JP2017016723A - Library device, recording medium storage cell determination method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a difference in a time required for picking up a recording medium from a deep cell between when the recording medium is stored in the cell on an insertion port side of the deep cell and when stored in the cell on a depth side thereof to be reflected on an arrangement of the recording medium.SOLUTION: A library device comprises: a magazine that stores a recording medium to be inserted, and that has one or more deep cells in which a cell storing the recording medium is plurally arranged in series in an insertion direction of the recording medium provided; an access frequency determination unit that determines whether access frequency to the recording medium is higher than a prescribed determination reference on an insertion port side on the basis of an access history to the recording medium to be stored in the cell; and a storage cell decision unit that, when the access frequency determination unit determines that the access frequency to the recording medium is higher than the determination reference on the insertion port side, decides on a prescribed cell served to be a cell at a position closer to the insertion port of a plurality of cells arranged in the deep cell for the cell storing the recording medium.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a library device, a recording medium storage cell determination method, and a program.

  One storage device that can exchange recording media is a library device. The library apparatus includes a magazine that stores a recording medium and is detachable from the main body of the library apparatus, and reads / writes data from / to the recording medium stored in the magazine while the magazine is inserted into the main body.

Here, Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique related to efficient access to a recording medium stored in a library apparatus. In the library device described in Patent Document 1, the storage unit of the warehouse (magazine) is divided into groups according to the transport distance with respect to the drive device in advance, and a group number i that increases as the transport distance increases is assigned to each group. . Further, a weight m for weighting the last access time and the access record is assigned to each file or recording medium. Then, when the recording medium loaded in the drive device is returned from the group i in the warehouse to the warehouse, the recording medium with the oldest last access time is selected from the recording media stored in the group k = (im). k + 1). This operation is repeated while increasing the value of k one by one until k = (i−1), and the recording medium on which data reading / writing has been completed is stored in group k.
According to Patent Document 1, it is possible to handle files and recording media having different access characteristics in an integrated manner with high access performance.

JP-A-9-128162

One library apparatus is a library apparatus having a deep cell. In the deep cell, the cells that store the recording medium are arranged in series in the insertion direction of the recording medium into the deep cell, respectively on the insertion port side and the back side.
When a recording medium stored in a cell on the back side of the deep cell is loaded in the drive device, if the recording medium is stored on the insertion port side of the deep cell, the recording medium is temporarily retracted and then It is necessary to take out the recording medium from the cell on the side. For this reason, when taking out the recording medium stored in the cell on the back side, it takes much longer than taking out the recording medium stored in the cell on the insertion port side.

  In the method of grouping the storage units according to the transport distance of the storage unit with respect to the drive device as described in Patent Document 1, the recording medium is stored in the cell on the insertion side of the deep cell and the back side. The difference in the time required to take out the recording medium from the cell in the case where it is accommodated in the cell on the side cannot be reflected in the grouping of the accommodating units. In this regard, even if the method of grouping the storage units according to the transport distance of the storage unit to the drive device is used for a library device having a deep cell, the recording medium is stored in the cell on the deep cell insertion port side. The difference in the time required to take out the recording medium from the cell between the case where it is stored and the case where it is accommodated in the back cell cannot be reflected in the arrangement of the recording medium.

  An object of the present invention is to provide a library device, a recording medium storage cell determination method, and a program that can solve the above-described problems.

  According to the first aspect of the present invention, the library device is a magazine for storing a recording medium to be inserted, and includes a deep cell in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium. Access frequency for determining whether or not the access frequency to the recording medium is higher than a predetermined entry-side criterion based on one or more magazines and an access history to the recording medium stored in the cell When the determination unit and the access frequency determination unit determine that the access frequency to the recording medium is higher than the entrance-side determination criterion, a cell storing the recording medium is a plurality of cells arranged in a deep cell. A storage cell determination unit that determines a predetermined cell as a cell closer to the insertion port.

  According to the second aspect of the present invention, the recording medium storage cell determination method is a magazine for storing a recording medium to be inserted, and a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium. A recording medium storage cell determination method performed by a library control unit that controls a library device including a magazine provided with one or more deep cells, and based on an access history to the recording medium stored in the cell An access frequency determination step for determining whether or not an access frequency to the recording medium is higher than a predetermined entrance-side determination criterion, and an access frequency to the recording medium is greater than or equal to the entrance-side determination criterion in the access frequency determination step The cell containing the recording medium is a cell closer to the insertion slot among the plurality of cells arranged in the deep cell. Comprising a storing cell determining step of determining the predetermined cell are, the.

  According to the third aspect of the present invention, the program is a magazine for storing a recording medium to be inserted, and has one deep cell in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium. Whether the frequency of access to the recording medium is higher than a predetermined entry-side criterion based on the history of access to the recording medium stored in the cell, to a computer that controls a library apparatus including two or more magazines provided In the access frequency determination step for determining whether or not, and in the access frequency determination step, when it is determined that the access frequency to the recording medium is higher than the entrance-side determination criterion, the cell storing the recording medium is A storage cell determination step for determining a predetermined cell which is a cell closer to the insertion port among the plurality of cells arranged in the deep cell; Is a program for executing.

  According to the present invention, the difference in the time required to take out the recording medium from the cell between the case where the recording medium is accommodated in the cell on the insertion port side of the deep cell and the case where it is accommodated in the cell on the back side, This can be reflected in the arrangement of the recording medium.

It is a schematic block diagram which shows the structure of the library apparatus which concerns on one Embodiment of this invention. It is explanatory drawing which shows the example of the positional relationship of each part in the library apparatus of the embodiment. It is explanatory drawing which shows the structure of the cell in the deep cell of the embodiment. It is explanatory drawing which shows the example of numbering of the cell address in the same embodiment. It is explanatory drawing which shows the structure of the cell in the pool of the embodiment. It is explanatory drawing which shows the numbering example of the pool number in the embodiment. It is a schematic block diagram which shows the function structure of the library system which concerns on the same embodiment. It is explanatory drawing which shows the example of the cell of the storage destination of the recording medium which the library control part in the same embodiment determines. It is explanatory drawing which shows the operation example of the library apparatus in case the library control part in the same embodiment changes the home cell of a recording medium. It is explanatory drawing which shows the operation example of the library system at the time of accessing the information of a recording medium in the same embodiment. 6 is a flowchart illustrating an example of a processing procedure for determining a home cell of a recording medium to be returned from the drive device to the magazine by the library control unit according to the embodiment. 6 is a flowchart illustrating an example of a processing procedure for determining a home cell of a recording medium to be returned from the drive device to the magazine by the library control unit according to the embodiment. 6 is a flowchart illustrating an example of a processing procedure for determining a home cell of a recording medium to be returned from the drive device to the magazine by the library control unit according to the embodiment. It is a schematic block diagram which shows the minimum structure of the library apparatus based on this invention.

