JPH09185465A - Library system, information processing system and control module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform connection to a bus and to reduce processing load on the host side by setting a logic unit number for each recording medium and managing the recording medium based on the logic unit number. SOLUTION: When loading a magneto-optical disk 3a to be stored in a library system 3, corresponding to an instruction from a host computer 2, the logic unit number is applied to that disk and corresponding to the logic unit number applied at the time of loading, the magneto-optical disk 3a is managed by a control module 3f. Namely the host computer 2 can access the magneto-optical disk 3a similarly to a hard disk device. The control module 3f is connected among a drive unit 3c, conveyance control part 3e and SCSI bus 4 and controls the drive unit 3c and conveyance control part 3e corresponding to the command based on the logic unit number from the host computer 2.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a library device, an information processing system, and a control module,
In particular, the present invention relates to a library device that selectively loads a plurality of recording media into a driver to record / reproduce information, an information processing system, and a control module.

The library device records / records information on a recording medium.
A driver for reproduction, a storage rack for storing a plurality of recording media, a transport mechanism for transporting the recording media between the storage rack and the driver,
It is composed of a controller that controls the drive and the transport mechanism. When the host computer accesses the recording medium stored in the library device, if the required recording medium is not loaded in the drive, it is necessary to load the required recording medium from the storage shelf into the driver.

Further, if another recording medium is loaded in the driver, it is necessary to load the recording medium required by the driver after the recording medium loaded in the driver is transported to the transport rack. is there. As described above, the library device requires complicated medium management.

[0004]

2. Description of the Related Art FIG. 17 shows a system configuration diagram of an example of an information processing system. The information processing system 10 is a system connected by a SCSI bus and includes a host computer 1
1 and the SCSI device 12 are connected via a SCSI bus 13.

A case where a hard disk device is connected as the SCSI device 12 in such a system will be described. When the host computer 11 accesses the hard disk device in such a system, the host computer 11 sets the SCSI-ID and the logical unit number.

Further, a case will be described in which a plurality of recording media are stored in the storage shelves as the SCSI device 12 and a library device for carrying the recording media selected by the carrying device to the drive unit and recording / reproducing information is connected. . When the host computer 11 accesses the library device, logical unit numbers are set in the drive unit and the transport device in the conventional library device, and the host computer 11 selects the library device by SCSI-ID and specifies the drive unit by the logical unit number. And the transport device was selected. Further, when the cartridge number CTD # of the recording medium required by the transport device is mounted in the drive unit designated by the host computer, the host computer designates which recording medium is mounted in the designated drive unit and instructs the transport device. Needed to issue a command to do so.

Therefore, the host computer 11 manages the recording medium stored in the library device and the recording medium in which the processing information is recorded, such as identification.

[0008]

However, unlike the hard disk drive or the like, the conventional library device is different from the hard disk device or the like when the host computer manages the cartridge number CTG # for identifying the recording medium, and the host computer Since it is necessary to specify the cartridge number CTG # when accessing the library device from the computer, there is a problem that connection to the SCSI bus is not easy as compared with other devices such as a hard disk device.

Further, a cartridge number is given corresponding to the recording medium, and the host computer designates the recording medium by designating the cartridge number, and designates the drive to be used by designating the logical unit number. Since the host computer manages not only the logical unit number but also the cartridge number CTG # for identifying the recording medium, and the cartridge number CTG # needs to be instructed to the transport device at the time of access, the host computer It was a burden on the side.

The present invention has been made in view of the above points, and provides a library device, an information processing system, and a control module that can easily connect to a bus and reduce the processing load on the host side. The purpose is to do.

[0011]

According to a first aspect of the present invention, there is provided a driver for driving a recording medium, a recording medium storage unit for storing the recording medium, and the driver and the recording medium storage unit. In a library apparatus having a transport mechanism for transporting a recording medium, a logical unit number is set for each recording medium, and the recording medium is managed by the logical unit number.

According to the first aspect, since the data can be managed in the same manner as the hard disk device by setting and managing the logical unit number of the stored recording medium for each recording medium, the host computer side distinguishes it from the hard disk device. Data management can be performed without doing so, and the processing load on the host computer side can be reduced.

According to a second aspect of the present invention, a logical unit number extended to the logical unit number is set.
According to the second aspect, by setting the extended logical unit number as the logical unit number, it is possible to set the logical unit number for many recording media.

