JPH0736794A - Scsi interface system - Google Patents

Abstract

PURPOSE:To permit a host computer to correctly recognize the all abnormal states detected by a peripheral information device. CONSTITUTION:The peripheral information device stores error information in plural error information storage area and manages it. When an error is detected in executing operation commands such as recording and reproduction from the host computer, the corresponding error information is recorded at the error end. When a SCSI request sense command is not correctly received from the host computer, it is taken as an error and made ended and then the error information is recorded on an error information storage area. The check condition status is sent to the host computer. The host computer uses the SCSI request sense command to catch and recognize all error information stored in the error information storage area of the peripheral information device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a host computer and peripheral information devices such as a disk storage device and a printer device using a small computer system interface (generally abbreviated as "SCSI"). The present invention relates to a SCSI interface system.

[0002]

2. Description of the Related Art In recent years, a host computer and a peripheral information device such as a disk storage device and a printer device are connected via a SCSI bus to exchange data between the host computer and the peripheral information device. Face system is often used. Note that SCSI is "Small Comput
er System Interface ”.

In such a SCSI interface system, the following processing is generally performed. First, when the peripheral information device detects an abnormality during execution of a SCSI write command that is an information recording command or a SCSI read command that is an information reproducing command from the host computer, the recording or reproducing process of information is immediately performed. Upon completion, the error information indicating the abnormality is stored in an internal memory or the like, and the check condition status is transferred to the host computer as an error end.

On the other hand, when the host computer receives the check condition status from the peripheral information device for the requested instruction, it issues a SCSI request sense command to the peripheral information device to obtain the error information. .

Then, the peripheral information device receives the SCS while processing the SCSI request sense command.
When a SCSI error such as an I / parity error occurs, error information detected during recording or reproduction of information is cleared and new SCSI error information is set.

Therefore, in general, the SCSI request sense command is a SCSI command that can obtain only one error information, and the host computer receives error information detected during recording or reproducing of information in the peripheral information device. I couldn't get it right.

Conventionally, when the peripheral information device of the SCSI interface system normally receives the SCSI request sense command while holding the error information sense data, the held error information is transferred to the host computer. And terminates the command processing,
If a SCSI error occurs while processing the command,
A sense data control method that transfers the check condition status after transferring the error information to the host computer and holds new error information (for example,
JP-A-4-324552).

[0008]

However, the SCSI using the conventional sense data control method as described above is used.
In the interface system, SCSI, request,
When a SCSI error occurs in the sense command processing, the error information cannot always be transferred to the host computer.

For example, when the host computer detects a parity error during transfer of sense data as error information from the peripheral information device, the host computer sends an initiator detected error message to the peripheral information device. If the peripheral information device is requested to retransmit the sense data, but when the retransmitted sense data is received and a parity error is detected again, the host computer sends a re-initiator detected error message to the peripheral information device. To send.

If the host computer detects a parity error even after retransmitting the sense data, the peripheral information device stops transmitting the sense data, transmits a check condition status, and terminates the command processing. I had no choice. Therefore, there is a problem that the host computer cannot correctly recognize all the abnormal states detected by the peripheral information device.

The present invention has been made in view of the above points, and an object thereof is to allow a host computer to correctly recognize all abnormal states detected by a peripheral information device.

[0012]

In order to achieve the above object, the present invention provides a SCSI interface system in which a host computer and peripheral information devices such as a disk storage device and a printer are connected via a SCSI bus. An error information management unit that stores and manages error information including the name of the SCSI command that caused the error, the error name, and the error address on the recording disk in each of the plurality of error information storage areas in the information device,
A means for storing the corresponding error information in the error information storage area of the error information management means when an error is detected during execution of the operation command for recording or reproducing information from the host computer When a SCSI communication error is detected when an instruction to acquire the error information stored in the error information storage area of the error information management means is received from the host computer, the instruction is terminated as an error and an error of the error information management means A means for storing the SCSI error information is provided in the information storage area, and when the command for acquiring the error information in the host computer is terminated as an error, the host information is stored in the plurality of error information storage areas of the error information management means. It is provided with a means for transmitting an instruction to acquire the plurality of error information that has been obtained.

In the peripheral information device, the error information stored in the error information storage area of the error information management means is stored in the SC.
It is preferable to provide means for converting the data for SI transfer and means for transferring the data for SCSI transfer converted by the means to the host computer.

