--w.
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`n
`\0
`
`........,.
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`~====c '""---------------------------------,~--------------~--------------------------------------~
`Attorney Docket No. I 51876p219
`tn
`UTILITY
`First Inventor or Application Identifier I Sung-Hoon Baek
`PATENT APPLICATION
`~
`ci
`Title I APPARATUSFORREDUNDANTINTERCONNECTIONBETWEENMUI..: -a:
`TRANSMITTAL
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`em014066885us
`
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`395.00
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`Sung-Hoon Baek, et al.
`
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`600 244
`130 122
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`IPR2014-00949 Owner Ex. 2001
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`IBM & Oracle, Petitioners
`
`

`

`Our Ref. No.: 51876.P219
`Express Mail No. EM014066885US
`
`UTILITY APPLICATION FOR UNITED STATES PATENT
`
`FOR
`
`APPARATUS FOR REDUNDANT INTERCONNECTION BETWEEN MULTIPLE
`HOSTS AND RAID
`
`Inventor(s):
`
`Sung-Hoon Baek et al.
`
`3
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`APPARATUS FOR REDUNDANT INTERCONNECTION
`
`BETWEEN MULTIPLE HOSTS AND RAID
`
`Field of the Invention
`
`5
`
`The present invention relates to an apparatus for a redundant
`
`interconnection between multiple host computers and a redundant
`
`arrays of inexpensive disks (hereinafter, referred to as 'RAID' ) ;
`
`and, more particularly,
`
`to an apparatus
`
`for
`
`a
`
`redundant
`
`10
`
`interconnection between multiple host computers and multiple
`
`controllers of the RAID, which is capable of supporting a fault
`
`tolerance of the RAID controllers and simultaneously heightening
`
`performance.
`
`15
`
`Prior Art of the Invention
`
`A RAID is a storage system based on a large capacity and a
`
`high performance, by using much quantity of disks, and is a fault
`
`tolerant system in which the disks or controllers etc. have a
`
`20
`
`redundant nature. In general, the RAID has two controllers, which
`
`are used like a method shown in Fig. 1 or 2.
`
`Fig. 1 is an exemplary block diagram showing a general
`
`connection method between the host computers and the RAID having
`
`the conventional two controllers.
`
`25
`
`As shown in the drawing, such system independently uses two
`
`RAID controllers 140, 141, and has an independent connection with
`
`network interface controllers 110, 111 of the host computers. That
`
`1
`
`4
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`is, such system has twice the bandwidth and twice the performance.
`
`However, there is such a problem that a loss of data occurs when
`
`one out of two RAID controllers 140,141 has a trouble, in other
`
`words, this system does not become the fault tolerant system.
`
`5
`
`Fig. 2 is an exemplary block diagram of a general host
`
`interface system having a communication interface for an error
`
`recovery between the conventional two controllers.
`
`In order to provide fault tolerance not provided in Fig. 1,
`
`two RAID controllers 230, 231 and host computers 200, 201 are
`
`10
`
`connected with each other through a hub or switch 210 in one network.
`
`Thus, even though one RAID controller 230 or 231 has a trouble,
`
`all of the host computers 200, 201 are connected to a RAID controller
`
`that does not have a trouble. That is, this RAID controller not
`
`having the trouble serves as a role of the controller that has the
`
`15
`
`trouble. Also, since the RAID controllers 230, 231 should exchange
`
`information with each other by preparing in advance against some
`
`trouble, the RAID controllers 230, 231 are connected with each other
`
`through communication controllers 221, 222. However, in this case
`
`only a half of performance for the bandwidth provided in Fig. 1
`
`20
`
`can be obtained.
`
`Fig. 3 is an exemplary block diagram showing a wiring method
`
`between a conventional RAID and the host computers.
`
`The construction shown in the drawing partially represents
`
`a systematic connection between a RAID and host computers, which
`
`25
`
`is extracted from contents disclosed in the U.S. Patent No.
