JP2004310810A - Device and method for controlling medium and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the durability by reducing the number of operation times of an accessor and to provide a cartridge library device, in which the operation time is shortened. <P>SOLUTION: Before instructing a process for a medium holding means, the ID of the accessor for performing the process is associated with the ID of the medium holding means so that the registration information on the failed accessor, whether the combination thereof failed in the past or not, is checked (s101). For the medium holding means for performing the process, when the registration that all of the accessors 7 failed in the past exists (s102, YES), the accessor having the minimum moving distance is selected (s104). When an accessor 7 having no registration of the failure in the past exists (s102, NO), the unregistered accessor 7 is selected (s103). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention, the media controller, in particular a cartridge library system that performs control to reduce the number of operations of the accessor, and cartridge library control method, a cartridge library control program.
[0002]
[Prior art]
As a method of storing data in a computer system, a cartridge library device that manages a magnetic recording medium in cartridge units is used. In a cartridge library device, it is necessary to increase the processing efficiency of storing, taking out, transporting, and the like of a cartridge, and management and control for increasing the processing efficiency in a conventional cartridge library device are performed (for example, Patent Documents 1, 2, and 3). reference.).
[0003]
[Patent Document 1]
JP-A-2002-208200 (pages 4 to 5, FIG. 4)
[Patent Document 2]
JP-A-4-125206 (Section 5-6, FIG. 3)
[Citation 3]
JP-A-10-255359 (Section 3, FIG. 2)
Patent Literature 1 discloses a technique for inspecting a cell for accommodating a cartridge and preventing a trouble due to a failed cell from occurring. Patent Document 2 by selecting the accessor that is located closer to the insertion-discharge mechanism section at the time of injection and ejection of the cartridge, techniques to improve the process efficiency is disclosed. Patent Literature 3 discloses a technique for preventing deviation in picker life by selecting a picker with a small cumulative usage amount.
[0004]
[Problems to be solved by the invention]
However, the conventional cartridge library apparatus has the following problems that lower the processing efficiency.
[0005]
The first problem is turned into that to implement a retry operation to replace the accessor to move the cartridge constantly, it is that the cartridge movement time may increase. The reason is as follows. For a particular accessor, there may be a cell that is difficult to access due to poor positioning, degraded stop position accuracy, or the like. In addition, the accessors selected may be biased for a certain cell. For example, when a method of selecting an accessor arranged near a charging / discharging mechanism at the time of charging / discharging of a cartridge described in Patent Literature 2 is used, first, depending on the position of a cell in a cartridge library device, The selected accessor is the same accessor every time. If access is made to a cell which the selected accessor is not good at every time, access often fails. Then, the retry operation for exchanging the accessor is performed to constantly move the cartridge, and the cartridge moving time increases.
[0006]
The second problem is that if the number of retries of the accessor increases for the above reason, one of the duplicated accessors may be separated from the device, resulting in a degenerate operation, which lowers the reliability of the entire device. That is.
[0007]
An object of the present invention improves the durability by the operation number reduction of the accessor is to provide a cartridge library device with reduced operating time.
[0008]
[Means for Solving the Problems]
The medium control device according to claim 1, wherein the medium control device includes a plurality of transport units that transport a medium and a plurality of medium holding units that hold a medium, wherein the plurality of medium holding units during the transport of the medium are provided. Failure information storage means for storing the success or failure of processing of the transport means for each means, and the plurality of transport means for the medium holding means at the time of transporting the medium before starting the processing of the transport means for a certain medium holding means Confirmation means for confirming the success or failure of the processing up to now from the information of the failure information storage means, and based on the result confirmed by the confirmation means, the medium holding at the time of transporting the medium to the transportation means without failure information so far. Selecting means for performing processing on the means.
[0009]
The medium control device according to claim 2, based on the result of the check by said check means, when to the all of the plurality of transport means there is a failure information ever, the selection means is the least failure count The present invention is characterized in that a transporting means performs a process for the certain medium holding means at the time of transporting the medium.
