. Time will vary depending upon the individual case. Any
`comments on the amount of time you require to complete this form and/or suggestions for reducing this burden, should be sent to the Chief Information Officer,
`U.S. Patent and Trademark Office, U.S. Department of Commerce, P.O. Box 1450, Alexandria, VA 22313-1450. DO NOT SEND FEES OR COMPLETED
`FORMS TO THIS ADDRESS. SEND TO: Commissioner for Patents, P.O. Box 1450, Alexandria, VA 22313-1450.
`If you need assistance in completing the form, ca/11-800-PT0-9199 and select option 2.
`
`Oracle Ex. 1002, pg. 1
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`1
`
`STORAGE ROUTER AND METHOD FOR PROVIDING
`
`VIRTUAL LOCAL STORAGE
`
`TECHNICAL FIELD OF THE INVENTION
`
`[0001]
`
`This application is a continuation of, and claims a benefit of priority under 35
`
`U.S.C. 120 of the filing date of U.S. Patent Application Serial No. 12/552,885
`
`entitled "Storage Router and Method for Providing Virtual Local Storage" filed
`
`09/02/2009, which is a continuation of and claims the benefit of priority of U.S.
`
`Application Serial No. 11/851,724 entitled "Storage Router and Method for
`
`Providing Virtual Local Storage" filed 09/07/2007, which is a continuation of and
`
`claims the benefit of priority of U.S. Patent Application Serial No. 11/442,878
`
`entitled "Storage Router and Method for Providing Virtual Local Storage" filed
`
`09/07/2007, which is a continuation of and claims the benefit of priority of U.S.
`
`Patent Application Serial No. 11/353,826 entitled "Storage Router and Method for
`
`Providing Virtual Local Storage" filed on 02/14/2006, now U.S. Patent No.
`
`7,340,549 issued 03/04/2008, which is a continuation of and claims the benefit of
`
`priority of U.S. Patent Application Serial No. 10/658,163 entitled "Storage Router
`
`and Method for Providing Virtual Local Storage" filed on 09/09/2003 now U.S.
`
`Patent No. 7,051,147 issued 05/23/2006, which is a continuation of and claims
`
`the benefit of benefit of priority of U.S. Patent Application Serial No. 10/081,11 0
`
`by inventors Geoffrey B. Hoese and Jeffery T. Russell, entitled "Storage Router
`
`and Method for Providing Virtual Local Storage" filed on 02/22/2002, now U.S.
`
`Patent No. 6, 789,152 issued on 09/07/2004, which in turn is a continuation of
`
`and claims benefit of priority of U.S. Application No. 09/354,682 by inventors
`
`Geoffrey B. Hoese and Jeffrey T. Russell, entitled "Storage Router and Method
`
`for Providing Virtual Local Storage" filed on 07/15/1999, now U.S. Patent No.
`
`6,421,753 issued on 07/16/2002, which in turn is a continuation of and claims
`
`benefit of priority of U.S. Patent Application Serial No. 09/001,799, filed on
`
`12/31/1997, now U.S. Patent No. 5,941,972 issued on 08/24/1999, and hereby
`
`incorporates these applications and patents by reference in their entireties as if
`
`they had been fully set forth herein.
`
`Oracle Ex. 1002, pg. 2
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`2
`
`[0002]
`
`This invention relates in general to network storage 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
`
`[0003]
`
`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
`
`operation 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 operation of which is described,
`
`for example, in Fibre Channel Physical and Signaling Interface (FC-PH), ANSI
`
`X3.230 Fibre Channel Arbitrated Loop (FC-AL), and ANSI X3.272 Fibre Channel
`
`Private Loop Direct Attach (FC-PLDA).
`
`[0004]
`
`Conventional computing devices, such as computer workstations, 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 protocols 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,
`
`Oracle Ex. 1002, pg. 3
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`3
`
`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.
`
`SUMMARY OF THE INVENTION
`
`[0005]
`
`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.
`
`[0006]
`
`According to one aspect of the present invention, a 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 connected 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.
`
`[0007]
`
`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 transport medium and a SCSI bus transport medium are interfaced 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 storage devices using native low level, block protocol in
`
`accordance with the configuration.