Hereinafter, although embodiment of this invention is described, the following embodiment does not limit the invention concerning a claim. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.
FIG. 1 is a schematic configuration diagram showing a configuration of a library apparatus according to an embodiment of the present invention. This figure shows an example of the inside of the library apparatus as viewed from above.

  As shown in the figure, the library apparatus 200 includes a library apparatus main body 210 and a magazine 290, and the magazine 290 is inserted into the library apparatus main body 210. The library apparatus main body 210 includes a drive device 232, an accessor 233, and a library control unit 240.

The library device 200 is a device that reads / writes data (at least one of reading and writing) with respect to the recording medium 900 stored in the magazine 290.
The magazine 290 stores a cartridge type recording medium 900. The magazine 290 is provided so that it can be inserted into and removed from the library apparatus body 210 from the front surface of the library apparatus body 210. The user of the library apparatus 200 can extract the magazine 290 from the library apparatus main body 210, replace the recording medium 900, and insert the magazine 290 into the library apparatus main body 210 again. The recording medium 900 stored in the magazine 290 is a recording medium such as a magnetic tape.

  The library apparatus main body 210 is a part other than the magazine 290 in the library apparatus 200. The library apparatus main body 210 is provided with an insertion port for the magazine 290 and receives insertion of the magazine 290. With the magazine 290 inserted in the library apparatus main body 210, the accessor 233 takes out the recording medium from the magazine 290 and inserts it into the drive device 232. The drive device 232 reads / writes data from / to the inserted recording medium 900.

The magazine 290 is provided with a cell 291 that is a space for storing the recording medium 900. Further, two cells 291 are arranged in series in the insertion direction of the recording medium 900 to form a deep cell 292. Accordingly, the deep cell 292 can store two recording media 900.
The library apparatus 200 temporarily stores the recording medium 900 of the cell 291 on the near side (insertion port (surface F11) side for inserting the recording medium 900) when the recording medium 900 is taken out from the cell 291 on the back side of the deep cell 292. A evacuation area A11 is provided for evacuation.
Note that the insertion direction of the recording medium 900 into the deep cell 292 is indicated by an arrow A12. The recording medium 900 is inserted into the deep cell 292 from the insertion port (surface F11) which is an opening provided in the deep cell 292 (specifically, the cell 291 on the insertion port side or the back side). . Hereinafter, the opening of the deep cell 292 (the insertion port of the recording medium 900 into the deep cell 292) is also simply referred to as an insertion port. Note that the opening of the deep cell 292 is also the opening of the magazine 290.

The accessor 233 is installed so as to be movable in parallel with the opening (surface F11) of the deep cell 292, as indicated by an arrow A13, and conveys the recording medium 900 between the magazine 290 and the drive device 232. Further, the accessor 233 inserts and removes the recording medium 900 from the cell 291 and inserts and removes the recording medium 900 from the drive device 232. The accessor 233 inserts and removes the recording medium 900 from the opening (surface F11) of the deep cell 292 in a direction perpendicular to the opening (surface F11) as indicated by an arrow A12.
The drive device 232 reads / writes data from / to the recording medium 900 inserted into the drive device 232 by the accessor 233.

FIG. 2 is an explanatory diagram illustrating an example of the positional relationship between the units in the library apparatus 200.
As described above, the accessor 233 takes out the recording medium 900 from the magazine 290 and inserts it into the drive device 232. Specifically, the accessor 233 moves to the front of the opening (surface F11) of the deep cell 292 from which the recording medium 900 is to be taken out, extracts the recording medium 900 from the cell 291 and places it on the accessor 233 itself. Then, the accessor 233 moves to the front of the opening of the drive device 232 and inserts the recording medium 900 placed on the accessor 233 itself into the drive device 232.

  Note that the cell 291 from which the recording medium 900 is to be taken out is located on the back side of the deep cell 292 (back side in the insertion direction of the recording medium 900, that is, the back side with respect to the insertion port), and the front side (insertion port) of the deep cell 292. When another recording medium 900 is stored in the cell 291 on the back side, the accessor 233 retreats the recording medium 900 stored in the front cell 291 to the retreat area A11 and then the back cell 291. The recording medium 900 is taken out from the recording medium 900 and inserted into the drive device 232, and the retreated recording medium 900 is returned to the cell 291 on the near side.

  Further, the accessor 233 takes out the recording medium 900 from the drive device 232 and inserts it into the cell 291 of the magazine 290. Specifically, the accessor 233 moves to the front of the opening of the drive device 232, extracts the recording medium 900 from the drive device 232, and places it on the accessor 233 itself. Then, the accessor 233 moves to the front of the cell 291 where the recording medium 900 is to be inserted, and inserts the recording medium 900 placed on the accessor 233 itself into the cell 291.

  When the cell 291 where the recording medium 900 is to be stored is located at the back side of the deep cell 292 and another recording medium 900 is stored in the cell 291 on the near side (insertion side) of the deep cell 292, The accessor 233 evacuates the recording medium 900 stored in the front cell 291 to the evacuation area A11, then takes out the recording medium 900 from the drive device 232, inserts it into the back cell 291, and evacuates the recording medium. The medium 900 is returned to the cell 291 on the near side.

  In the example of this embodiment, the number of recording media 900 on which the accessor 233 can be placed at one time is one. However, the accessor 233 may be capable of mounting a plurality of recording media 900 at a time. In this embodiment, the drive device 232 can store one recording medium 900 at a time. However, the drive device 232 may be capable of storing a plurality of recording media 900 at a time.