[0010]
The medium control device according to claim 3, wherein, based on a result confirmed by the confirmation unit, when there is no failure information for all of the plurality of transport units, or when there is no failure information, the selection unit performs The present invention is characterized in that the transporting means having the shortest distance from the certain medium holding means performs processing on the certain medium holding means at the time of transporting the medium.
[0011]
5. The medium control device according to claim 4, wherein the failure information storage unit is configured such that when the transport unit fails to perform the processing of the transport unit with respect to the certain medium holding unit and the transport unit fails, On the other hand, it is characterized in that it stores the fact that it has failed.
[0012]
According to a fifth aspect of the present invention, in the medium control device, the processing of the transport unit with respect to the medium holding unit is a process of taking out the medium held by the medium holding unit.
[0013]
Medium control device according to claim 6, the processing of the conveyance means for said medium holding means, characterized in that the medium in which the conveying means has a process of storing in the medium holding means.
[0014]
Medium control device according to claim 7, wherein the medium holding means, cells storing medium, or, characterized in that it is a drive for recording and reproducing medium.
[0015]
9. The medium control method according to claim 8, further comprising: a plurality of conveyance units for conveying the medium; and a plurality of medium holding units for holding the medium, wherein the failure information storage unit stores the plurality of media when the medium is conveyed. The success or failure of the processing of the transport unit for each holding unit is stored, and the checking unit starts the processing of the transport unit for a certain medium holding unit before the plurality of transport units for the medium holding unit at the time of transporting the medium. The success / failure of the processing up to now is confirmed from the information of the failure information storage means, and the selection means is based on the result confirmed by the confirmation means, and the medium at the time of transporting the medium to the transportation means having no failure information so far. It is characterized in that processing for the holding means is performed.
[0016]
Medium control method according to claim 9, based on the result of the check by said check means, when to the all of the plurality of transport means there is a failure information ever, the selection means is the least failure count The present invention is characterized in that a transporting means performs a process for the certain medium holding means at the time of transporting the medium.
[0017]
The medium control method according to claim 10, wherein, based on the result confirmed by the confirmation means, when there is no failure information for all of the plurality of transport means, or when there is no failure information, the selection means The present invention is characterized in that the transporting means having the shortest distance from the certain medium holding means performs processing on the certain medium holding means at the time of transporting the medium.
[0018]
12. The medium control method according to claim 11, wherein the failure information storage unit is configured such that when the transport unit fails to perform the processing of the transport unit with respect to the certain medium holding unit and the transport unit fails, On the other hand, it is characterized in that it stores the fact that it has failed.
[0019]
According to a twelfth aspect of the present invention, in the medium control method, the processing of the transporting unit with respect to the medium holding unit is a process of removing the medium held by the medium holding unit.
[0020]
A medium control method according to a thirteenth aspect is characterized in that the processing of the transport unit with respect to the medium holding unit is a process of storing the medium held by the transport unit in the medium holding unit.
[0021]
A medium control method according to a fourteenth aspect is characterized in that the medium holding means is a cell for storing a medium or a drive for recording and reproducing the medium.
[0022]
A program according to claim 15, wherein a medium control device including a plurality of transport units for transporting a medium and a plurality of medium holding units for holding a medium starts processing of the transport unit for a certain medium holding unit. Before performing, the confirmation means for confirming from the information of the failure information storage means whether the processing of the plurality of transport means to the medium holding means at the time of the medium transport so far, based on the result confirmed by the confirmation means, is a program for causing ever selection means for the free transport means having failure information to perform processing for the medium holding means when said medium transport as.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the configuration of the embodiment of the present invention will be described in detail.
[0024]
FIG. 1 is a block diagram showing a hardware configuration inside the cartridge library device 1 in a perspective view of the cartridge library device 1 according to the embodiment of the present invention from above.