Further, when the error information of the error information management means is normally transferred to the host computer in the peripheral information device, the error information management means deletes the error information from the error information storage area of the error information management means, and the error information management. If the error information of the means is not normally transferred to the host computer, a means for storing the error information generated at that time in another error information storage area of the error information management means may be provided.

[0015]

The SCSI interface system according to the present invention is a SCSI interface system in which an error occurs on the peripheral information device side.
Error information consisting of a command name, an error name, and an error address on the recording disk is stored and managed in each of a plurality of error information storage areas.

When an error is detected during execution of an operation command for recording or reproducing information from the host computer, the operation command is ended in error and the corresponding error information is stored in the error information storage area of the error information management means. When a SCSI communication error is detected when a command to acquire the error information is received from the host computer, the command is terminated as an error and the SCSI error information is stored in the error information storage area of the error information management means. To do.

Further, the host computer, when the instruction to acquire the error information in the peripheral information device is terminated as an error, causes the peripheral information device to store the plurality of error information stored in the plurality of error information storage areas of the error information management means. Send the command to get. Therefore, the host computer can obtain a plurality of pieces of error information that are correctly managed for each command in the peripheral information device.

On the side of the peripheral information device, the error information stored in the error information storage area of the error information management means is stored in the S
Converted to CSI transfer data and converted SCSI
If the transfer data is transferred to the host computer, the host computer can obtain the error information from the peripheral information device by the SCSI transfer data.

Further, when the error information of the error information management means is normally transferred to the host computer on the side of the peripheral information device, the error information is erased from the error information storage area of the error information management means, and the error information management means is erased. If the error information of is not normally transferred to the host computer, the error information generated at that time is stored in another error information storage area of the error information management means. The error information of all the generated errors can be surely obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. 2 to 4 are block diagrams of a SCSI interface system according to an embodiment of the present invention. In each of the configuration examples, a disk recording device or a tape recording device is used as the peripheral information device.

In the SCSI interface system shown in FIG. 2, the host computer 1 is a host adapter 1a.
Connected to the SCSI bus 4 via
A disk recording device 2 and a tape recording device 3 which are peripheral information devices are connected to the bus 4. The host computer 1 has a built-in microcomputer including a CPU, a ROM, and a RAM, and has a function of acquiring error information from the disk recording device 2 or the tape recording device 3.

On the other hand, in the disk recording apparatus 2, a disk drive controller 2a having a microcomputer built-in and a disk 2b are connected via an interface 2c such as an enhoused small device interface (ESDI). It has a function of managing error information and transferring the error information to the host computer 1.

Further, the tape recording device 3 is a tape drive controller 3 incorporating a microcomputer.
a and the tape 3b are connected via an interface 3c such as a 1/4 inch cartridge drive interface (QIC44), and has a function of managing error information and transferring the error information to the host computer 1. I have it.

In the SCSI interface system shown in FIG. 3, a host computer 1 is connected to a SCSI bus 4 via a host adapter 1a, and the SCSI
Seven disk recording devices 21 to 27, which are peripheral information devices, are connected to the bus 4. The host computer 1 contains a microcomputer as described above,
It has an error information acquisition function from the individual disk recording devices 21 to 27.

On the other hand, the disk recording devices 21 to 24 are respectively provided with disk drive controllers 21a to 24a each having a built-in microcomputer, and each of the disk drive controllers 21a to 24a has an ESDI.
7 through each of the interfaces 21c to 24c.
Individual disk groups 21b to 24b are connected, and a logical unit number (LUN), which is an identifier for identifying the unit, is assigned to each of the disk groups 21b to 24b.

The disk recording devices 25 to 27 are respectively provided with disk drive controllers 25a to 27a each having a built-in microcomputer, and each disk drive controller 25a to 27a has an ESDI.
8 via each of the interfaces 25c to 27c.
Individual disk groups 25b to 27b are connected, and a logical unit number (LUN), which is an identifier for identifying the unit, is assigned to each of the disk groups 25b to 27b.

Then, each of the above disk recording devices 21 to 21.
Each of the units 27 has a function of managing error information and a function of transferring the error information to the host computer 1.