According to a third aspect of the present invention, SC is added to the logical unit number.
It is characterized in that the logical unit number set by the SI extension command is set. According to the third aspect, the logical unit number can be connected to the SCSI bus by setting the logical unit number set by the SCSI extension command, and the logical unit number can be set for many recording media by the extension command. .

According to a fourth aspect, SC is added to the logical unit number.
It is characterized in that a logical unit number which can be set by the reserved byte set in the SI command is set. According to the fourth aspect, the logical unit number can be expanded to the range settable by the reserved byte by setting the logical unit number which can be set by the reserved byte set in the SCSI command.

According to a fifth aspect, SC is added to the logical unit number.
It is characterized in that a logical unit number that can be set by the SI vendor unique command is set. According to claim 5, by setting a logical unit number that can be set by the SCSI vendor unique command to the logical unit number, the logical unit number can be expanded to a range that can be set by the SCSI vendor unique command. It can be expanded more than when expanded.

According to a sixth aspect of the present invention, there is provided a control module for obtaining the logical unit number and controlling the transport mechanism according to the logical unit number. According to the sixth aspect, the library device can be easily connected only by adding the control module.

A seventh aspect of the present invention is an information processing system, characterized by comprising a SCSI device connected to the library apparatus according to the first to sixth aspects by a SCSI bus.
According to the seventh aspect, since the SCSI device only needs to set the logical unit number when accessing the library apparatus, the processing load on the SCSI device side can be reduced.

A control module according to claim 8 is provided between a SCSI bus and a library device for recording / reproducing information by moving a recording medium between a storage shelf and a driver, and connecting the SCSI bus. The library device is controlled according to a logical unit number instructed via the recording device, and one of the recording media stored in the library device is selected and recorded / reproduced.

According to the eighth aspect, since the recording medium stored in the library device can be designated by the logical unit number by the control module, it is only necessary to designate the logical unit number when accessing the library device. It is possible to reduce the processing load of the device that accesses the.

[0021]

1 is a block diagram of an information processing system according to an embodiment of the present invention. The information processing system 1 according to the present embodiment has a configuration in which a host computer 2 and a library device 3 are connected via a SCSI bus 4.

The host computer 2 comprises a host computer body 2a and a host adapter 2b, and the host adapter 2b outputs data from the host computer body 2a to the SCSI bus 4. FIG. 2 shows an external view of a library device according to an embodiment of the present invention.

The library device 3 of the present embodiment has a box shape whose outer shape is limited to a height of about ten and several centimeters and has lengths in the lateral direction and the depth direction. An operation panel 31 is provided on the front surface of the apparatus body 30. The operation panel 31 includes a power switch 31a, a key switch 31b,
An eject switch 31c is provided. A tray 32 is provided next to the operation panel 31.

As shown in FIG. 2B, the tray 32 is pulled out from the main body 30 of the apparatus, and three magazine racks 34 for storing the cartridges 33 of the optical disk medium can be mounted therein. The power switch 31a is a switch for turning on / off the power of the apparatus. Also,
The eject switch 31b connects the tray 32 to the apparatus main body 30.
It is a switch for putting in and taking out. When the eject switch 31b is operated in a state where the tray 32 is pulled in the apparatus body 30, the tray 32 is pulled out from the apparatus body 30, and when the tray 32 is operated in a state where the tray 32 is pulled out from the apparatus body 30, the tray 32 is pulled in the apparatus body 30. Be drawn to.

The key switch 31c is a switch for enabling or canceling the function of the eject switch 31b. When the tray 32 is pulled out by the eject switch 31b, first, by inserting a dedicated key into the key switch 31c and turning it, the eject switch 31b is rotated.
Need to be enabled. Normally, the key switch 13c is turned off, and the tray 32 is not pulled out from the apparatus main body 30 even if the eject switch 13b is operated.

An on-tine indicator lamp 35 is provided above the eject switch 31b. The online indicator lamp 35 lights up when the library apparatus 3 is being accessed by the host computer 2, which is a host apparatus. On the right side of the eject switch 31b and the online indicator lamp 35, there are provided indicator lamps 36 such as a power source lamp, an abnormality indicator lamp, an accessor indicator lamp, a hard disk drive indicator lamp, an optical disk indicator lamp and the like, which indicate the state of the device. The state of the library device 3 can be confirmed by looking at the indicator light.

