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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 179997180008)) (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 Chaparral Exhibits D079).
HPFC-5000 Tachyon User's Manuel, First Edition (PTI 172419-839) (CD-ROM Chaparral Exhibits D084), May 1, 1996.
X3T10 994D—(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-
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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
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 Preliminary Datasheet; Crossroads Company and Product Overview (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-
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CR4x00 Product Specification (CRDS 43929) (CD-ROM
Chaparral Exhibits P267), Jun. 1, 1998.
Symbios Logic—Hardware Function Specification for the
Symbios Logic Series 3 Fibre Channel Disk Array Control-
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* cited by examiner
U.S. Patent May 23,2006 Sheet 1 of 2 US 7,051,147 B2
STORAGE ROUTER AND METHOD FOR
PROVIDING VIRTUAL LOCAL STORAGE
This application is a continuation of and claims the benefit of the filing dates of U.S. 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 U.S. Pat. 10 No. 6,789,152 which in turn is a continuation of U.S. 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 U.S. Pat. No. 6,421,753, which in turn is a 15 continuation of U.S. patent application Ser. No. 09/001,799, filed on Dec. 31, 1997, now U.S. 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
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 25 storage devices to Fibre Channel devices.
BACKGROUND OF THE INVENTION
Typical storage transport mediums provide for a relatively 30 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. 35 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 40 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).
Conventional computing devices, such as computer workstations, generally access storage locally or through network 45 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 50 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 55 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 60 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, 65 the access is much slower than access to data on a local storage device.
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.
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.
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.
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 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.
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;
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 5
FIG. 5 is a block diagram of one embodiment of data flow within the storage router of FIG. 4.
DETAILED DESCRIPTION OF THE
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 15 server 14 via a network transport medium 16. Each workstation 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 20 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 25 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, 30 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, 35 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 40 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 45 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 workstations 36 and storage devices 38. A SCSI bus storage transport medium interconnects workstations 40 and storage 50 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 55 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- 60 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 65 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 32 is beneficial, it is desirable to provide security controls in addition to extended access to storage devices through a native low level, block protocol.
FIG. 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 FIG. 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 FIG. 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.
According to the present invention, storage router 56 has enhanced functionality to implement security controls and routing such that each workstation 58 can 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.
As shown in FIG. 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).
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.
The environment of FIG. 3 extends the concept of a single workstation having locally connected storage devices to a storage network 50 in which workstations 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