[0025]
The cartridge library device 1 includes a storage 4, a drive 5, an accessor 7, and a controller 8. The storage 4 is a storage shelf in which a plurality of cells 3 (not shown) are gathered. The cell 3 is one of medium holding means for holding a plurality of cartridges 2 (not shown) by storing or placing them. The drive 5 is one of medium holding means for holding the cartridge 2 by storing or mounting the cartridge 2. Then, the data recorded on the cartridge 2 is reproduced, or the data is recorded on the cartridge 2.
[0026]
The accessor 7 moves the cartridge 2 between the storage 4 and the drive 5. There are multiple accessors.
[0027]
The control unit 8 performs accessor operation control and accessor management.
[0028]
Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. FIG. 2 is a flowchart showing accessor selection control based on accessor failure information for the operation of the embodiment of the present invention. FIG. 3 is a flowchart showing an operation of performing an accessor operation after selecting an accessor and registering failure information of the accessor operation.
[0029]
Referring to FIG. 2, before instructing the accessor 7 to perform processing on the cell 3 or the medium holding unit which is the drive 5, the control unit 8 associates the ID of the accessor performing the processing with the ID of the medium holding unit, The registration information of the failed accessor is checked to see if the combination has failed in the past (s101). If all the accessors 7 have previously failed registrations with the medium holding unit to be processed (YES at s102), the accessor with the shortest moving distance is selected (s104), and the accessor is selected. and it ends the process of control.
[0030]
If there is an unregistered accessor 7 that failed in the past with respect to the medium holding unit to be processed (s102, NO), the unregistered accessor 7 is selected (s103), and the accessor selection control process ends. .
[0031]
Referring to FIG. 3, after the accessor selection control process ends, the control unit 8 to the accessor 7 instructs the processing for the medium holding means (s201). If the process is successful (s102, YES), the process ends. On failure (s102, NO), and registered in association with ID of the failed accessor ID and the medium holding means, the process ends. Subsequently, when there is a process for the medium holding unit for the accessor 7, the process proceeds to the process of FIG. 2 (s101).
[0032]
With the configuration and operation described in this embodiment, a retry operation due to accessor replacement can be prevented beforehand, and the operation time can be reduced and the number of retry operations can be reduced. The reason is that failure information of the accessor 7 for the medium holding unit is referred to before the operation (s101). This is also for registering the failure information of the accessor 7 with respect to the medium holding means (s203).
[0033]
【Example】
Next, the configuration of the first example of the embodiment of the present invention will be described in detail with reference to FIGS.
[0034]
Figure 4 is perspective cartridge library apparatus 1 in the first embodiment from above a block diagram showing a hardware configuration of the cartridge library system 1. FIG. 5 is an enlarged view for explaining the relationship between the accessor 7 and the storage 4 in FIG. Cartridge library system 1 comprises a storage case 4 and the drive 5 and the accessor (L) 7a and accessor (R) 7b and the control unit 8 and rail 9, a.
[0035]
The storage case 4 is a storage shelf in which a plurality of cells 3 for storing a plurality of cartridges 2 are gathered. The drive 5 reproduces data recorded on the cartridge 2 or records data on the cartridge 2.
[0036]
The accessors 7 a and 7 b move the cartridge 2 between the storage 4 and the drive 5. There are a plurality of accessors, two in this embodiment, which are installed on the same rail 9 and duplicated. The left accessor is an accessor (L) 7a, and the right accessor is an accessor (R) 7b. A hand 10 for taking out and storing the cartridge 2 with respect to the cell 3 and the drive 5 is mounted on the accessors 7a and 7b.
[0037]
The control unit 8 is a microprocessor (CPU, MPU) that operates under program control. According to a program stored in a program storage medium (not shown), command execution management and accessor positioning operation from a higher-level device (not shown) are performed. Performs control and accessor management. Examples of the program storage medium include a magnetic disk, a magnetic tape, a semiconductor memory, and an optical disk such as a CD-ROM and a DVD (Digital Versatile Disk).
