JPH05173902A - Small computer system interface information monitor device - Google Patents

Abstract

PURPOSE:To monitor the state of data of SCSI independently of a system to recognize the state of an external storage device. CONSTITUTION:ID of the external storage device to be monitored is set to an ID set switch 4, and an SCSI protocol computer 7 monitors an SCSI bus; and when the pertinent ID is operated, the external storage device having this ID is accessed to record information in a RAM 3, and this information is analyzed by a system controller 1 and is displayed on an information display part 6, and stored monitor data is printed in an information printing part 11 by depression of a print switch 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a host computer and an external storage device using a small computer system interface, and more particularly to a small computer for monitoring the state of the external storage device. The present invention relates to a system interface information monitoring device.

[0002]

2. Description of the Related Art A conventional computer body and an external storage device are connected to a SCSI (Small Computer System).
In the system connected by m Interface, the user operates the host computer to send a command to the external storage device via the small computer system interface to check the state of the external storage device. And check the remaining capacity.

[0003]

In the system of the host computer and the external storage device connected by the above-mentioned conventional small computer system interface, when the state of the external storage device is checked, the user is required to use the current one. There was a problem that the work of the computer was interrupted, the external storage device was operated and examined, and then the work had to be restarted. Further, when a large number of host systems are connected to an external storage device via a small computer system interface, the management of records used is left to the management of the host system side.

[0004]

The small computer system interface information monitoring device of the present invention comprises:
A system that controls the entire system in a device that monitors the external storage device connected to the computer system via a small computer system interface and automatically displays, records, and prints the usage status of the external storage device. A controller, a read-only memory connected to the system controller via an address bus and storing a program for controlling, and a controller connected to the system controller via an address bus for monitoring and control. Random access memory that is temporarily stored when performing, and the ID of the small computer system control to be monitored (Iden
an ID set switch for setting a set number, a display controller for controlling a display signal from the system controller, an information display for displaying information under the control of the display controller, and an external device. The information is passed according to the procedure of S
CSI protocol controller and this SCSI
A buffer that transfers data between the protocol controller and the random access memory
A controller, the system controller, the random access memory, and the buffer,
A controller and a SCSI controller for exchanging information with the SCSI / protocol controller, an information printing controller for controlling information from the system controller and controlling a print signal, and information printing for printing by a print signal of the information printing controller And a print switch for informing the system controller of execution and stop of printing.

[0005]

In the present invention, the status of SCSI data is monitored independently of the system to ascertain the status of the external storage device.

[0006]

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, 1 is a system controller that controls the entire system, and 2 is a read-only memory (a program connected to the system controller 1 via an address bus 13 and storing a control program). ROM), 3 is connected to the system controller 1 via the address bus 13, and is a random access memory (RAM) that is temporarily stored when performing monitoring and control. 4 is a small computer for monitoring.・ ID that sets the system control ID number
A set switch, 5 is a display controller that controls a display signal from the system controller 1, 6 is an information display unit that is controlled by the display controller 5 to display information, and 7 is a fixed procedure with an external device. A SCSI protocol controller that transfers information, a buffer controller 8 that transfers data between the SCSI protocol controller 7 and the random access memory 3, and a system controller 1 and a random access controller 9. Memory 3 and buffer controller 8 and SCSI protocol
A SCSI controller for exchanging information with the controller 7, 10 is an information printing controller for controlling information from the system controller 1 and controlling a print signal, 11 is an information printing unit for printing according to the print signal of the information printing controller 10, and 12 is A print switch that informs the system controller 1 of execution and stop of printing. Reference numeral 14 is a data bus, 15 is a SCSI data bus, and 16 is a SCSI control bus.

FIG. 2 is an explanatory diagram showing an example of execution of a single command without disconnection of SCSI bus timing, which is used for explaining the operation of FIG.

FIG. 3 is an explanatory diagram showing the transition of the bus phase when the arbitration phase is not used, which is used to explain the operation of FIG.

FIG. 4 is a connection diagram of the optical disk device, the SCSI information monitoring device, and the host computer system used for the explanation of the operation of FIG.

FIG. 5 is a block diagram when devices are connected using the SCSI bus, which is used to explain the operation of FIG.