`
`Oracle Ex. 1002, pg. 4
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`4
`
`[0008]
`
`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 accesses its virtual local storage as if it were locally connected.
`
`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.
`
`[0009]
`
`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.
`
`[001 0]
`
`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.
`
`Oracle Ex. 1002, pg. 5
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`5
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[00 11]
`
`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:
`
`[0012]
`
`FIGURE 1 is a block diagram of a conventional network that provides storage
`
`through a network server;
`
`[0013]
`
`FIGURE 2 is a block diagram of one embodiment of a storage network with a
`
`storage router that provides global access and routing;
`
`[0014]
`
`FIGURE 3 is a block diagram of one embodiment of a storage network with a
`
`storage router that provides virtual local storage;
`
`[0015]
`
`FIGURE 4 is a block diagram of one embodiment of the storage router of
`
`FIGURE 3; and
`
`[0016]
`
`FIGURE 5 is a block diagram of one embodiment of data flow within the storage
`
`router of FIGURE 4.
`
`Oracle Ex. 1002, pg. 6
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`6
`
`DETAILED DESCRIPTION OF THE INVENTION
`
`[0017]
`
`FIGURE 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 workstation 12 can generally comprise
`
`a processor, memory, inpuUoutput 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 FIGURE
`
`1, network transport medium 16 is a network connection and storage devices 20
`
`comprise hard disk drives, although there are numerous alternate transport
`
`mediums and storage devices.
`
`[0018]
`
`In network 1 0, 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 workstations 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.
`
`[0019]
`
`FIGURE 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 FIGURE 1 in that there is
`
`no network server involved. In FIGURE 2, a Fibre Channel high speed serial
`
`transport 32 interconnects a plurality of workstations 36 and storage devices 38.
`
`A SCSI bus storage transport medium interconnects workstations 40 and storage
`
`Oracle Ex. 1002, pg. 7
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`7
`
`devices 42. A storage router 44 then serves to interconnect these mediums and
`
`provide devices on either medium global, 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 embodiment of FIGURE 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.
`
`[0020]
`
`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 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 and SCSI bus
`
`34 without any security access controls. Although this extension of the high
`
`speed serial interconnect provided by Fibre Channel is beneficial, it is desirable
`
`to provide security controls in addition to extended access to storage devices
`
`through a native low level, block protocol.
`
`[0021]
`
`FIGURE 3 is a block diagram of one embodiment of a storage network, indicated
`
`generally at 50, with a storage router that provides virtual local storage. Similar to
`
`that of FIGURE 2, storage network 50 includes a Fibre Channel high speed serial
`
`interconnect 52 and a SCSI bus 54 bridged by a storage router 56. Storage
`
`router 56 of FIGURE 3 provides for a large number of workstations 58 to be
`
`interconnected on a common storage transport and to access common storage
`
`devices 60, 62 and 64 through native low level, block protocols.
`
`[0022]
`
`According to the present invention, storage router 56 has enhanced functionality
`
`to implement security controls and routing such that each workstation 58 can
`
`Oracle Ex. 1002, pg. 8
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`8
`
`have access to a specific subset of the overall data stored in storage devices 60,
`
`62 and 64. This specific subset of data has the appearance and characteristics of
`
`local storage and is referred to herein as virtual local storage. Storage router 56
`
`allows the configuration and modification of the storage allocated to each
`
`attached workstation 58 through the use of mapping tables or other mapping
`
`techniques.
`
`[0023]
`
`As shown in FIGURE 3, for example, storage device 60 can be configured to
`
`provide global data 65 which can be accessed by all workstations 58. Storage
`
`device 62 can be configured to provide partitioned subsets 66, 68, 70 and 72,
`
`where each partition is allocated to one of the workstations 58 (workstations A, B,
`
`C and D). These subsets 66, 68, 70 and 72 can only be accessed by the
`
`associated workstation 58 and appear to the associated workstation 58 as local
`
`storage accessed using native low level, block protocols. Similarly, storage
`
`device 64 can be allocated as storage for the remaining workstation 58
`
`(workstation E).