`
`5,812,754. However, this construction has no any difference from
`
`that of Fig. 2, in the structure of a communication network, and
`
`2
`
`5
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`in case that one out of two host computers 300, 301 has rather a
`
`trouble, there is caused a problem that a network is broken. Thus,
`
`this construction is inferior to the construction of Fig. 2.
`
`5
`
`Summary of the Invention
`
`Therefore, it is an object of the present invention to provide
`
`an apparatus for a redundant interconnection between multiple host
`
`computers and a RAID, which is capable of supporting a fault
`
`10
`
`tolerance of a RAID controller and simultaneously heightening a
`
`performance.
`
`In accordance with the present invention, the apparatus for
`
`a redundant interconnection between multiple hosts and a RAID
`
`comprises a plurality of RAID controllers for processing requests
`
`15
`
`of numerous host computers connected with one another through an
`
`industrial standard communication network such as fibre channel
`
`and performing fault tolerant function; a plurality of connecting
`
`units for connecting the plurality of RAID controllers to the
`
`numerous host computers; and a plural number of network interface
`
`20
`
`controllers respectively contained into the plurality of RAID
`
`controllers,
`
`the network
`
`interface controllers being
`
`for
`
`exchanging information directly with each of opposite network
`
`interface controllers provided within the numerous host computers
`
`and within opposite RAID controllers, through the plurality of
`
`25
`
`connecting units.
`
`3
`
`6
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`Brief Description of the Drawings
`
`The above and other objects and features of the instant
`
`invention will become apparent from the following description of
`
`5
`
`preferred embodiments taken in conjunction with the accompanying
`
`drawings,
`
`in which:
`
`Fig.
`
`1 is an exemplary block diagram showing a general
`
`connection
`
`system between host computers and a RAID having
`
`conventional two controllers;
`
`10
`
`Fig. 2 indicates an exemplary block diagram of a general host
`
`interface system having a communication interface for an error
`
`recovery between the conventional two controllers;
`
`Fig. 3 illustrates an exemplary block diagram of a wiring
`
`method between a conventional RAID and host computers;
`
`15
`
`Fig. 4 is a block diagram showing one embodiment of a host
`
`interface system as an internal installment system between a RAID
`
`and host computers in accordance with the present invention;
`
`Fig. 5 depicts a block diagram providing one embodiment of
`
`a host interface system as an external installment system between
`
`20
`
`a RAID and host computers in the present invention; and
`
`Fig. 6 is a block diagram showing one embodiment of a host
`
`interface system as a network switch between a RAID and host
`
`computers in the invention.
`
`25
`
`Preferred Embodiment of the Invention
`
`Hereinafter, preferred embodiments of the present invention
`
`4
`
`7
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`will be described in detail with reference to the accompanying
`
`drawings.
`
`Fig. 4 is a block diagram showing one embodiment of a host
`
`matching system as an internal installment system between a RAID
`
`5
`
`and host computers in accordance with the present invention.
`
`As shown in Fig. 4, in the inventive host interface system,
`
`a communication circuit is provided in order for an error recovery
`
`between two RAID controllers 460, 461, and the bandwidth between
`
`two groups as the host computers 400 to 405 and two RAID controllers
`
`10
`
`460, 461 becomes twice the single connection bandwidth. Also, in
`
`the
`
`inventive host interface system, even
`
`though one RAID
`
`controller 4 60 or 4 61 has an occurrence of a trouble, the bandwidth
`
`becomes twice the single connection bandwidth.
`
`That is to say, in a RAID 490, two RAID controllers 460, 461
`
`15
`
`and hubs 440, 441 exist, and in each of the RAID controllers 460,
`
`461, a pair of network interface controllers 470, 471; 480, 481
`
`are provided. Herewith, the hubs 440, 441 are provided to connect
`
`a system connected to these hubs by one network and maintain the
`
`network even though one system has an occurrence of a trouble or
`
`20
`
`a short of a line, and it can be as a hub or a switch. Hereinafter,
`
`they are named a "hub" altogether.