FIG. 3 shows an internal configuration diagram of the library apparatus according to an embodiment of the present invention. Three magazine racks 34 are mounted on the tray 32 of the library apparatus 3, and for example, 12 3.5-inch magneto-optical disk cartridges 33 can be mounted on the magazine rack 34. Therefore, a total of 36 3.5-inch magneto-optical disk cartridges 33 can be stored inside the apparatus body 30 of the library apparatus 3. However, of these, 1
Since a cleaning cartridge is assigned to each sheet, the number of 3.5-inch magneto-optical disk cartridges 33 actually recorded / reproduced is 35.

An accessor 37 for moving the cartridge 33 is movably installed on the left side of the magazine rack 34. The accessor 37 is driven by the gear belt 38 and moves along the guide rail 39 in the arrow A direction. The accessor 37 engages with the cartridge 33 on the magazine rack 34 side, has a pick-up claw for loading and unloading the cartridge 33, and operates as a robot hand.

At the back of the magazine rack 34, for example, two disk drives 40 for recording / reproducing the magneto-optical disk stored in the cartridge 33 are installed. The disk drive 40 has an ejecting / ejecting port for ejecting the cartridge 33 on the accessor 37 side.
The cartridge 33 conveyed by 7 is ejected and ejected from the ejection port and recorded / reproduced.

A control module 41 is provided behind the disk drive 40. The control module 41 processes each cartridge 33 stored in the library apparatus 3 as one logical unit number in response to the access from the host computer 2. Control module 41
A hard disk drive 42 is provided on the left side of the.
The hard disk drive 42 operates as a cache for the disk drive 40.

On the right side of the magazine rack 34, an accessor controller 43 and a power supply unit 44
Is provided. The accessor controller 43 controls the drive of the accessor 37 and the tray 32. The power supply unit 44 also supplies power to the entire device.

Further, a fan unit with a filter 45 is provided on the right side of the power supply unit 44. The filter-equipped fan unit 45 takes in air from the suction port 46 and sends the air through the filter to the inside of the apparatus main body 30 to cool the inside of the apparatus. FIG. 4 shows a block diagram of a library device according to an embodiment of the present invention.

The library device 3 corresponds to the magazine rack 34 and the tray 32 shown in FIGS. 2 and 3, and is a magneto-optical (MO; M) for recording / reproducing information processed by the host computer 2.
2), which corresponds to the disk drive 40 of FIGS. 2 and 3, a storage unit 3b in which a cartridge 3a in which an optical disk is stored is stored, a drive unit 3c for recording / reproducing information to / from the cartridge 3a, and an accessor 37 of FIGS. Corresponding to the magneto-optical disk 3a and the storage shelf 3
transporting mechanism 3 for transporting between b and the drive unit 3c
d, which corresponds to the accessor controller 43 of FIGS.
The transport controller 3e for controlling the transport mechanism 3d, the control module 41 shown in FIGS. 2 and 3 and the control module 3f connected to the SCSI bus 5, and the hard disk drive 3g corresponding to the hard disk drive 42 shown in FIGS. It

The magneto-optical disk 3a stored in the library device 3 has a logical unit number (LUN; Logical Unit Number) according to an instruction from the host computer 2 when it is mounted in the library device 3.
Is added to the magneto-optical disc 3a, and the control module 3f
Are managed according to the logical unit number assigned at the time of mounting. That is, the host computer 2 can access the magneto-optical disk 3a in the same manner as a hard disk device.

The control module 3f is the drive unit 3
c and the transport control unit 3e and the SCSI bus 4, and controls the drive unit 3c and the transport control unit 3e according to a command from the host computer 2 based on the logical unit number. The MPU 3g, the magneto-optical disk. Magneto-optical disk management memory 3h for managing 3a,
It is composed of a SCSI interface circuit 3i for controlling the connection with the SCSI bus 4.

When the magneto-optical disk 3a is mounted on the library device, the MPU 3g is mounted on the magneto-optical disk 3a.
Set the logical unit number in the memory and store it in the magneto-optical disk management memory 3h.
When the logical unit number is instructed via the SI bus 4, the corresponding transport control unit 3e is controlled according to the information stored in the magneto-optical disk management memory 3h.