  In the example of FIG. 2, five cells 291 are arranged in the longitudinal direction (width direction) of the opening of the magazine 290 (insertion slot for inserting the recording medium 900), and three cells 291 are arranged in the vertical direction (vertical direction). The two cells 291 are arranged side by side in the depth direction with respect to the opening of the magazine 290 (insertion direction of the recording medium 900), but the number of cells 291 is not limited to this. The number of cells 291 arranged in the longitudinal direction of the opening of the magazine 290 may be two or more. The number of cells 291 arranged in the vertical direction may be one or more.

  The number of cells 291 arranged in the depth direction with respect to the opening of the magazine 290 may be two or more. Note that at least one recording medium 900 smaller than the number of cells 291 arranged in the depth direction with respect to the opening of the magazine 290 is accommodated in the retreat area A11. For example, when three cells 291 are arranged in the depth direction with respect to the opening of the magazine 290, at least two recording media 900 are stored in the retreat area A11.

  FIG. 3 is an explanatory diagram showing the configuration of the cell 291 in the deep cell 292. As shown in the figure, a deep cell 292 is configured by a combination of a cell 291 on the near side and a cell 291 on the back side as viewed from the surface F11 which is an opening of the cell 291 (an opening of the magazine 290). One recording medium 900 can be stored in each of the cells 291 on the front side and the back side, and accordingly, the deep cell 292 can store two recording media 900.

FIG. 4 is an explanatory diagram showing an example of cell address numbering. In the example of the figure, the cell address 1 is assigned to the cell on the right side (side closer to the drive device 232) on the right side as viewed in the figure, from the back to the front (opening side), from the bottom to the top, and further The cell addresses 1, 2,..., 30 are assigned in order from right to left as viewed in the figure.
However, the cell address is not limited to that shown in FIG. The cell address is used by LTFS (Linear Tape File System) to specify the cell 291. The LTFS designates a cell 291 and causes the drive device 232 to store the recording medium 900 stored in the cell 291.
As will be described later, the library apparatus 200 updates the cell address (replaces the cell address among the plurality of cells 291).

The cells 291 arranged vertically in the magazine 290 are collectively referred to as a group and referred to as a pool.
FIG. 5 is an explanatory diagram showing the configuration of the cells 291 in the pool. As shown in the figure, vertically arranged cells 291 (three cells 291 in the example of this embodiment) constitute a pool 293.

  The accessor 233 can move up and down while moving in the longitudinal direction (left-right direction in FIG. 2) of the opening of the magazine 290 (opening of the deep cell 292). For this reason, in the cells 291 belonging to the same pool 293, it is considered that the time required for the accessor 233 to extract and move the recording medium 900 stored in the cell 291 and store it in the drive device 232 is the same. Can do. In the cells 291 belonging to the same pool 293, it can be considered that the time required for the accessor 233 to extract and move the recording medium 900 stored in the drive device 232 and store it in the cell 291 is the same. .

  FIG. 6 is an explanatory diagram showing an example of pool numbering. As shown in the figure, among the ten cells included in the magazine 290, each pool 293 on the near side as viewed from the opening of the magazine 290 is viewed from the side closer to the drive device 232 (right side as viewed in FIG. 6). Pool numbers 0, 1,... 4 are assigned in order. Subsequently, pool numbers 5, 6,... 9 are assigned in order from the side closer to the drive device 232 for each pool 293 on the back side as viewed from the opening of the magazine 290.

The pool number is the time required for the accessor 233 to extract and move the recording medium 900 stored in the cell 291 included in the pool 293 and store it in the drive device 232 (hereinafter referred to as the cell 291 to the drive device 232). The order of the length of the medium movement time) is shown. The smaller the pool number, the shorter the medium movement time.
In each pool 293 on the back side as viewed from the opening of the magazine 290, when the recording medium 900 is taken out from the cell 291 included in the pool 293, the recording medium 900 is stored in the cell 291 in front of the recording medium 900. Since it takes time to evacuate 900, a pool number larger than the pool 293 on the near side is assigned.

FIG. 7 is a schematic block diagram showing a functional configuration of the library system according to the present embodiment. As shown in the figure, the library system 1 includes a management device 100 and a library device 200. The management device 100 includes a user interface unit 110, a first bus communication unit 121, a first LAN communication unit 122, and a management processing unit 190. As described with reference to FIG. 1, the library apparatus 200 includes the library apparatus main body 210 and the magazine 290, and the magazine 290 is inserted into the library apparatus main body 210. The library apparatus main body 210 includes a drive device 232, an accessor 233, and a library control unit 240.
Further, the library apparatus main body 210 includes a second bus communication unit 221 and a second LAN communication unit 222. The library control unit 240 includes an access frequency determination unit 241 and a storage cell determination unit 242.

The management device 100 is a device that manages the library device 200. In particular, the management apparatus 100 operates as an LTFS (Linear Tape File System). The management device 100 is realized using, for example, a computer. Alternatively, the management device 100 may be configured using hardware dedicated to the management device 100.
The user interface unit 110 includes input devices such as a keyboard and a mouse, and accepts user operations. The user interface unit 110 includes a display screen such as a liquid crystal panel and displays various types of information.

  The first bus communication unit 121 connects to the bus (host bus) of the library apparatus 200 via the second bus communication unit 221 to perform communication. In particular, the first bus communication unit 121 transmits various commands to the library apparatus 200. For example, the first bus communication unit 121 sends a medium movement command for moving the recording medium 900 from the cell 291 to the drive device 232 and a medium movement command for moving the recording medium 900 from the drive device 232 to the cell 291. The data is transmitted to the library control unit 240 via the communication unit 221. The first bus communication unit 121 also sends a file read (Read) command from the recording medium 900 and a file write (Write) command to the recording medium 900 via the second bus communication unit 221. Send to.

  The first LAN communication unit 122 communicates with the library control unit 240 via the second LAN communication unit 222. In particular, the first LAN communication unit 122 transmits access information that is a basis for calculating the access frequency to the recording medium 900 to the library control unit 240. The access information here may be access history information to the recording medium 900 or information including information on the frequency of access to the recording medium 900.