`
`Hub ports, 420 to 424, 430 to 434, shown in Fig. 4 indicate
`
`an example for a simple internal structure of a fibre channel
`
`arbitrated loop hub, and this is based on an already well-known
`
`25
`
`technique, thus there will be herein no more description therefore
`
`in the invention. The hub observes its corresponding communication
`
`network standard.
`
`5
`
`8
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`A network, in which the RAID controllers, the hubs and the
`
`host computers are connected with one another, corresponds to the
`
`industrial standard communication network such as fibre channel,
`
`asynchronous transfer mode (ATM) and InfiniBand etc. and they are
`
`5
`
`hereinafter named a
`
`'network' .
`
`Network interface controllers, 410 to 415, contained into the
`
`host computers, 400 to 405, and the network interface controllers
`
`470, 471, 480, 481 of the RAID controllers 460, 461 are connected
`
`with one another by two networks through two hubs 440, 441, and
`
`10
`
`according to a sort of the networks,
`
`the network interface
`
`controller becomes a fibre channel controller, an ATM controller
`
`and an InfiniBand controller etc.
`
`At this time, a communication line, representatively shown
`
`as 450 in the drawing, for connecting the network interface
`
`15
`
`controller to the hub is a copper line or an optical fibre, which
`
`is matched to a corresponding standard.
`
`Meanwhile, two network interface controllers 4 7 0, 4 71 of the
`
`first RAID controller 4 60 are respectively connected to two
`
`different hub ports 423, 432, and two network interface controllers
`
`20
`
`480, 481 of the second RAID controller 461 are respectively
`
`connected to two different hub ports 422, 433. The rest ports 420,
`
`421, 424, 430, 431, 434 of the hubs 440, 441 are connected to the
`
`host computers 400 to 405. Just, there is no distinction between
`
`the hub ports 420 to 424 of the first hub 440 at all. Also, there
`
`25
`
`is no distinction between the hub ports 430 to 434 of the second
`
`hub 441 at all.
`
`The hub port connected to the host computer among the hub
`
`6
`
`9
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`ports of the hub 440, namely, 420, 421, 424, is more than one, and
`
`there is no limitation to the maximum number. Further, What it is
`
`connected to the host computer among the hub ports of the second
`
`hub 441, namely, 430, 431, 434, is more than one, and there is no
`
`5
`
`limitation to the maximum number. The hub ports 424, 434 and the
`
`host computers 400, 405, which are shown as dot lines in Fig. 4,
`
`mean that there is no, or more than one hub port or host computer.
`
`Since, in such construction, two independent networks are
`
`constructed; it has twice the bandwidth of the single network, and
`
`~;';,'
`
`10
`
`a communication passage between two RAID controllers needed to
`
`perform the fault tolerant function of two RAID controllers 460,
`
`461 is formed. Thus, information from the second network interface
`
`controller 4 71 of the first RAID controller 4 60 is sent to the first
`
`network interface controller 481 of the second RAID controller 461.
`
`15 Also, information from the second network interface controller 480
`
`of the second RAID controller 461 is transmitted to the first
`
`network interface controller 470 of the first RAID controller 460.
`
`Further, information from the first network interface controller
`
`4 81 of the second RAID controller 4 61 is transmitted to the second
`
`20
`
`network interface controller 471 of the first RAID controller 460,
`
`and information from the first network interface controller 470
`
`of the first RAID controller 460 is sent to the second network
`
`interface controller 480 of the second RAID controller 461.
`
`The first network interface controllers 4 7 0, 4 8 0 of two RAID
`
`25
`
`controllers 460, 461 respectively supply data of the host computers
`
`400 to 402 connected to the first hub 440 and the host computer
`
`403 to 405 connected to the second hub 441, and process information
`
`7
`
`10
`
`IPR2014-00949 Owner Ex. 2001
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`
`

`

`transmitted from the opposite network interface controllers 471,
`
`481.