`
`[0024]
`
`Storage router 56 combines access control with routing such that each
`
`workstation 58 has controlled access to only the specified partition of storage
`
`device 62 which forms virtual local storage for the workstation 58. This access
`
`control allows security control for the specified data partitions. Storage router 56
`
`allows this allocation of storage devices 60, 62 and 64 to be managed by a
`
`management station 76. Management station 76 can connect directly to storage
`
`router 56 via a direct connection or, alternately, can interface with storage router
`
`56 through either Fibre Channel 52 or SCSI bus 54. In the latter case,
`
`management station 76 can be a workstation or other computing device with
`
`special rights such that storage router 56 allows access to mapping tables and
`
`shows storage devices 60, 62 and 64 as they exist physically rather than as they
`
`have been allocated.
`
`[0025]
`
`The environment of FIGURE 3 extends the concept of single workstation having
`
`locally connected storage devices to a storage network 50 in which workstations
`
`Oracle Ex. 1002, pg. 9
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`9
`
`58 are provided virtual local storage in a manner transparent to workstations 58.
`
`Storage router 56 provides centralized control of what each workstation 58 sees
`
`as its local drive, as well as what data it sees as global data accessible by other
`
`workstations 58. Consequently, the storage space considered by the workstation
`
`58 to be its local storage is actually a partition (i.e., logical storage definition) of a
`
`physically remote storage device 60, 62 or 64 connected through storage router
`
`56. This means that similar requests from workstations 58 for access to their
`
`local storage devices produce different accesses to the storage space on storage
`
`devices 60, 62 and 64. Further, no access from a workstation 58 is allowed to the
`
`virtual local storage of another workstation 58.
`
`[0026]
`
`The collective storage provided by storage devices 60, 62 and 64 can have
`
`blocks allocated by programming means within storage router 56. To accomplish
`
`this function, storage router 56 can include routing tables and security controls
`
`that define storage allocation for each workstation 58. The advantages provided
`
`by implementing virtual local storage in centralized storage devices include the
`
`ability to do collective backups and other collective administrative functions more
`
`easily. This is accomplished without limiting the performance of workstations 58
`
`because storage access involves native low level, block protocols and does not
`
`involve the overhead of high level protocols and file systems required by network
`
`servers.
`
`[0027]
`
`FIGURE 4 is a block diagram of one embodiment of storage router 56 of FIGURE
`
`3. Storage router 56 can comprise a Fibre Channel controller 80 that interfaces
`
`with Fibre Channel 52 and a SCSI controller 82 that interfaces with SCSI bus 54.
`
`A buffer 84 provides memory work space and is connected to both Fibre Channel
`
`controller 80 and to SCSI controller 82. A supervisor unit 86 is connected to Fibre
`
`Channel controller 80, SCSI controller 82 and buffer 84. Supervisor unit 86
`
`comprises a microprocessor for controlling operation of storage router 56 and to
`
`handle mapping and-security access for requests between Fibre Channel 52 and
`
`SCSI bus 54.
`
`Oracle Ex. 1002, pg. 10
`
`

`
`ATTORNEY DOCKET NO.
`CROSS 1120-33
`
`PATENT APPLICATION
`CUSTOMER NO. 44654
`
`10
`
`[0028]
`
`FIGURE 5 is a block diagram of one embodiment of data flow within storage
`
`router 56 of FIGURE 4. As shown, data from Fibre Channel 52 is processed by a
`
`Fibre Channel (FC) protocol unit 88 and placed in a FIFO queue 90. A direct
`
`memory access (DMA) interface 92 then takes data out of FIFO queue 90 and
`
`places it in buffer 84. Supervisor unit 86 processes the data in buffer 84 as
`
`represented by supervisor processing 93. This processing involves mapping
`
`between Fibre Channel 52 and SCSI bus 54 and applying access controls and
`
`routing functions. A DMA interface 94 then pulls data from buffer 84 and places it
`
`into a buffer 96. A SCSI protocol unit 98 pulls data from buffer 96 and
`
`communicates the data on SCSI bus 54. Data flow in the reverse direction, from
`
`SCSI bus 54 to Fibre Channel 52, is accomplished in a reverse manner.