FIG. 5 shows a data configuration diagram of the magneto-optical disk management memory of one embodiment of the present invention. The magneto-optical disk management memory 3h has a logical unit number LU as shown in FIG.
The cartridge number CTD # of the magneto-optical disk 3a corresponding to each N # is stored.

Further, the transport control section 3e is a control module 3
The transport mechanism 3d is controlled so that the magneto-optical disk 3a with the cartridge number CTD # designated by f is mounted in the drive unit 3c. The transport control unit 3e includes an MPU 3j and a cartridge management memory 3k.

FIG. 6 shows a data configuration diagram of the cartridge management memory of one embodiment of the present invention. In the cartridge management memory 3k, as shown in FIG. 6, storage shelves 3 are provided for each cartridge number CTD # set corresponding to the magneto-optical disk 3a.
Position information indicating which position of the drive unit b or the drive unit 3c is mounted is stored.

Next, the operation at the time of initialization will be described. FIG. 7 shows an operation flowchart at the time of initialization of the conveyance control unit according to the embodiment of the present invention. Transport control unit 3
In step e, the presence or absence of the magneto-optical disk in the apparatus is checked when the initialization operation of the library apparatus 3 is performed (steps S1-1 and S1-2).

In step S1-2, when there is a magneto-optical disk in the apparatus, for example, the transport mechanism 3d is moved to the storage shelf 3b, and each storage position (cell) in which the magneto-optical disk is stored is changed. Whether or not the magneto-optical disk is stored is detected by determining whether or not the transport mechanism 3d can hold the magneto-optical disk, and the preset cartridge number CTD # for each cell is validated, and the control module 3f is notified of a valid cartridge number CTD # (steps S1-3, S1-4, S1-5, S1-6,
S1-7).

FIG. 8 shows an operation flowchart at the time of initialization of the control module of the embodiment of the present invention. When the transport module 3e notifies the control module 3f of a valid cartridge number CTD #, it then validates the logical unit number LUN # set in the magneto-optical disk management memory 3h in correspondence with the cartridge number CTD #. (Steps S2-1, S2-2, S2-3, S2-4).

Next, the operation when the host computer 2 accesses the library device 3 will be described. FIG. 9 shows an operation flowchart of the host computer according to the embodiment of the present invention. When the host computer 2 needs to access the library device 3 in the process of processing information,
Request the bus usage right from the SCSI bus 4 (step S3)
-1, S3-2).

When the host computer 2 acquires the right to use the SCSI bus 4 in step S3-2, a SCSI-ID for identifying the library device 3 on the SCSI bus 4 is output in order to select the library device 3. Then, the logical unit number LUN # to be accessed is notified to the library device 3 (steps S3-4 and S3-).
5).

Next, the host computer 2 outputs a command requesting access to the library device 3 via the SCSI bus 2 (step S3-6). When the host computer 3 waits for the command execution end from the library device 3 and receives the command execution end notification from the library device 2 (step S3-7), it notifies the SCSI bus 4 of the SCSI bus use end (step S3-).
8).

FIG. 10 shows an operation flowchart at the time of access of the control module according to the embodiment of the present invention. In the control module 3f, when the logical unit number LUN # is designated by the host computer 2 in step S3-3 of FIG. 8, the magneto-optical disk 3a corresponding to the logical unit number LUN # designated by the magneto-optical disk management memory 3h.
Of the cartridge number CTD # of the transport controller 3
e (steps S4-1, S4-2, S4-
3).

The control module 3f executes step S4-2.
Then, after supplying the cartridge number CTD # corresponding to the instructed logical unit number LUN # to the transport control unit 3e, it waits for the notification of access permission from the transport control unit 3e (steps S4-4 and S4-5). Control module 3f
When the transport control unit 3e supplies the access permission notification, the transmission control unit 3e transmits the access permission notification to the host computer 2 (steps S4-6 and S4-7).

FIG. 11 is a flowchart showing the operation of the transport control unit at the time of access according to the embodiment of the present invention. Transport control unit 3
e, in step S4-2 of FIG. 10, the control module 3
When the cartridge number CTD # is supplied from f, next, the cartridge management memory 3k is referred to, the position where the magneto-optical disk of the designated cartridge number CTD # is mounted is searched, and the cartridge is mounted in the drive unit 3c. It is determined whether or not (steps S5-1 and S5).
-2).