In the SCSI interface system shown in FIG. 4, seven host computers 11-17 are connected via SCSI via respective host adapters 11a-17a.
It is connected to the bus 4, and the host computer 11 is connected to a terminal group 5. A disk recording device 2, which is a peripheral information device, is connected to the SCSI bus 4. Each of the host computers 11 to 17 has a built-in microcomputer as described above, and has a function of acquiring error information from the disk recording device 2.

Further, in the disk recording device 2, a disk drive controller 2a having a microcomputer built-in and a disk 2b are connected via an interface 2c such as ESDI, and management of error information and its error information are carried out. Host computer 11-1
It has a function to transfer to 7.

Therefore, each of the disk recording devices 2, 21 to 27 and the tape recording device 3 described above has a SCSI which has caused an error in each of the plurality of error information storage areas.
An error information management means for storing and managing error information consisting of a command name, an error name, and an error address on the recording disk, and an error during execution of an operation command such as recording and reproducing of information from the host computer. When it is detected, the operation command is terminated in error and the corresponding error information is stored in the error information storage area of the error information management means, and the error stored in the error information storage area of the error information management means from the host computer When a SCSI communication error is detected when a command to acquire information is received, the command is terminated as an error, and it corresponds to a unit that stores the SCSI error information in the error information storage area of the error information management unit.

Further, means for converting the error information stored in the error information storage area of the error information management means into SCSI transfer data, means for transferring the converted SCSI transfer data to the host computer, and an error When the error information of the information management means is normally transferred to the host computer, a means for deleting the error information from the error information storage area of the error information management means, and the error information of the error information management means for the normal host computer If the error information is not transferred to the error information management unit, it also corresponds to a unit for storing the error information generated at that time in another error information storage area of the error information management unit.

Then, each of the above-mentioned disks 2b, 21b-
27b and the tape 3b correspond to the error information management means.

On the other hand, each of the above-mentioned host computers 1,
11 to 17 are the disk recording devices 2 and 21 to 2 described above.
7, and when the command for acquiring error information in the tape recording device 3 is terminated as an error, a plurality of error information storage means of error information management means are stored in each of the disk recording devices 2, 21 to 27 and the tape recording device 3 described above. It corresponds to a means for transmitting an instruction to acquire a plurality of error information stored in the area.

Further, each of the above-mentioned host computers 1,
11 to 17 are the disk recording devices 2 and 21 to 2 described above.
7 and the tape recording device 3, the command for acquiring the plurality of error information stored in the plurality of error information storage areas of the error information management means is transmitted, and each of the disk recording devices 2,
It also corresponds to a means for receiving the SCSI transfer data of the error information from 21 to 27 and the tape recording device 3, and a means for converting the received SCSI transfer data into error information.

Next, the above-mentioned disk recording devices 2, 21 ...
The detailed processing according to the present invention in 27 and the tape recording device 3 (hereinafter collectively referred to as "peripheral information device") will be described. The processing is performed between the disk recording device 2 and the tape recording device 3 with the host computer 1, between the disk recording devices 21 to 27 with the host computer 1, and with the disk recording device 2 the host computers 11 to 17. It is carried out between and.

FIG. 5 shows the SCSI / write / peripheral information in the peripheral information device of the SCSI interface system of this embodiment.
It is a flow chart which shows command (SCSI Write Command) processing.

In this process, the peripheral information device sends a write command (Write Com) from the host computer.
data (information) on the disc
Recording processing is performed, it is judged whether or not a disk error or a servo error is detected, and if a disk error or a servo error is not detected, a good status is transferred and this processing ends.

When a disk error or a servo error is detected by judging whether or not a disk error or a servo error is detected, the error information is recorded in the error information storage area and the error information area pointer is set. Then, the check condition status is transferred and this processing is ended.

That is, when the command is received from the host computer, the data (information) recording process is executed on the disk.
When an error or servo error is detected, the error information is recorded in the first error information area of the error information storage area.

After that, after recording the error information in the first error information area, the error information area pointer is set in the second error information area, and the check condition,
The status is transferred to the host computer and the command processing is ended. On the other hand, if no error is detected during data recording, the good status is transferred to the host computer and the command processing is terminated.

FIG. 6 is a diagram showing an example of the format of the error information storage area of the disks 2, 21b to 27b and the tape 3b, and FIG. 7 is an example of the format of the error detailed information stored in the error information storage area. It is a figure.

As shown in FIG. 6, the error information storage area has a plurality of error information storage areas (error information table), and is divided into, for example, 10 error detailed information areas, each of which is divided into respective areas. Stores error information. Therefore, in this case, a maximum of 10 pieces of error detailed information can be managed.