[0038]
In addition to the program stored in the program storage medium, the control unit 8 also manages command execution from an upper-level device (not shown), controls accessor positioning operation, and executes a program downloaded from a server or the like via a communication medium. Accessor management may be performed.
[0039]
When a program is downloaded via a program storage medium or a communication medium, the program may be operated while being directly read from the download source server, or the program may be stored in the storage unit from the program storage medium or the server and stored in the storage unit. The program may be operated while reading the program.
[0040]
The storage unit needs to be readable and writable, and is generally a RAM (Random Access Memory).
[0041]
FIG. 6 is a functional block diagram of the inside of the control unit 8 showing the functions of the control unit 8. Failure accessor information storage means 81 stores the failure information of the cartridge 2 is taken out operation of the accessor (L) 7a and accessor (R) 7b for each cell 3 and the individual drive 5. Specifically, in association with ID of the ID and the accessor 7 cells 3 or drives 5 failed if it fails to take out operation.
[0042]
Confirmation means 82, when taking out the cartridge from the cell 3 or drive 5, fail accessor ID to the cartridge take-out position the cell ID to confirm whether it is registered. In addition, if it is registered all of the accessor is to check whether they are registered, to check whether unregistered accessor is present.
[0043]
The selection unit 83 selects the unregistered accessor 7 confirmed by the confirmation unit 82. If there is no unregistered accessor 7, the accessor with the shortest moving distance is selected.
[0044]
FIG. 7 shows a failed accessor information management table 811 used in the failed accessor information storage unit 81. In the leftmost column, the ID of each cell 3 storing the cartridge 2 or the ID of the drive 5 is described. Second column from the left is described the ID of the accessor 7 there is a failure in the take-out operation for the cartridge 2 relative to each of the cells 3 or drives 5 previously.
[0045]
Next, the operation of this embodiment will be described in detail with reference to FIGS. FIG. 8 is a flowchart showing accessor selection control based on accessor failure information for the operation of the present embodiment. 9, operation of the embodiment of the present invention performs the accessor operation after accessor selection is a flowchart showing the operation of registering a failure information of the accessor behavior.
[0046]
Referring to FIG. 8, the control unit 8 receives a cartridge movement command from a host device (s1101). The confirming means 82 refers to the failed accessor information of the cell 3 or the drive 5 from which the cartridge has been moved. Specifically, the failure accessor information management table 811 in the failure accessor information storage unit 81 is referred to (s1102). The confirmation unit 82 confirms whether the failed accessor 7 is registered in the failed accessor information management table 811 (s1103). If the failed accessor 7 has been registered (YES in s1103), the checking unit 82 checks whether both the accessor (L) 7a and the accessor (R) 7b are registered (s1104). If both of the accessor 7 is not in the registered state (S1104, NO), the selection means 83 selects an unregistered accessor (S1105). If the failed accessor 7 has not been registered in the failed accessor information management table 811 (s1103, NO) and if both accessors 7 have been registered as failed accessors (s1104, YES), the selection unit 83 determines whether the cartridge has been moved. The accessor 7 having a short moving distance with respect to the cell 3 or the drive 5 is selected (s1106).