`
`If any one out of two RAID controllers 460, 461 has an
`
`occurrence of an error, the RAID controller having the error
`
`5
`
`occurrence is removed from the network, and a second network
`
`interface controller of an opposite RAID controller not having the
`
`error occurrence takes over a function of a first network interface
`
`controller of the RAID controller having the error occurrence.
`
`Fig. 5 is a block diagram providing one embodiment of the host
`
`10
`
`interface system as an external installation system between the
`
`RAID and the host computers in the present invention.
`
`As shown in Fig. 4, the present invention can be constructed
`
`by a method of internally installing the hubs 440, 441 in the RAID
`
`490, and as shown in Fig. 5, it can be constructed by using the
`
`15
`
`hubs 510, 520 for use of an external-installation.
`
`Fig. 6 is a block diagram showing one embodiment of the host
`
`interface system as a network switch between the inventive RAID
`
`and host computers.
`
`As shown in the drawing, Fig. 6 can have a function of Fig.
`
`20
`
`4. In other words, information from a second network interface
`
`controller 622 of a first RAID controller 620 is sent to a first
`
`network interface controller 632 of a second RAID controller 630,
`
`and information from a second network interface controller 632 of
`
`the second RAID controller 630 is transmitted to a first network
`
`25
`
`interface controller 621 of the first RAID controller 620. Further,
`
`information from the first network interface controller 631 of the
`
`second RAID controller 630 is transmitted to the second network
`
`8
`
`11
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`interface controller 622 of the first RAID controller 620. Also,
`
`information from the first network interface controller 621 of the
`
`first RAID controller 620 is sent to the second network interface
`
`controller 632 of the second RAID controller 630.
`
`5
`
`Just, there is no distinction between respective ports,
`
`representatively 611, of a network switch 610 at all and also, the
`
`internal structure of a network switch 610 can be configured
`
`according to a selection of a user (not shown in Fig. 6).
`
`In accordance with the present invention, as afore-mentioned,
`
`10
`
`even in a case of an error occurrence in a RAID controller, there
`
`exist
`
`two
`
`independent networks and
`
`two network
`
`interface
`
`controllers, and the bandwidth of a single network can be twice
`
`maintained. Accordingly, a function of fault tolerance between two
`
`RAID controllers can be constructed without a drop of the bandwidth.
`
`15
`
`It will be apparent to those skilled in the art that various
`
`modifications and variations can be made in the present invention
`
`without deviating from the spirit or scope of the invention. Thus,
`
`it is intended that the present invention cover the modifications
`
`and variations of this invention provided they come within the scope
`
`20
`
`of the appended claims and their equivalents.
`
`9
`
`12
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`What is claimed is:
`
`1. An apparatus for a
`
`redundant interconnection between
`
`multiple hosts and a RAID, comprising:
`
`5
`
`a plurality of RAID controlling units for processing a
`
`requirement of numerous host computers;
`
`a plurality of connecting units for connecting the plurality
`
`of RAID controlling units to the numerous host computers; and
`
`a plural number of network interface controlling units
`
`10
`
`respectively contained into the plurality of RAID controlling
`
`units, for exchanging information directly with the numerous host
`
`. computers and an opposite network interface controlling unit
`
`provided within an opposite RAID controlling units, through the
`
`plurality of connecting units.
`
`15
`
`2. The apparatus as recited in claim 1, wherein said respective
`
`RAID controlling units are connected to the plurality of individual
`
`connecting units.
`
`20
`
`3. The apparatus as recited in claim 2, wherein said each
`
`network interface controlling unit is constructed by a pair, namely
`
`two, and is contained into the plurality of RAID controlling units,
`
`a first network interface controlling unit of said network
`
`interface controlling unit being connected to the connecting unit
`
`25
`
`of one side and a second network interface controlling unit thereof
`
`being connected to the connecting unit of another side.