`
`[0029]
`
`The storage router of the present invention is a bridge device that connects a
`
`Fibre Channel link directly to a SCSI bus and enables the exchange of SCSI
`
`command set information between application clients on SCSI bus devices and
`
`the Fibre Channel links. Further, the storage router applies access controls such
`
`that virtual local storage can be established in remote SCSI storage devices for
`
`workstations on the Fibre Channel link. In one embodiment, the storage router
`
`provides a connection for Fibre Channel links running the SCSI Fibre Channel
`
`Protocol (FCP) to legacy SCSI devices attached to a SCSI bus. The Fibre
`
`Channel topology is typically an Arbitrated Loop (FC_AL).
`
`[0030]
`
`In part, the storage router enables a migration path Fibre Channel based, serial
`
`SCSI networks by providing connectivity for legacy SCSI bus devices. The
`
`storage router can be attached to a Fibre Channel Arbitrated Loop and a SCSI
`
`bus to support a number of SCSI devices. Using configuration settings, the
`
`storage router can make the SCSI bus devices available on the Fibre Channel
`
`network as FCP logical units. Once the configuration is defined, operation of the
`
`storage router is transparent to application clients. In this manner, the storage
`
`router can form an integral part of the migration to new Fibre Channel based
`
`networks while providing a means to continue using legacy SCSI devices.
`
`Oracle Ex. 1002, pg. 11
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`ATTORNEY DOCKET NO.
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`CUSTOMER NO. 44654
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`11
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`[0031]
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`In one implementation (not shown), the storage router can be a rack mount or
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`free standing device with an internal power supply. The storage router can have
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`a Fibre Channel and SCSI port, and a standard, detachable power cord can be
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`used, the FC connector can be a copper DB9 connector, and the SCSI connector
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`can be a 68-pin type. Additional modular jacks can be provided for a serial port
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`and an 802.3 1 OBaseT port, i.e. twisted pair Ethernet, for management access.
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`The SCSI port of the storage router an support SCSI direct and sequential
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`access target devices and can support SCSI initiators, as well. The Fibre
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`Channel port can interface to SCSI-3 FCP enabled devices and initiators.
`
`[0032]
`
`To accomplish its functionality, one implementation of the storage router uses: a
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`Fibre Channel interface based on the HEWLETT-PACKARD TACHYON HPFC-
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`5000 controller and a GLM media interface; an Intel 80960RP processor,
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`incorporating independent data and program memory spaces, and associated
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`logic required to implement a stand alone processing system; and a serial port
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`for debug and system configuration. Further, this implementation includes a SCSI
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`interface supporting Fast-20 based on the SYMBIOS 53C8xx series SCSI
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`controllers, and an operating system based upon the WIND RIVERS SYSTEMS
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`VXWORKS or IXWORKS kernel, as determined by design. In addition, the
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`storage router includes software as required to control basic functions of the
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`various elements, and to provide appropriate translations between the FC and
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`SCSI protocols.
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`[0033]
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`The storage router has various modes of operation that are possible between FC
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`and SCSI target and initiator combinations. These modes are: FC Initiator to
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`SCSI Target; SCSI Initiator to FC Target; SCSI Initiator to SCSI Target; and FC
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`Initiator to FC Target. The first two modes can be supported concurrently in a
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`single storage router device and are discussed briefly below. The third mode can
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`involve two storage router devices back to back and can serve primarily as a
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`device to extend the physical distance beyond that possible via a direct SCSI
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`connection. The last mode can be used to carry FC protocols encapsulated on
`
`Oracle Ex. 1002, pg. 12
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`

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`ATTORNEY DOCKET NO.
`CROSS 1120-33
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`PATENT APPLICATION
`CUSTOMER NO. 44654
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`12
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`other transmission technologies (e.g. ATM, SONET), or to act as a bridge
`
`between two FC loops (e.g. as a two port fabric).