[0047]
Subsequently, referring to FIG. 9, the control unit 8 uses the accessor 7 (here, the accessor (R) 7b) selected in s1105 or s1106 in FIG. to move the accessor 7. Then, the operation of taking out the cartridge 2 to the hand 10 from the cell 3 or drive 5 accessor (R) 7b (Fig. 9, s1201). After the removal operation is completed, the confirmation unit 82 determines whether the removal operation of the cartridge 2 has succeeded or failed (s1202). When the removal operation of the cartridge 2 fails (s1202, NO), the selection unit 83 selects an accessor 7 (accessor (L) 7a) different from the accessor 7 used first as a retry operation, and the control unit 8 sets the cartridge (2) The accessor 7 is moved to the source cell 3 or the drive 5. Then, the accessor (R) 7a performs an operation of taking out the cartridge 2 from the cell 3 or the drive 5 with the hand 10 (s1203). After the removal operation is completed, the confirmation means 82 determines whether the removal operation of the cartridge 2 has succeeded or failed (s1204). If the operation of removing the cartridge 2 has failed (s1204, NO), the two failed accessor IDs (accessor (L) 7a and accessor (R) 7b) are registered (s1205), and the cartridge 2 is registered in the host device. (Step 1206), and terminates the process, and waits for the next command from the higher-level device. If the accessor (R) 7a in s1203 succeeds in removing the cartridge 2 from the cell 3 or the drive 5 with the hand 10 (s1204, YES), the failed accessor ID (here, the accessor (R) 7b) is registered. to (s1207). When the operation of removing the cartridge 2 is successful (YES in s1202), after the processing in s1207 is completed, the control unit 8 continues the subsequent movement processing of the cartridge 2 to execute the remaining movement instruction control processing, A normal end report is issued for the command to move the cartridge 2 (s1208). Then, the processing ends, and the system waits for the next command from the host device.
[0048]
The structure and operation described in the first embodiment, it is possible to shorten the durability and operation time by the operation number reduction of the accessor. The reason is as follows. When executing the cartridge movement command, an error condition for an access target cell is confirmed and an accessor is selected. Therefore, if the accessor does not weak the cell exists no to select the accessor having a cell to weak first. Therefore, the possibility of performing the retry operation by replacing the accessor can be reduced. This can prevent a useless operation of moving an accessor having a high probability of failure, thereby preventing an increase in the number of accessor operations due to a retry operation.
[0049]
In this embodiment, the success of the extraction operation the cartridge 2, determines the failure, control is carried out for registering fails accessor information on failure accessor information management table 811. After removing the cartridge 2 and moving the cartridge 2, control is performed to determine success or failure of the storage operation when storing in the cell 3 or the drive 5 in the same manner, and register the failed accessor information in the failed accessor information management table 811. it is also possible to carry out.
[0050]
Next, the configuration of a second example of the embodiment of the present invention will be described. A description of the same configuration as that of the first embodiment will be omitted, and portions having different configurations will be described.
[0051]
Figure 6 shows the function of the control unit 8 is a functional block diagram of the internal control unit 8, the following points are different from those of the first embodiment. The failed accessor information storage unit 81 stores a failure count value of the accessor 7 for the cell 3 or the drive 5 that failed when the take-out operation failed in addition to the function described in the first embodiment.
[0052]
Confirmation means 82, in addition to the functions described in the first embodiment, has a function to determine whether there is a difference between the fail count in two accessors.
[0053]
The selecting means 83 has a function of selecting an accessor having a lower failure count value in addition to the function described in the first embodiment.
[0054]
FIG. 10 shows a failed accessor information management table 812 used in the failed accessor information storage unit 81. In the leftmost column, the ID of each cell 3 storing the cartridge 2 or the ID of the drive 5 is described. The second column from the left indicates "failure", and the third and fourth columns from the left indicate the number of failures of the accessor (L) 7a and the number of failures of the accessor (R) 7b. Then, the described "failure present" prior to the ID of the accessor 7 there is a failure in the relationship in the column of the ID of the individual cells 3 and the drive 5. As an example, "L" which is the ID of the accessor (L) 7a is described in the cell 3 (2). It is also accessor (L) 7a, accessor (R) 7b of each ID to the drive 5 (1), "L", "R" is described. Then, the third and fourth column from the left in each "L", "R", is described there is a failure times. As an example, here, "once" is entered in the column corresponding to "L" in cell 3 (2), and "2 times" and "3 times" are entered in the columns corresponding to "L" and "R" in drive 5 (1). Has been described.
[0055]
Next, the operation of the second embodiment will be described in detail with reference to FIG. FIG. 11 is a flowchart showing accessor selection control based on accessor failure information. Incidentally, a description is omitted perform embodiments of operations accessor operation after accessor selected for the present invention, with respect to the operation of registering a failure information accessor operations are the same as the first embodiment.