`
`10
`
`13
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`4. The apparatus as recited in claim 3, wherein said each
`
`network interface controlling unit further comprises:
`
`the first network interface controlling unit for processing
`
`the requirement of the numerous host computers; and
`
`5
`
`the second network interface controlling unit used for fault
`
`tolerance
`
`in a
`
`communication between
`
`the
`
`respective RAID
`
`controlling units when the respective RAID controlling units do
`
`not have the occurrence of the error, said second network interface
`
`controlling unit being for executing a function of the first network
`
`10
`
`interface controlling unit of the RAID controlling unit having the
`
`occurrence of the error in case that one given RAID controlling
`
`unit has the occurrence of the error.
`
`5. The apparatus as recited in claim 1, wherein said plurality
`
`15
`
`of connecting units have connection ports more than three, the two
`
`connection ports among
`
`them being connected to said network
`
`interface controlling unit and the rest connection ports thereof
`
`being provided as a hub equipment connected with the numerous host
`
`computers.
`
`20
`
`6. The apparatus as recited in claim 1, wherein said plurality
`
`of connecting units have the connection ports more than three, the
`
`two connection ports among them being connected to said network
`
`interface controlling unit and the rest connection ports thereof
`
`25
`
`being provided as a network switch equipment connected with the
`
`numerous host computers.
`
`11
`
`14
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`7. The apparatus as recited in claim 1, wherein said plurality
`
`of connecting units have the connection ports more than five, the
`
`four connection ports among them being connected to said network
`
`interface controlling unit and the rest connection ports thereof
`
`5
`
`being provided as a switch connected with the numerous host
`
`computers.
`
`8. The apparatus as recited in claim 1, wherein said RAID
`
`controlling unit, said network interface controlling unit and said
`
`10
`
`connecting unit are respectively constructed by a pair, the first
`
`network interface controlling unit of a first RAID controlling unit
`
`being connected to a first connecting unit, the second network
`
`interface controlling unit of said first RAID controlling unit
`
`being connected to a second connecting unit, the first network
`
`15
`
`interface controlling unit of a second RAID controlling unit being
`
`connected to the second connecting unit, and the second network
`
`interface controlling unit of the second RAID controlling unit
`
`being connected to the first connecting unit.
`
`12
`
`15
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`Abstract of the Disclosure
`
`The apparatus for a
`
`redundant
`
`interconnection between
`
`multiple hosts and a
`
`redundant array of
`
`inexpensive disks
`
`5
`
`(hereinafter, referred to as
`
`'RAID'), which is capable of
`
`supporting
`
`a
`
`fault
`
`tolerance of RAID
`
`controllers
`
`and
`
`simultaneously heightening a performance, comprises a plurality
`
`of RAID controlling units for processing a requirement of numerous
`
`host computers connected with one another through the industrial
`
`10
`
`standard communication network and for fault
`
`tolerance;
`
`a
`
`plurality of connecting units for connecting the plurality of RAID
`
`controlling units to the numerous host computers; and a plural
`
`number of network
`
`interface controlling units respectively
`
`contained into the plurality of RAID controlling units, for
`
`15
`
`exchanging information directly with an opposite network interface
`
`controlling unit provided within an opposite RAID controlling unit
`
`and the numerous host computers,
`
`through
`
`the plurality of
`
`connecting units.
`
`13
`
`16
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`Attorney Docket No.: 51876p219
`
`IN THE UNITED STATES PATENT AND TRADEMARK OFFICE
`
`Art Group:
`
`Examiner:
`
`In re the Application of:
`
`SUNG-HOON BAEK, ET AL.
`
`Application No.:
`
`Filed:
`
`For:
`
`APPARATUS FOR REDUNDANT
`INTERCONNECTION BETWEEN
`MULTIPLE HOSTS AND RAID -
`UTILITY
`
`Assistant Commissioner for Patents
`Washington, D.C. 20231
`
`TRANSMITTAL OF FORMAL DRAWINGS
`
`Sir:
`
`Enclosed herewith for filing in the above-identified U.S. Patent Application are the formal drawings,
`
`6 sheets including 6 Figures. Applicant hereby authorizes any additional extension or petition fees under 37
`
`C.P.R. § 1.17 or credit for any overpayment to our Deposit Account No. 02-2666. A copy of the Fee
`
`Transmittal sheet is enclosed.