As shown in FIG. 7, each error detail information area is divided into 8 areas from byte 0 to byte 7, and the ID corresponding to the SCSI command name of the instruction that caused the error in byte 0 The operation code,
The byte 1 stores the sense key, and the byte 2 stores the additional sense code.

The additional sense code qualifier is stored in byte 3, and the logical address on the disk where the error has occurred is stored in bytes 4 to 7, respectively. An error logical address (MSB) is stored in byte 4, and an error logical address (LSB) is stored in byte 7.

In this way, the peripheral information device stores error information consisting of the name of the SCSI command that caused the error, the error name, and the error address on the recording disk in each of the plurality of error information storage areas. When an error is detected during execution of an operation command for recording or reproducing information from the host computer, the operation command is terminated in error and the corresponding error information is stored in the error information storage area of the error information management means. Store.

Next, SCSI write command and SC
Check the operation request instruction such as SI, read command, etc.
The processing when the abnormal termination ends depending on the condition status will be described. In this case, the host computer issues a SCSI request sense command to the peripheral information device in order to obtain error information corresponding to the abnormality.

FIG. 1 is a flow chart showing the processing when the peripheral information device receives a SCSI request sense command from the host computer. In this process, the peripheral information device uses SCSI, request, sense,
Judge whether the command was received normally, and create a request sense format if received normally,
It is determined whether or not the transfer of the request sense data has been normally completed, and if the transfer is normally completed, the first error information area is cleared (erased), the good status is transferred, and this processing is ended.

On the other hand, it is judged whether the SCSI request sense command is normally received or not, and whether the transfer of the request sense data is normally ended or not. When the processing is not completed normally, the error information is recorded in the second error information storage area, the error information area pointer is set, the check condition status is transferred, and this processing is ended.

That is, from the host computer to SCSI
・ When the request sense command is received normally,
The error information stored in the first error information area is converted into the request sense data format and transferred to the host computer. Then, when the transfer of the data ends normally, the error information in the first error information area is cleared (erased), and a good signal is sent to the host computer.
The status is transferred and the processing of the instruction is completed.

On the other hand, when the data transfer cannot be executed normally because the initiator detected error message is received from the host computer during the transfer of the data, or when the parity is received while the SCSI request sense command is being received.・ When an error is detected,
The SCSI error information is recorded in the second error information area without clearing the error information in the first error information area,
Set the error information area pointer to the third error information area and check the condition of the host computer.
The status is transferred and the processing of the instruction is completed.

Therefore, in the peripheral information device, when the execution of the command ends abnormally (check condition status), the sense data representing the end state of the command in detail is created, and in the host computer, the check condition status is generated. The request sense data can be retrieved from the peripheral information device by issuing the request sense command when receiving the.

Next, the format of the request sense data will be described. FIG. 8 is a diagram showing an example of a 4-byte length request sense data format, and FIG. 9 is a diagram showing an example of an extended format request sense data format.

As shown in FIG. 8, "Valid", "Error class (0-6)" and "Error code" are stored in the 0 byte of the 4-byte length sense data.
“Vendor Unique (V)” and “Logical Block Address (MSB)” are stored in 1 byte, “Logical Block Address” is stored in 2 bytes, and “Logical Block Address (LSB) is stored in 3 bytes. ) ”Is stored.

The error class and error code indicate the type of error, and the error class is 0.
The error code can be uniquely defined in the range of ˜6. Also, the logical block address is
It shows detailed information such as the address of the block in which the error occurred. Further, Valid indicates that the information in the logical block address field is valid, and Vendor Unique (V) can be uniquely defined.

As shown in FIG. 9, "valid" and "error" are stored in 0 byte of the extended sense data.
Store class (7) "error code (0)"
The byte contains "segment number (Copy, Compar
e, Copy and Verify) ", and 2
“File mark (FM)”, “end of medium (EOM)”, “incorrect length indicator (ILI)”, “reserve (R)”, and “sense key” are stored in the byte.

"Information byte (MSB)" is stored in 3 bytes, "information byte" is stored in 4, 5 bytes, "information byte (MSB)" is stored in 6 bytes, and "information byte (MSB)" is stored in 6 bytes. Information byte (LSB) "and" additional sense data length (n) "are stored in 7 bytes. Then, in the 8th to (n + 7) th bytes, "additional sense data" is written.
To store. The sense key classifies the cause of the generation of the sense data by 0 to F as listed below.