[0056]
The control unit 8 that has received the cartridge move command from the host device (s1301) refers to the failed accessor information of the cell 3 of the cartridge move source. Specifically, the failure accessor information management table 812 in the failure accessor information storage unit 81 is referred to (s1302). The confirming unit 82 confirms whether the failed accessor 7 is registered in the failed accessor information management table 812 (s1302). If the failed accessor 7 has been registered (YES in s1303), the checking unit 82 checks whether both the accessor (L) 7a and the accessor (R) 7b are registered (s1304). If both of the accessor 7 is not in the registered state (S1304, NO), the selection means 83 selects an unregistered accessor (S1305). If the failed accessor 7 is not registered in the failed accessor information management table 812 (s1303, NO), or if both accessors 7 are registered (s1304, YES), the accessor (L) 7a or The checking means 82 checks whether there is a difference between the failure count values of the accessor (R) 7b (s1306). If there is a difference between the count values of the accessor (L) 7a or the accessor (R) 7b (YES in s1306), the selection unit 83 selects the accessor 7 with the lower failure count value (s1307). If there is no difference between the count values of the accessor (L) 7a or the accessor (R) 7b (NO in s1306), the selecting unit 83 sets the accessor 7 having a small moving distance to the cell 3 or the drive 5 from which the cartridge is to be moved. select (s1308).
[0057]
With the configuration and operation described in the second embodiment, the possibility of reducing the number of times the accessor is replaced and performing the retry operation is increased. shortening is possible. The reason is failure for both the accessor 7 is because you choosing the accessor 7 failure count is less by if it has been registered.
[0058]
【The invention's effect】
An advantage of the present invention is that it is possible to improve the durability by reducing the number of operation times of the accessor and to shorten the operation time.
[0059]
The reason is as follows. When executing the cartridge movement command, an error condition for an access target cell is confirmed and an accessor is selected. Therefore, if there is a cell that is not good at the cell, there is no need to first select an accessor having the cell that is not good at it. Therefore, it is possible to reduce the need to replace the accessor and execute the retry operation. This can prevent a useless operation of moving an accessor having a high probability of failure, thereby preventing an increase in the number of accessor operations due to a retry operation. In addition, it is possible to shorten the time for performing the cartridge moving operation by receiving the command from the host device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a hardware configuration inside a cartridge library apparatus 1 according to an embodiment of the present invention, as seen through the cartridge library apparatus 1 from above.
FIG. 2 is a flowchart illustrating accessor selection control based on accessor failure information regarding the operation of the embodiment of the present invention;
FIG. 3 is a flowchart showing an operation of performing an accessor operation after selecting an accessor and registering failure information of the accessor operation;
FIG. 4 is a block diagram showing a hardware configuration inside the cartridge library apparatus 1 when the cartridge library apparatus 1 according to the first embodiment is seen through from above.
FIG. 5 is an enlarged view for explaining the relationship between the accessor 7 and the storage 4 in FIG.
FIG. 6 is a functional block diagram of the inside of a control unit 8;
FIG. 7 shows a failed accessor information management table 811 used in the failed accessor information storage unit 81;
FIG. 8 is a flowchart showing accessor selection control based on accessor failure information for the operation of the first embodiment;
FIG. 9 is a flowchart illustrating an operation of performing an accessor operation after selecting an accessor and registering failure information of the accessor operation.
FIG. 10 shows a failed accessor information management table 812 used in the failed accessor information storage unit 81.