  The management processing unit 190 executes the LTFS function. In particular, the management processing unit 190 causes the user interface unit 110 to display various types of information related to the operation of the library apparatus 200, and sends various commands via the second bus communication unit 221 according to user operations received by the user interface unit 110. It transmits to the library apparatus 200. The management processing unit 190 is realized by, for example, a CPU (Central Processing Unit) provided in the management apparatus 100 reading and executing a program from a storage device provided in the management apparatus 100.

The second bus communication unit 221 communicates with the first bus communication unit 121. In particular, the second bus communication unit 221 receives various commands for the library device 200 and transfers the commands to the library control unit 240 or the drive device 232 via the bus.
The second LAN communication unit 222 communicates with the first LAN communication unit 122. In particular, the second LAN communication unit 222 receives access information to the recording medium 900.

  The library control unit 240 controls the accessor 233 to execute the movement of the recording medium 900 from the cell 291 to the drive device 232 and the movement of the recording medium 900 from the drive device 232 to the cell 291. In particular, when the library control unit 240 moves the recording medium 900 from the drive device 232 to the cell 291 (returns to the magazine 290), the library control unit 240 stores the storage medium cell 291 of the recording medium 900 based on the access frequency to the recording medium 900. To change. The library control unit 240 is realized, for example, when a CPU included in the library apparatus 200 reads and executes a program from a storage device included in the library apparatus 200.

  The access frequency determination unit 241 determines whether the access frequency to the recording medium 900 to be returned to the magazine 290 is higher than a predetermined determination criterion. In particular, the access frequency determination unit 241 determines whether or not the access frequency to the recording medium 900 returned to the magazine 290 is higher than a predetermined entrance-side determination criterion. Here, the entrance-side determination criterion is a criterion for determining whether or not to store the recording medium 900 in a predetermined cell 291 that is closer to the insertion port of the deep cell 292.

Here, the cell closer to the insertion slot is a cell 291 located closer to the insertion slot than the other cells 291. As described with reference to FIGS. 2 to 3, when the deep cell 292 includes the cell 291 on the insertion port (surface F11) side and the cell 291 on the back side, the cell 291 on the insertion port side becomes the insertion port. This corresponds to an example of a cell at a closer position.
On the other hand, when the deep cell includes three cells, the cell on the insertion slot side, the intermediate cell, and the cell on the back side, only the cell on the insertion slot side is a cell closer to the insertion slot. Alternatively, the cell on the insertion port side and the intermediate cell may be cells closer to the insertion port.
When the deep cell includes n (n is a positive integer of n ≧ 2) cells arranged in series in the insertion direction of the recording medium, i (i is 1 ≦ i ≦ n−1) from the insertion port side. (Positive integer) cells need only be cells closer to the insertion slot.

  Further, the access frequency determination unit 241 determines whether or not the access frequency to the recording medium 900 returned to the magazine 290 is higher than a predetermined drive-side determination criterion. Here, the drive-side standard is a criterion for determining whether or not to determine the recording medium 900 as a cell 291 included in a predetermined deep cell 292 that is a deep cell 292 closer to the drive device 232. .

The deep cell 292 closer to the drive device 232 here is a deep cell 292 located closer to the drive device than the other deep cells 292. In the cell grouping described with reference to FIG. 8, the deep cells 292 including the cells 291 with pool numbers 0 to 1 (that is, two of the five deep cells 292 shown in FIG. The deep cell 292) corresponds to an example of the deep cell 292 at a position closer to the drive device 232.
However, the setting of the deep cell closer to the drive device is not limited to this. When the magazine includes m (m is a positive integer of m ≧ 2) deep cells, j (j is a positive integer of 1 ≦ j ≦ m−1) deep cells from the side closer to the drive device, A deep cell closer to the drive device may be used.

  The storage cell determination unit 242 determines a cell 291 (home cell of the recording medium 900) that stores the recording medium 900 based on the determination result of the access frequency determination unit 241. The home cell of a recording medium here is a cell which accommodates the recording medium.

  FIG. 8 is an explanatory diagram illustrating an example of candidates for the storage destination cell 291 of the recording medium 900 determined by the library control unit 240. As shown in the figure, the library control unit 240 determines a storage cell 291 (home cell) of the recording medium 900 based on the access frequency to the recording medium 900. Specifically, the access frequency determination unit 241 of the library control unit 240 classifies the access frequency to the recording medium 900 into any one of five classes 1 to 5.

  Class 1 is a class when there are three or more accesses in the last less than 24 hours, and is the class with the highest access frequency. Here, the library control unit 240 moves the recording medium 900 from the cell 291 to the drive device 232 and moves a series of operations from the drive device 232 to any one of the cells 291 (returns to the magazine 290) once. It counts as an access, and this access is also included in the access count. When the access frequency determination unit 241 determines that the access frequency of the recording medium 900 to be returned to the magazine 290 belongs to class 1, the storage cell determination unit 242 determines that the pool number 0 or the medium movement time with the drive device 232 is particularly short. The cell 291 in any one of the pools 293 is determined as the storage destination (home cell) of the recording medium 900. Hereinafter, a cell included in a pool having a pool number n (n is a positive integer satisfying 1 ≦ n ≦ 10) is referred to as a cell having a pool number n.

  When there is an empty cell (cell 291 that does not store the recording medium 900) or the original home cell in the cell 291 with the pool number 0 or 1, the library control unit 240 returns the cell 291 to the magazine 290. Determine the storage location. On the other hand, if there is no empty cell and no original home cell, the library control unit 240 creates an empty cell by moving the recording medium 900 stored in the cell of the pool, as will be described later. The storage destination (home cell) of the recording medium 900 to be returned to 290 is determined. The same applies to class 2, class 4, and class 5 described below.

The recording medium 900 that has been accessed three times or more in the last 24 hours is a cell arranged on the insertion port side of the deep cell 292 (and hence a cell closer to the insertion port than a cell arranged on the back side). It is stored in a cell of a certain pool number 0 or 1. Therefore, the determination criterion that “there is three or more accesses within the last 24 hours” corresponds to an example of the entrance determination criterion.
The recording medium 900 that has been accessed three or more times in the last 24 hours is stored in the pool 293 cell of pool number 0 or 1 closer to the drive device 232 than the pool 293 cell of pool numbers 2 to 4. The Therefore, the determination criterion that “there is three or more accesses within the last 24 hours” corresponds to an example of the drive-side determination criterion.