`
`[0034]
`
`The FC Initiator to SCSI Target mode provides for the basic configuration of a
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`server using Fibre Channel to communicate with SCSI targets. This mode
`
`requires that a host system have an FC attached device and associated device
`
`drivers and software to generate SCSI-3 FCP requests. This system acts as an
`
`initiator using the storage router to communicate with SCSI target devices. The
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`SCSI devices supported can include SCSI-2 compliant direct or sequential
`
`access (disk or tape) devices. The storage router serves to translate command
`
`and status information and transfer data between SCSI-3 FCP and SCSI-2,
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`allowing the use of standard SCSI-2 devices in a Fibre Channel environment.
`
`[0035]
`
`The SCSI Initiator to FC Target mode provides for the configuration of a server
`
`using SCSI-2 to communicate with Fibre Channel targets. This mode requires
`
`that a host system has a SCSI-2 interface and driver software to control SCSI-2
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`target devices. The storage router will connect to the SCSI-2 bus and respond as
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`a target to multiple target IDs. Configuration information is required to identify the
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`target IDs to which the bridge will respond on the SCSI-2 bus. The storage router
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`then translates the SCSI-2 requests to SCSI-3 FCP requests, allowing the use of
`
`FC devices with a SCSI host system. This will also allow features such as a tape
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`device acting as an initiator on the SCSI bus to provide full support for this type
`
`of SCSI device.
`
`[0036]
`
`In general, user configuration of the storage router will be needed to support
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`various functional modes of operation. Configuration can be modified, for
`
`example, through a serial port or through an Ethernet port via SNMP (simple
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`network management protocol) or the Telnet session. Specifically, SNMP
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`manageability can be provided via a 802.3 Ethernet interface. This can provide
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`for configuration changes as well as providing statistics and error information.
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`Configuration can also be performed via TELNET or RS-232 interfaces with
`
`menu driven command interfaces. Configuration information can be stored in a
`
`Oracle Ex. 1002, pg. 13
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`

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`ATTORNEY DOCKET NO.
`CROSS 1120-33
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`PATENT APPLICATION
`CUSTOMER NO. 44654
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`13
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`segment of flash memory and can be retained across resets and power off
`
`cycles. Password protection can also be provided.
`
`[0037]
`
`In the first two modes of operation, addressing information is needed to map from
`
`FC addressing to SCSI addressing and vice versa. This can be 'hard'
`
`configuration data, due to the need for address information to be maintained
`
`across initialization and partial reconfigurations of the Fibre Channel address
`
`space. In an arbitrated loop configuration, user configured addresses will be
`
`needed for AL_PAs in order to insure that known addresses are provided
`
`between loop reconfigurations.
`
`[0038]
`
`With respect to addressing, FCP and SCSI 2 systems employ different methods
`
`of addressing target devices. Additionally, the inclusion of a storage router
`
`means that a method of translating device IDs needs to be implemented. In
`
`addition, the storage router can respond to commands without passing the
`
`commands through to the opposite interface. This can be implemented to allow
`
`all generic FCP and SCSI commands to pass through the storage router to
`
`address attached devices, but allow for configuration and diagnostics to be
`
`performed directly on the storage router through the FC and SCSI interfaces.
`
`[0039]
`
`Management commands are those intended to be processed by the storage
`
`router controller directly. This may include diagnostic, mode, and log commands
`
`as well as other vendor-specific commands. These commands can be received
`
`and processed by both the FOP and SCSI interfaces, but are not typically
`
`bridged to the opposite interface. These commands may also have side effects
`
`on the operation of the storage router, and cause other storage router operations
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`to change or terminate.
`
`[0040]
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`A primary method of addressing management commands though the FCP and
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`SCSI interfaces can be through peripheral device type addressing. For example,
`
`the storage router can respond to all operations addressed to logical unit (LUN)
`
`zero as a controller device. Commands that the storage router will support can
`
`Oracle Ex. 1002, pg. 14
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`ATTORNEY DOCKET NO.
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`14
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`include INQUIRY as well as vendor-specific management commands. These are
`
`to be generally consistent with SCC standard commands.
`
`[0041]
`
`The SCSI bus is capable of establishing bus connections between targets. These
`
`targets may internally address logical units. Thus, the prioritized addressing
`
`scheme used by SCSI subsystems can be represented as follows:
`
`BUS:TARGET:LOGICAL UNIT. The BUS identification is intrinsi