`
`Respectfully submitted,
`
`BLAKELY, SOKOLOFF, TAYLOR & ZAFMAN
`
`Thomas M. Coester, Reg. No. 39,637
`
`Dated:
`
`12400 Wilshire Blvd., 7th Floor
`Los Angeles, California 90025
`Telephone: (310) 207-3800
`
`17
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`FIG. 1
`
`J
`
`100
`r-----------L ---,
`HOST COMPUTER
`:
`110
`I
`I
`I
`I
`/
`I
`I
`NETWORK INTERFACE
`I
`I
`CONTROLLER
`I
`I
`I
`I
`I TX I AX I
`I
`I
`I
`I
`L ______ -- ~-----_j
`
`r __________ _L !.9!_-,
`
`HOST COMPUTER
`111
`
`:
`I
`I
`I
`I
`I
`I
`I
`I
`L _____
`
`J
`
`I
`I
`/
`I
`NETWORK INTERFACE
`I
`CONTROLLER
`I
`I
`I TX I AX I
`I
`I
`-- ,_ _____ _j
`
`t>12o
`
`r -
`
`(>121
`
`r -
`
`140
`150
`)
`J
`r-(--, -- r----L-,
`I AX I TX I
`I
`I
`I
`I
`I
`I
`I NETWORK INTERFACE
`I
`I
`I
`CONTROLLER
`I
`I
`I
`I
`RAID CONTROLLER
`I
`I
`L ____________ _j
`
`/130
`
`RAID
`
`1j1
`151
`I
`r--1-- -- ___ L-,
`I AX I TX J
`I
`I
`I
`I
`I
`I
`I NETWORK INTERFACE
`I
`I
`I
`CONTROLLER
`I
`I
`I
`I
`RAID CONTROLLER
`I
`I
`L ____________ _j
`
`18
`
`IPR2014-00949 Owner Ex. 2001
`ETRI, Patent Owner
`IBM & Oracle, Petitioners
`
`

`

`FIG. 2
`
`HOST COMPUTER
`
`__________ _L200
`1
`1
`:
`:
`I
`I
`I
`I
`NETWORK INTERFACE
`I
`I
`CONTROLLER
`I
`I
`I
`I
`I TX I RX I
`I
`I
`I
`I
`L ______ -- F------_j
`
`201
`.----------....L ---,
`:
`HOST COMPUTER
`:
`I
`I
`I
`I
`NETWORK INTERFACE
`I
`I
`CONTROLLER
`I
`I
`I
`I
`I TX RX I
`I
`I
`I
`I
`L ______ -- F------_j
`
`210
`.---------------------~---------------,
`HUB OR SWITCH
`1
`1
`I
`I
`I
`I
`I SOUl
`jsou:
`1sou:
`I
`I
`~ I rD- I
`I
`~
`~
`I
`l r l)
`r l)
`r--1
`r
`!
`I
`I
`I
`I
`l TX l RX
`TX I RX
`I TX I RX
`I TX I RX
`I
`I
`I
`I
`L---1--- - - - - -- ------- -- - - - - --t-----_j
`
`SOU'
`
`r
`
`,------ -- ---- ,_ __ 1-------- --- - - - -- ____ _L2j~
`,,
`"" "
`I
`I
`£
`/
`I RX I TX
`RX I TX I
`I RX l TX J
`I RX I TX I
`I
`I
`I
`I
`I
`I
`COMMUNI-
`NETWORK
`COMMUNI-
`NETWORK
`I
`I
`I
`I
`CATION
`CATION
`INTERFACE
`INTERFACE
`I
`I
`CONTROLLER
`CONTROLLER
`CONTROLLER
`CONTROLLER
`I
`I
`I
`I
`'-220
`'-221
`'-222
`'-223
`I
`I
`I
`I
`RAID CONTROLLER
`RAID CONTROLLER
`I
`I
`\...
`\...
`I
`I
`231 RAID I
`230
`I
`L---------------------------------