Class 2 is a class when there are two accesses in the last less than 24 hours, and is a class with a relatively high access frequency. When the access frequency determination unit 241 determines that the access frequency of the recording medium 900 to be returned to the magazine 290 belongs to class 2, the storage cell determination unit 242 uses the pool 293 with a relatively short medium movement time with the drive device 232. Any one of the cells 291 in the pool numbers 2 to 4 is determined as the storage destination (home cell) of the recording medium 900.
The recording medium 900 that has been accessed twice in the last less than 24 hours is stored in any one of the pool numbers 2 to 4 that are cells arranged on the insertion port side of the deep cell 292. Therefore, the determination criterion “there were two accesses in the last 24 hours” corresponds to an example of the entrance determination criterion.

Class 3 is a class when the latest access interval is 24 hours or more and less than 48 hours. When the access frequency determination unit determines that the access frequency of the recording medium 900 returned to the magazine 290 belongs to class 3, the storage cell determination unit 242 keeps the home cell of the recording medium 900 as the current home cell. That is, the storage cell determination unit 242 determines the storage destination of the recording medium 900 as the cell 291 from which the medium has been taken out. This is because the home cell is not changed during automatic backup, assuming that automatic backup of data is performed every 24 hours.
Note that the criterion for class 3 is not limited to the access interval of 24 hours or more and less than 48 hours shown in FIG. For example, when automatic backup is performed between 2 am and 3 am, the class 3 criterion may be a condition such as “the current time is in the range of 2 am to 3 am”.

Class 4 is a class when the latest access interval is 48 hours or more and less than 120 hours, and is a class with a relatively low access frequency. When the access frequency determination unit 241 determines that the access frequency of the recording medium 900 to be returned to the magazine 290 belongs to the class 4, the storage cell determination unit 242 is a pool 293 having a slightly longer medium movement time with the drive device 232. The cell 291 with the pool number 5 or 6 is determined as the storage destination (home cell) of the recording medium 900.
The recording medium 900 having the latest access interval of 48 hours or more and less than 120 hours is stored in the pool 293 cell of the pool number 5 or 6 closer to the drive device 232 than the pool 293 cell of the pool numbers 7 to 9. Therefore, the determination criterion “the latest access interval is 48 hours or more and less than 120 hours” corresponds to an example of the drive side determination criterion.

  Class 5 is a class when the latest access interval is 120 hours or more, and is a class with low access frequency. When the access frequency determination unit 241 determines that the access frequency of the recording medium 900 returned to the magazine 290 belongs to the class 5, the storage cell determination unit 242 is a pool that is a pool 293 having a long medium movement time with the drive device 232. Any one of the cells 291 having the numbers 7 to 9 is determined as a storage destination (home cell) of the recording medium 900.

Note that the time used for the access frequency determination criterion may be a time when the library apparatus 200 is activated or may include a time when the library apparatus 200 is stopped.
Note that the reference by which the library control unit 240 determines the home cell is not limited to that shown in FIG. The standard for the library controller 240 to determine the home cell is that the recording medium 900 having a relatively short access frequency is stored in the cell 291 having a relatively short medium moving time to the drive device 232 and the recording medium 900 having a relatively long access frequency is stored. May be stored in the cell 291 having a relatively long medium moving time to the drive device 232.

  FIG. 9 is an explanatory diagram illustrating an operation example of the library apparatus 200 when the library control unit 240 changes the home cell of the recording medium 900. In order to make the figure easy to see, the lowermost cell 291 (cell addresses 1, 2, 7, 8, 13, 14, 19, 20, 25, 26) among the uppermost three cells 291 of the magazine 290 is shown in FIG. However, the cell 291 determined by the library control unit 240 as the home cell is not limited to the lowest cell 291.

  FIG. 9A shows an example of the operation of the library apparatus 200 when the accessor 233 takes out the recording medium 900 from the cell 291 and moves it to the drive apparatus 232. As shown in FIG. 5A, the accessor 233 moves the recording medium 900 (hereinafter referred to as medium A) stored in the cell 291 at the cell address 14 to the drive device 232. In addition to medium A, recording medium 900 is also stored in cell 291 at cell address 8 (hereinafter referred to as medium B). On the other hand, the cell 291 at the cell address 2 is an empty cell (the recording medium 900 is not stored). The cell 291 (cell address 14) in which the medium A is stored is included in the pool 293 having the pool number 2.

FIG. 2B shows an example of a state in which the recording medium 900 is stored in the drive device 232. In FIG. 5B, the medium A moved by the accessor 233 in FIG.
FIG. 5C shows an example of the operation of the library apparatus 200 when the accessor 233 takes out the recording medium 900 from the drive apparatus 232 and moves it to the cell 291 (returns to the magazine 290). As shown in FIG. 6C, the accessor 233 returns the medium A stored in the drive device 232 to the magazine 290.

  Here, the management processing unit 190 determines that the access frequency of the medium A belongs to the class 1, and searches the cell 291 with the pool number 0 or 1 for the storage destination cell 291 of the medium A. Among the cells 291 shown in FIG. 9, the cells with cell addresses 2 and 8 correspond to the cells 291 with the pool number 0 or 1. Among these, the medium B is stored in the cell 291 at the cell address 8. On the other hand, the cell 291 at the cell address 2 is an empty cell. Therefore, the management processing unit 190 determines the storage destination of the medium A as the cell 291 at the cell address 2.

FIG. 4D shows an example of a state where the recording medium 900 is returned to the magazine 290. In FIG. 4D, the medium A moved by the accessor 233 in FIG. 4C is stored in the cell 291 at the cell address 2.
The home cell of the medium A is changed from the cell 291 with pool number 2 to the cell 291 with pool number 0. As described above, the home cell of the frequently accessed recording medium 900 is changed to the cell 291 in which the medium moving time to the drive device 232 is short.

Also, the management processing unit 190 exchanges the cell address 14 of the original home cell of the medium A with the cell address 2 of the new home cell. Specifically, the management processing unit 190 stores a table in which the position information for specifying each cell 291 at the position of the cell 291 and the cell address of the cell 291 are associated one-to-one. The cell address 14 of the original home cell of the medium A is exchanged with the cell address 2 of the new home cell.
Thereby, the library apparatus 200 can hide the change of the home cell from the management apparatus 100, and the management apparatus 100 does not need to perform any processing regarding the change of the home cell.