FIG. 6 is an explanatory diagram showing a configuration example of an embodiment of the present invention, in which PC is a personal computer, ODS is an optical disk, HDS.
Indicates a hard disk.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. First, one or more IDs of the external storage device whose usage status is to be monitored are set in the ID set switch 4. System controller 1
Operates according to the instructions in the read-only memory 2,
The SCSI controller 9 is notified of the ID set in the ID set switch 4. This SCSI controller 9
Is the SCSI / Protocol
Control the controller 7. The SCSI protocol controller 7 is a SCSI data bus 15
It also monitors the SCSI control bus 16 to determine if the host computer has accessed external storage. When the SCSI protocol controller 7 senses, the SCSI controller 9 informs the system controller 1.

Next, the system controller 1 controls the SCSI protocol controller 7 via the SCSI controller 9 to directly access the external storage device accessed without using a host computer, and information is accessed. Take it out. The system controller 1 analyzes the retrieved information and displays it on the information display unit 6 via the display controller 5. The buffer controller 8 directly controls the SCSI controller 9 and records the operation result of the SCSI protocol controller 7 in the random access memory 3. The system controller 1 retrieves the information monitored by the SCSI protocol controller 7 from the random access memory 3 without accessing the external storage device. Then, a certain amount of the record accessed from the host computer to the external storage device is saved, and if the user wants to save the result, the system controller 1 stores the data in the random access memory 3 by pressing the print switch 12. -Transfer to the controller 10. The information printing controller 11 prints the transferred data by the information printing controller 10.

Next, when the host computer selects an external storage device and enters the information transfer phase and the processing ends and returns to the bus free state, the small computer system interface information monitoring device is in the bus free state. After confirming, go get information about the accessed target. Also, if there are two external storage devices, the small computer system interface information monitor after the host computer accesses the first external storage device and before accessing the second external storage device. If the device confirms that the bus is free, it reserves the bus and retrieves the information from the target for display. If the bus-free state cannot be confirmed, the information of the first external storage device is displayed for a certain period of time after accessing the second external storage device, and then the information of the second external storage device is displayed. .

[0015]

As described above, according to the present invention, the SCSI
Since the status of the data of is monitored independently of the system and the status of the external storage device is grasped, it is possible to do without special operations such as interrupting the host computer.
You can know the status of the external storage device in real time,
In addition, the status of multiple external storage devices can be known with one small computer system interface information monitoring device, and since the SCSI status is stored in the internal RAM, it is not necessary to access the external storage device each time, so it is fast. There is an effect that can be processed. Further, there is an effect that the state in which the computer uses the external storage device can be displayed / recorded / printed without passing through the host system.
In addition, when a large number of host systems are connected to an external storage device via a small computer system interface, the records used are managed by the host.
Since management is left to the system side, the management becomes complicated. Therefore, according to the present invention, it is possible to easily record all accesses from other systems without going through the host system. Have.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing an example of execution of a single command without disconnection of SCSI bus timing, which is used for explaining the operation of FIG. 1;

FIG. 3 is an arbitration for explaining the operation of FIG.
It is explanatory drawing which shows the transition of a bus phase when a phase is not used.

FIG. 4 is a connection diagram of the optical disk device, the SCSI information monitoring device, and the host computer system used for the operation description of FIG.

5 is a block diagram when devices are connected using the SCSI bus, which is used for explaining the operation of FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing a configuration example of an embodiment of the present invention.

[Explanation of symbols]

 1 System Controller 2 ROM 3 RAM 4 ID Set Switch 5 Display Controller 6 Information Display 7 SCSI / Protocol Controller 8 Buffer Controller 9 SCSI Controller 10 Information Printing Controller 11 Information Printing Controller 12 Printing Switch

Claims (1)

[Claims] 1. An apparatus for automatically displaying / recording / printing a usage state of an external storage device by monitoring an external storage device connected to a computer system through a small computer system interface, And a read-only controller that stores a program for controlling the system controller connected to the system controller via an address bus.
A memory, a random access memory connected to the system controller via an address bus and temporarily stored when monitoring and controlling, and an ID number of a small computer system control to be monitored. An ID set switch to be set, a display controller for controlling a display signal from the system controller, an information display unit for displaying information under the control of the display controller, and information according to a fixed procedure with an external device. SCSI protocol for delivery of
A controller, a buffer controller that transfers data between the SCSI protocol controller and the random access memory, the system controller, the random access memory, the buffer controller, and the SCSI protocol A SCSI controller that exchanges information with the controller, an information print controller that controls information from the system controller and a print signal, an information printing unit that prints according to the print signal of the information print controller, and execution of printing And a print switch for notifying the system controller of stoppage, and a small computer system interface information monitoring device.