FIG. 11 is a flowchart showing accessor selection control based on accessor failure information;
[Explanation of symbols]
1 Cartridge library device
2 cartridges
3 cells
4 Storage
5 Drive
7a Accessor (L)
7b Accessor (R)
8 Control part
9 rails
10 hands
81 Failure accessor information storage means
82 Confirmation means
83 conveyance means selection means
811 Failed accessor information management table
812 Failed accessor information management table

Claims (15)

In a medium control device including a plurality of transport units that transport a medium, and a plurality of medium holding units that hold a medium,
Failure information storage means storing the success or failure of processing of the transport means for each of the plurality of medium holding means at the time of transporting the medium,
Before starting the processing of the transport unit for a certain medium holding unit, a check is made to confirm whether or not the processing of the plurality of transport units for the medium holding unit up to now is successful from the information of the failure information storage unit when the medium is transported. Means,
A medium control device, comprising: a selection unit that causes a conveyance unit having no failure information to perform processing on the medium holding unit when the medium is conveyed, based on a result confirmed by the confirmation unit. Based on the result confirmed by the confirmation means, if there has been failure information for all of the plurality of transportation means so far, the selection means sends the medium to the transportation means with the least number of failures during the medium transportation. 2. The medium control device according to claim 1, wherein a process is performed on the holding unit. Based on the result confirmed by the confirmation means, if there has been failure information for all of the plurality of transportation means, or if there has been no failure information, the selection means transports the shortest distance from the certain medium holding means. 2. The medium control device according to claim 1, wherein the control unit causes the unit to perform processing on the certain medium holding unit when the medium is transported. The failure information storage means stores that, when the transport means fails the processing of the transport means for the certain medium holding means, the transport means has failed for the certain medium holding means in the previous period. 4. The medium control device according to claim 1, wherein: 5. The medium control device according to claim 1, wherein the processing performed by the transport unit with respect to the medium holding unit is a process of removing the medium held by the medium holding unit. 5. The medium control device according to claim 1, wherein the processing of the transport unit with respect to the medium holding unit is a process of storing the medium held by the transport unit in the medium holding unit. 7. The medium control device according to claim 1, wherein the medium holding unit is a cell that stores a medium or a drive that records and reproduces a medium. In a medium control method including a plurality of conveyance units for conveying a medium and a plurality of medium holding units for holding a medium,
Failure information storage means stores success or failure of processing of the transport means for each of the plurality of medium holding means at the time of transporting the medium,
Before the confirmation unit starts processing of the transport unit with respect to a certain medium holding unit, the failure information storage unit determines whether the processing of the plurality of transport units with respect to the medium holding unit at the time of transporting the medium has been successful. Check from
A medium control method, wherein the selecting means causes a conveying means having no failure information to perform processing on the medium holding means at the time of conveying the medium based on a result confirmed by the confirming means. Based on the result confirmed by the confirmation means, if there has been failure information for all of the plurality of transportation means so far, the selection means sends the medium to the transportation means with the least number of failures during the medium transportation. 9. The medium control method according to claim 8, wherein processing for the holding unit is performed. Based on the result confirmed by the confirmation means, if there has been failure information for all of the plurality of transportation means, or if there has been no failure information, the selection means transports the shortest distance from the certain medium holding means. 9. The medium control method according to claim 8, further comprising: causing a unit to perform processing on the certain medium holding unit when the medium is transported. The failure information storage means stores that, when the transport means fails the processing of the transport means for the certain medium holding means, the transport means has failed for the certain medium holding means in the previous period. 11. The medium control method according to claim 8, wherein: 12. The medium control method according to claim 8, wherein the processing performed by the transport unit with respect to the medium holding unit is a process of taking out the medium held by the medium holding unit. 12. The medium control method according to claim 8, wherein the processing of the transport unit with respect to the medium holding unit is a process of storing the medium held by the transport unit in the medium holding unit. 14. The medium control device according to claim 8, wherein the medium holding unit is a cell for storing a medium or a drive for recording and reproducing the medium. A plurality of transport means for transporting the medium, a plurality of medium holding means for holding the medium, a medium control device including a
Before starting the processing of the transport unit for a certain medium holding unit, a check is made to confirm whether or not the processing of the plurality of transport units for the medium holding unit up to now is successful from the information of the failure information storage unit when the medium is transported. means,
Selecting means for causing the transporting means having no failure information to perform processing on the medium holding means at the time of transporting the medium, based on a result confirmed by the confirming means,
Media control program to function as

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