FIG. 10 is an explanatory diagram illustrating an operation example of the library system 1 when accessing information on the recording medium 900.
When the user performs a read operation on a file in a certain recording medium 900 (hereinafter referred to as medium A) (sequence S101), the management apparatus 100 updates access information to the medium A (sequence S102). ). Specifically, the management apparatus 100 adds the current access history to the access history to the medium A.

Then, the management apparatus 100 transmits to the library apparatus 200 a medium movement command that instructs to load (insert) the medium A into the drive apparatus 232 (sequence S103).
In the library apparatus 200, the library control unit 240 controls the accessor 233 to load the medium A into the drive apparatus 232 (sequence S104).
When the drive device 232 notifies the library control unit 240 of the completion of loading of the medium A into the drive device 232 (sequence S105), the library control unit 240 notifies the management device 100 of the completion of loading of the medium A into the drive device 232. Notification is made (sequence S106).

Upon receiving the notification of completion of loading, the management apparatus 100 transmits a Read command for reading the data on the medium A to the library apparatus 200 in accordance with the user operation in step S101 (sequence S111).
In the library device 200, the drive device 232 reads data from the medium A in accordance with a command from the management device 100, and transmits the data to the management device 100 via the second bus communication unit 221 (sequence S112).
When the data reading is completed, management apparatus 100 displays a data reading completion notification (sequence S113).

Further, the management apparatus 100 transmits a medium movement command for instructing to move the medium A to the home cell to the library apparatus 200 (sequence S121).
In the library apparatus 200, the library control unit 240 that has received the medium movement command in the sequence S121 requests the management apparatus 100 for access information to the medium A (sequence S122). In response to the request, the management apparatus 100 transmits access information to the medium A to the library apparatus 200 (sequence S123).

In the library apparatus 200, the library control unit 240 that has acquired the access information to the medium A controls the accessor 233 to eject (take out) the medium A from the drive apparatus 232 (sequence S124).
When the drive device 232 notifies the library controller 240 of the completion of ejection of the medium A (sequence S125), the library controller 240 calculates the access frequency to the medium A based on the access information acquired in sequence S123. As described with reference to FIG. 4, the home cell of the medium A is determined (sequence S126).

Then, the library control unit 240 determines whether or not the determined home cell is different from the original home cell (sequence S127).
When it is determined that the determined home cell is the same as the original home cell (sequence S127: NO, the library control unit 240 controls the accessor 233 to change the medium A to the current home cell (the same as the original home cell). (Sequence S131).
Thereafter, the library control unit 240 notifies the management apparatus 100 of a return completion notification of the medium A to the home cell via the second bus communication unit 221 (sequence S151).
After the sequence S151, the process of FIG.

On the other hand, when it is determined in sequence 127 that the home cell determined in sequence S126 is different from the original home cell (sequence S127: YES), library control unit 240 controls accessor 233 to change medium A to a new one. It is stored (returned) in the home cell (home cell determined in sequence S126) (sequence S141). Then, the library control unit 240 exchanges the cell address of the new home cell of the medium A and the cell address of the original home cell of the medium A (sequence S142).
After sequence S142, the process proceeds to sequence S151.

FIGS. 11 to 12 are flowcharts illustrating an example of a processing procedure in which the library control unit 240 determines the home cell of the recording medium 900 to be returned from the drive device 232 to the magazine 290. Hereinafter, the recording medium 900 returned from the drive device 232 to the magazine 290 is referred to as a target medium.
In this process, the library control unit 240 determines whether or not the latest access interval to the target medium is less than 24 hours (step S201). That is, the library control unit 240 determines whether the time from the previous access to the target medium to the current access is less than 24 hours.

  If it is determined that the latest access interval is less than 24 hours (step S201: YES), the library control unit 240 determines whether the number of accesses within the latest 24 hours is three or more (step S211). Specifically, the library control unit 240 determines whether or not the number of accesses to the target medium in the latest 24 hours is three or more including the current access. As described above, the number of accesses referred to here is counted as a series of operations from inserting the recording medium 900 from the magazine 290 to the drive device 232 and returning from the drive device 232 to the magazine 290.

When it is determined that the number of accesses is 3 or more (step S211: YES), the library control unit 240 determines the home cell of the target medium as the cell 291 with the pool number 0 or 1 (step S221). In the following, the pool determined by the library control unit 240 is expressed in nm, where n is the minimum value of the pool number and m is the maximum value. In step S221, n = 0 and m = 1.
Next, the library control unit 240 starts a loop L11 for performing processing on the pool 293 having the pool numbers n to m (step S241). Hereinafter, the pool 293 that is the processing target in the loop (the pool 293 in which the control variable of the loop indicates the pool number) is referred to as a target pool.

Then, the library control unit 240 determines whether or not the target pool is the same as the current home cell pool 293 (step S242).
When it is determined that it is the same as the current home cell pool 293 (step S242: YES), the library control unit 240 determines the home cell of the target medium as the current home cell, and ends the loop L11 ( Step S251).
Then, the library control unit 240 controls the accessor 233 to move (return) the target medium to the determined home cell (step S441).
After step S441, the processing of FIGS.

On the other hand, when it is determined in step S211 that the number of accesses is less than 3 (step S211: NO), the library control unit 240 determines the home cell of the target medium as one of the cells 291 of the pool numbers 2 to 4. (Step S231). In the case of step S231, n = 2 and m = 4.
After step S231, the process proceeds to step S241.

  On the other hand, when it is determined in step S242 that the target pool is different from the pool 293 of the current home cell (step S242: NO), the library control unit 240 starts a loop L12 that performs processing for each cell 291 in the target pool. (Step S261). Hereinafter, a cell 291 that is a processing target in a loop (a cell 291 indicated by a control variable of the loop) is referred to as a target cell.

Next, the library control unit 240 determines whether or not the target cell is an empty cell (step S262).
When it is determined that the target cell is an empty cell (step S262: YES), the library control unit 240 determines the home cell of the target medium as the target cell, and ends the loop L12 (step S271).
Then, the library control unit 240 controls the accessor 233 to move (return) the target medium to the determined home cell (step S431).
In addition, the library control unit 240 exchanges the cell address of the original home cell of the target medium with the cell address of the new home cell (step S432).
After step S432, the processes of FIGS.