If the magneto-optical disk having the instructed cartridge number CTD # is mounted in the drive unit 3c in step S5-2, the transport controller 3e notifies the control module 3f of access permission (step S5-).
3). If the magneto-optical disk of the designated cartridge number CTD # is not mounted in the drive unit 3c in step S5-2, the transport control unit 3e refers to the cartridge management memory 3k and refers to the drive unit 3k.
It is determined whether or not another magneto-optical disk is mounted on c, and the transport mechanism 3d is controlled to store the magneto-optical disk mounted on the drive unit 3c in an empty cell in the storage shelf 3b. , The contents of the cartridge number CTD # of the moved magneto-optical disk of the cartridge management memory 3k are updated to the position of the cell of the transported storage shelf 3b (steps S5-4, S5-5, S5-6, S5-).
7).

Next, the transport control section 3e refers to the cartridge management memory 3k, controls the transport mechanism 3d, and moves it to the cell of the storage shelf 3b in which the magneto-optical disk of the designated cartridge number CTD # is stored. After gripping the magneto-optical disc of the designated cartridge number CTD # and mounting it on the drive unit 3c, the control module 3f
Is notified of access permission (step S5-3).

As described above, according to this embodiment, the host computer 2 only needs to select the library device 3 by the SCSI-ID and specify the logical unit number LUN # in which the required data is stored. Device 3
Can be connected to the SCSI bus 4 similarly to the hard disk device, so that the library device can be easily connected to the SCSI bus. Further, the host computer 2 side can manage the medium only by the logical unit number LUN # as in the hard disk device, so that the processing on the host computer side can be reduced.

In this embodiment, the control module 3f is described as being built in the library device 3, but
A configuration in which the control module 3f is separate from the library device 3 is also conceivable. By configuring the control module 3f separately from the library device 3, the library device having the conventional configuration can be connected to the SCSI bus in the same manner as the hard disk device by simply connecting the library device to the SCSI bus via the control module. Therefore, data management on the host computer side is facilitated and the processing on the host computer can be reduced.

Further, the logical unit numbers LUN # that can be normally instructed by the SCSI standard are # 0 to 7. Therefore, the logical unit numbers that can normally be instructed are eight magneto-optical disks of LUNs # 0 to 7 that specify the logical unit numbers. However, it is possible to access a maximum of 65536 magneto-optical disks by designating the logical unit number LUN # by using the SCSI extended message.

FIG. 12 shows the format of a normal SCSI command. If the normal extension message is not used, eight magneto-optical disks can be designated by the 3-bit logical unit number LUN of the second byte. 13 to 1
FIG. 6 shows a diagram for explaining the format of the SCSI extension code and the specifications of the extension message.

FIG. 13 shows the format of the logical unit number designation from the host computer to the library device of the logical unit number when the extended message is used. The extended message format is recognized by setting "01H" in the first byte (0 byte) as shown in Fig. 13 (A), and the extended message length n is set in the second byte (1 byte). The extended message code Y is set in the second byte (2 bytes), and the extended message content X is set in the fourth and subsequent bytes (2 bytes).

As an extended message code, FIG.
The logical unit number can be set by appropriately selecting from (B). For example, as shown in FIG. 14, the message length is set to 03H and the extended message code is set to 80H to be vendor unique, so that the 4th byte and the 5th byte (3 to 4 bytes) can be used to specify the extended LUN. .

As described above, 65536 logical unit numbers can be designated by 2 bytes. Further, as shown in FIG. 15, by designating 28H indicating read extension or 2AH indicating write extension as the operation code in the first byte (0 byte), it is set as the normal reserve of the 7th byte (6 bytes). Bits can be set as logical unit numbers. Therefore, 256 logical unit numbers can be set. However, at this time, the 3-bit logical unit number of the second byte, which indicates the normal logical unit number, is set to a dummy.

Further, as shown in FIG. 16, by designating C8H indicating read or CAH indicating write as the operation code in the first byte (0 byte), the 8 bits of the second byte (1 byte) are assigned to the logical unit number. Can be set as Therefore, 256 logical unit numbers can be set. However, at this time, the 3-bit logical unit number of the second byte, which indicates the normal logical unit number, is set to a dummy.

As described above, the settable logical unit number can be increased by using the extended function of the SCSI command.