  On the other hand, if it is determined in step S262 that the target cell is not an empty cell (step S262: NO), the library control unit 240 performs a loop L12 termination process (step S281). Specifically, the library control unit 240 determines whether or not the processing of the loop L12 has been performed for all the cells that are the processing target in the loop L12. If it is determined that there is a cell that has not been processed, the process returns to step S261, and the processing of loop L12 is continued for the unprocessed cell. On the other hand, when it is determined that processing has been performed for all cells, the loop L12 is terminated.

  When the loop L12 is terminated in step S281, the library control unit 240 performs a termination process for the loop L11 (step S282). Specifically, the library control unit 240 determines whether or not the processing of the loop L11 has been performed for all the pools that are processing targets in the loop L11. If it is determined that there is a pool that has not been processed, the process returns to step S241, and the processing of the loop L11 is continued for the unprocessed pool. On the other hand, if it is determined that processing has been performed for all pools, the loop L11 is terminated.

When the loop L11 is terminated in step S282, the library control unit 240 starts a loop L21 that performs processing for the pool 293 having the pool numbers n to m (step S291). In this case, since no empty cell is found in the processing of loop L11, in loop L21, the library control unit 240 attempts to replace the home cell of the target medium with the home cell of another recording medium 900.
Next, the library control unit 240 starts a loop L22 that performs processing for each cell 291 in the target pool (step S301).

Then, the library control unit 240 determines whether the access frequency to the recording medium 900 stored in the target cell is lower than the access frequency to the target medium (step S302).
When it is determined that the access frequency to the recording medium 900 stored in the target cell is equal to or higher than the access frequency to the target medium (step S302: NO), the library control unit 240 performs a termination process of the loop L22 ( Step S311). Specifically, the library control unit 240 determines whether or not the processing of the loop L22 has been performed for all the cells that are the processing target in the loop L22. If it is determined that there is a cell that has not been processed, the process returns to step S291, and the processing of the loop L22 is continued for the unprocessed cell. On the other hand, if it is determined that processing has been performed for all cells, the loop L22 is terminated.

  When the loop L22 is terminated in step S311, the library control unit 240 performs a termination process for the loop L21 (step S321). Specifically, the library control unit 240 determines whether or not the processing of the loop L21 has been performed for all the pools that are processing targets in the loop L21. If it is determined that there is a pool that has not been processed, the process returns to step S301, and the processing of loop L21 is continued for the unprocessed pool. On the other hand, if it is determined that processing has been performed for all pools, the loop L21 is terminated.

When the loop L21 is completed in step S321, the library control unit 240 determines that the home cell of the target medium remains the current home cell (step S331). In this case, since no empty cell is found in the pool 293 for searching for a new home cell, and the recording medium 900 for exchanging the home address is not found, the library control unit 240 maintains the current home cell.
After step S331, the process proceeds to step S441.

On the other hand, when it is determined in step S302 that the access frequency to the recording medium 900 stored in the target cell is lower than the access frequency to the target medium (step S302: YES), the library control unit 240 determines that the target cell The home cell of the recording medium 900 stored in the storage medium is replaced with the home cell of the target medium.
Specifically, the library control unit 240 controls the accessor 233 to move the recording medium 900 stored in the target cell to the home cell of the target medium (step S341).

Next, the library control unit 240 determines whether or not two recording media 900 are stored in the deep cell 292 including the home cell of the target medium (step S342).
When it is determined that two recording media 900 are stored (step S342: YES), the library control unit 240 determines whether or not the home cell of the target medium is located on the back side when viewed from the opening of the magazine 290. Determination is made (step S351).

When it is determined that the home cell of the target medium is located on the back side (step S351: YES), the library control unit 240 exchanges cell addresses before and after the deep cell 292 including the home cell of the target medium (step S361).
Next, the library control unit 240 determines the target cell as the home cell of the target medium (step S371).
After step S371, the process proceeds to step S431.

On the other hand, when it is determined in step S201 that the latest access interval is 24 hours or longer (step S201: NO), the library control unit 240 determines whether or not the latest access interval is 24 hours or more and less than 48 hours. (Step S381). That is, the library control unit 240 determines whether the time from the previous access to the target medium to the current access is 24 hours or more and less than 48 hours.
When it is determined that the latest access interval is 24 hours or longer and less than 48 hours (step S381: YES), the library control unit 240 determines to leave the home cell of the target medium as the current home cell ( Step S391).
After step S391, the process proceeds to step S441.

On the other hand, if it is determined in step S381 that the most recent access interval is not less than 24 hours and less than 48 hours (step S381: NO), the library control unit 240 determines that the most recent access interval is not less than 48 hours and less than 120 hours. It is determined whether or not (step S401). That is, the library control unit 240 determines whether the time from the previous access to the target medium to the current access is 48 hours or more and less than 120 hours.
When it is determined that the latest access interval is 48 hours or longer and less than 120 hours (step S401: YES), the library control unit 240 determines the home cell of the target medium as the cell 291 with the pool number 5 or 6 (step S401). S411). In step S411, n = 5 and m = 6.
After step S411, the process proceeds to step S241.

On the other hand, if it is determined in step S381 that the most recent access interval is not less than 48 hours and less than 120 hours (step S401: NO), the library control unit 240 sets the home cell of the target medium as any of the pool numbers 7-9. That cell 291 is determined (step S421). In the case of step S421, n = 7 and m = 9.
After step S421, the process proceeds to step S241.
On the other hand, when it is determined in step S342 that two recording media 900 are not stored (step S342: NO), the process proceeds to step S371.
On the other hand, if it is determined in step S351 that the home cell of the target medium is located on the near side (step S351: NO), the process proceeds to step S371.

  As described above, the access frequency determination unit 241 determines whether the access frequency to the recording medium 900 is higher than a predetermined entrance-side determination criterion based on the access history to the recording medium 900 stored in the cell 291. Determine. When the access frequency determination unit 241 determines that the access frequency to the recording medium 900 is higher than the entrance-side determination criterion, the storage cell determination unit 242 selects the cell that stores the recording medium 900 as the deep cell 292. Among the plurality of cells 291 arranged in the cell 291 is determined as a predetermined cell 291 that is a cell 291 closer to the insertion slot.

  As a result, the library apparatus 200 stores the recording medium 900 having a relatively high access frequency in the cell 291 that is a cell 291 that requires a relatively short time to remove the recording medium 900 from the cell 291 and that is relatively close to the insertion slot. be able to. In this regard, the library apparatus 200 has the recording medium 900 to the recording medium in the case where the recording medium 900 is accommodated in the cell 291 on the insertion opening side of the deep cell 292 and in the case where it is accommodated in the cell 291 on the back side. The difference in the time required to take out 900 can be reflected in the arrangement of the recording medium 900 (the position of the cell 291 that stores the recording medium 900).

  In addition, the access frequency determination unit 241 determines whether the access frequency to the recording medium 900 stored in the cell 291 is higher than the drive-side determination criterion. Then, when the access frequency determination unit 241 determines that the access frequency to the recording medium 900 is higher than the drive-side determination criterion, the storage cell determination unit 242 selects a plurality of cells 291 that store the recording medium 900 as a plurality of cells 291. Of the deep cells 292, the cell 291 included in the predetermined deep cell 292, which is the deep cell 292 closer to the drive device 232, is determined.

  As a result, the library apparatus 200 transfers the recording medium 900 having a relatively high access frequency to the cell 291 relatively close to the drive apparatus 232, which is a cell 291 that requires a relatively short time to transport the recording medium 900 to the drive apparatus 232. Can be stored. In this regard, the library apparatus 200 reflects the difference in the time required for transporting the recording medium 900 from the cell 291 to the drive apparatus 232 for each cell 291 in the arrangement of the recording medium 900 (the position of the cell 291 that stores the recording medium 900). Can be made.

Next, the minimum configuration of the present invention will be described with reference to FIG.
FIG. 14 is a schematic block diagram showing the minimum configuration of the library apparatus according to the present invention. The library apparatus 10 shown in the figure includes a magazine 11, an access frequency determination unit 12, and a storage cell determination unit 13.

  With such a configuration, the magazine 11 is a magazine for storing a recording medium to be inserted, and is provided with one or more deep cells in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium. It is a magazine. Further, the access frequency determination unit 12 determines whether the access frequency to the recording medium is higher than a predetermined entrance-side determination criterion based on the access history to the recording medium stored in the cell. Further, when the access frequency determination unit 12 determines that the access frequency to the recording medium is higher than the entrance-side determination criterion, the storage cell determination unit 13 arranges the cell that stores the recording medium in the deep cell. A predetermined cell that is closer to the insertion slot among the plurality of cells is determined.

  As a result, the library apparatus 10 can store a recording medium having a relatively high access frequency in a cell relatively close to the insertion slot, which is a cell having a relatively short time required to take out the recording medium from the cell. In this respect, the library apparatus 10 has a time required to take out the recording medium from the cell in the case where the recording medium is accommodated in the cell on the deep cell insertion port side and in the cell on the deep side. The difference can be reflected in the arrangement of the recording medium (the position of the cell storing the recording medium).

A program for realizing all or part of the functions of the library control unit 240 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. You may perform the process of each part. Here, the “computer system” includes an OS and hardware such as peripheral devices.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Library system 10,200 Library apparatus 11,290 Magazine 12,241 Access frequency determination part 13,242 Storage cell determination part 100 Management apparatus 110 User interface part 121 First bus communication part 122 First LAN communication part 190 Management processing part 210 Library device main body 221 Second bus communication unit 222 Second LAN communication unit 232 Drive device 233 Accessor 240 Library control unit

Claims (4)

A magazine for storing a recording medium to be inserted, and a magazine provided with one or more deep cells in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium;
An access frequency determination unit that determines whether the access frequency to the recording medium is higher than a predetermined entrance-side determination criterion based on an access history to the recording medium stored in the cell;
When the access frequency determination unit determines that the access frequency to the recording medium is higher than the entrance-side determination criterion, the cell that stores the recording medium is inserted into a plurality of cells arranged in a deep cell. A storage cell determination unit that determines a predetermined cell that is a closer cell;
A library device comprising: A drive device that performs at least one of reading and writing of data with respect to the inserted recording medium;
An accessor for taking out the recording medium stored in the cell of the magazine from the cell, moving it toward the drive device, and inserting the recording medium into the drive device;
The magazine is provided with a plurality of deep cells along the moving direction of the accessor,
The access frequency determination unit determines whether the access frequency to the recording medium stored in the cell is higher than a predetermined drive-side determination criterion;
The storage cell determination unit, when the access frequency determination unit determines that the access frequency to the recording medium is higher than the drive-side determination criterion, the storage cell determination unit determines the cell storing the recording medium as the plurality of deep cells. The library apparatus according to claim 1, wherein a cell included in a predetermined deep cell that is a deep cell closer to the drive device is determined. A library for controlling a library device comprising a magazine for storing a recording medium to be inserted, the magazine having at least one deep cell in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium A recording medium storage cell determination method performed by a control unit,
An access frequency determination step for determining whether the access frequency to the recording medium is higher than a predetermined entrance-side determination criterion based on an access history to the recording medium stored in the cell;
In the access frequency determination step, when it is determined that the access frequency to the recording medium is higher than the entrance-side determination criterion, a cell that stores the recording medium is a plurality of cells arranged in the deep cell. A storage cell determination step for determining a predetermined cell that is a cell closer to the insertion slot;
A method for determining a storage medium containing cell. A computer for controlling a library apparatus comprising a magazine for storing a recording medium to be inserted, the magazine having at least one deep cell in which a plurality of cells storing the recording medium are arranged in series in the insertion direction of the recording medium In addition,
An access frequency determination step for determining whether the access frequency to the recording medium is higher than a predetermined entrance-side determination criterion based on an access history to the recording medium stored in the cell;
In the access frequency determination step, when it is determined that the access frequency to the recording medium is higher than the entrance-side determination criterion, a cell that stores the recording medium is a plurality of cells arranged in the deep cell. A storage cell determination step for determining a predetermined cell that is a cell closer to the insertion slot;
A program for running

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