[0060]

As described above, according to the first aspect of the present invention, the data can be managed in the same manner as the hard disk device by setting and managing the logical unit number of the stored recording medium for each recording medium. The host computer has features such that data management can be performed without distinction from the hard disk device and the processing load on the host computer can be reduced.

According to the second aspect, there is a feature that the logical unit number can be set for a large number of recording media by setting the extended logical unit number as the logical unit number. According to the third aspect, the logical unit number can be connected to the SCSI bus by setting the logical unit number set by the SCSI extension command, and the logical unit number can be set for many recording media by the extension command. It has features such as

According to claim 4, the logical unit number is S
By setting a logical unit number that can be set by the reserve byte set in the CSI command, the logical unit number can be expanded to a range that can be set by the reserve byte. According to claim 5, by setting a logical unit number that can be set by the SCSI vendor unique command to the logical unit number, the logical unit number can be expanded to a range that can be set by the SCSI vendor unique command, and reserved bytes are used. It has the feature that it can be expanded further than when expanded.

According to the sixth aspect, the library device can be easily connected only by adding the control module. According to the seventh aspect, since the SCSI device only needs to set the logical unit number when accessing the library device, it has a feature that the processing load on the SCSI device side can be reduced.

According to the eighth aspect, since the recording medium stored in the library device can be designated by the logical unit number by the control module, it is only necessary to designate the logical unit number when accessing the library device. It has features such as reducing the processing load on the device that accesses the device.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an external view of a library device according to an embodiment of the present invention.

FIG. 3 is an internal configuration diagram of a library device according to an embodiment of the present invention.

FIG. 4 is a block diagram of a library device according to an embodiment of the present invention.

FIG. 5 is a data configuration diagram of a magneto-optical disk management memory according to an embodiment of the present invention.

FIG. 6 is a data configuration diagram of a cartridge management table according to an embodiment of the present invention.

FIG. 7 is an operation flowchart at the time of initialization of the transport control unit according to the embodiment of the present invention.

FIG. 8 is an operation flowchart at the time of initialization of the control module according to the embodiment of the present invention.

FIG. 9 is an operation flowchart of a host computer according to an embodiment of the present invention.

FIG. 10 is an operation flowchart of the control module according to the embodiment of the present invention.

FIG. 11 is an operation flowchart of the transfer control unit according to the embodiment of the present invention.

FIG. 12 is a diagram for explaining the format of a SCSI command.

FIG. 13 is a diagram for explaining a format of an extended command of a SCSI command.

FIG. 14 is an explanatory diagram of an example of an extended command of a SCSI command.

FIG. 15 is a diagram for explaining another format of the extended command of the SCSI command.

FIG. 16 is a diagram for explaining a format other than the extended command of the SCSI command.

FIG. 17 is a configuration diagram of an information processing system using a SCSI bus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Information processing system 2 Host computer 2a Host computer main body 2b Host adapter 3 Library device 3a Magneto-optical disk 3b Storage shelf 3c Drive unit 3d Transport mechanism 3e Transport control unit 3f Control module 4 SCSI bus

Claims (8)

[Claims] 1. A library device having a driver for driving a recording medium, a recording medium storage unit for storing the recording medium, and a transport mechanism for transporting the recording medium between the driver and the recording medium storage unit. 2. The library device according to claim 1, wherein a logical unit number is set for each recording medium, and the recording medium is managed by the logical unit number. 2. The library device according to claim 1, wherein the logical unit number is an expanded logical unit number. 3. The library device according to claim 1, wherein the logical unit number is a logical unit number set by a SCSI extension command. 4. The library device according to claim 3, wherein the logical unit number is a logical unit number that can be set by a reserve byte set in a SCSI command. 5. The library device according to claim 3, wherein the logical unit number is a logical unit number that can be set by a SCSI vendor unique command. 6. The library apparatus according to claim 1, further comprising a control module that obtains the logical unit number and controls the transport mechanism according to the logical unit number. 7. The information processing system using the library device according to claim 1, further comprising a SCSI device connected to the library device by a SCSI bus. 8. A library device and a SCSI for moving a recording medium between a storage shelf and a driver to record / reproduce information.
A library unit is provided between the recording medium and a bus, and controls the library device according to a logical unit number designated via the SCSI bus, and selects one of the recording media stored in the library device. A control module for recording / reproducing.