“0”: No Sense (No Sense) “1”: Recovered Error (Recovered E)
error "2": Not Ready (3): Medium Error (Medium Erro)
r) “4”: Hardware error (Hardware E)
rror "5": Illegal R
request)

"6": Unit attention (Uni
t Attention) “7”: Data Protect (Data Protect)
t) “8”: Blank check (Blank Check)
k) "9": (V) "A": Copy Aborted (Copy Abort)
ed)

"B": Aborted command (Abo
rted Command) "C": Equal "D": Volume Overflow (Volume)
Overflow) "E": Miscompare "F": (R)

Further, the information byte indicates detailed information such as a logical block address, the valid indicates that the content of the information byte is valid, and the segment number indicates the copy (C
This indicates the number of the data segment being executed when the respective commands of “opy”, compare (Compare), and copy and verify (Copy and Verify) abnormally end. The data segment is a copy
It is a unit of comparison.

Further, a file mark (FM) indicates that a file mark has been detected, a sequential access / printer device, and an end of medium (EOM) an end of medium has been detected. It is a sequential access / printer device, and the Incorrect Length Indicator (ILI) indicates that a data block length mismatch was detected.

Furthermore, the additional sense data can be arbitrarily defined, and its length is represented by byte 7. However,
Copy (Copy), Compare (Compare), Copy and Verify (Copy and Ver)
ify), search data (Search Data)
Note that each command has a unique definition of the range of bytes 8 to 11.

The peripheral information device may support either one or both of the 4-byte length format sense data and the extended format sense data described above, but the extended format sense data is not available due to the abundance of information. Is preferable.

Thus, when the peripheral information device detects a SCSI communication error when it receives an instruction to acquire the error information from the host computer, it terminates the instruction as an error and the error of the error information management means. The SCSI error information is stored in the information storage area, and the host computer stores the error information management means in the plurality of error information storage areas of the peripheral information device when the instruction to acquire the error information in the peripheral information device ends as an error. And sending an instruction to obtain the plurality of error information.

Then, the peripheral information device sends the error information stored in the error information storage area of the error information management means to the S
When the command for converting into CSI transfer data and acquiring error information is received, the converted SCSI transfer data is transferred to the host computer. Further, the host computer receives the SCSI transfer data of the error information from the peripheral information device, and receives the received SCS.
I Transfer data is converted into error information.

Furthermore, when the error information of the error information management means is normally transferred to the host computer, the peripheral information device erases the error information from the error information storage area of the error information management means, and the error information management means If the error information of 1 is not normally transferred to the host computer, the error information generated at that time is stored in another error information storage area of the error information management means.

Next, the processing of the host computer after the SCSI request sense command becomes a check condition in the peripheral information device will be described. In FIG. 10, the host computer is a peripheral information device and S
It is a flow chart which shows processing after a CSI * request * sense * command became a check condition.

In this processing, it is judged whether or not the request sense command is an error, and if it is not an error, this processing ends. If there is an error, it is judged whether the request / sense / command processing has ended.
Determine whether or not the SI bus has been acquired, and if so, send a read error information command,
It is determined whether or not the error information is normally received, and if it is normally received, error analysis is performed and the process proceeds to the error processing routine.

On the other hand, if the error information is not normally received, the number of command issuances is incremented (added) by 1,
It is judged whether or not the command issuance frequency is a predetermined value X or more, and if it is not the predetermined value X or more, the process returns to the judgment as to whether the SCSI bus is acquired or not, and if it is the predetermined value X or more, the system abnormality processing is performed.

That is, when the host computer receives the check condition status from the peripheral information device, it waits for the command processing of the peripheral information device to end. Next, arbitration is executed until the right to use the SCSI bus is acquired.

Then, after acquiring the SCSI bus, the peripheral information device receives the SCS which is a vendor unique command.
After the I-read error information command is issued and the data containing all the error information is normally received, the error analysis is performed and the process proceeds to the error processing routine.

When all the error information cannot be correctly received due to the SCSI error, the number of times the command is issued is incremented (added) by "1" and the SCSI command is issued again to the peripheral information device to obtain all the error information. Try to receive correctly. However, when the number of times the command is issued reaches a predetermined value "X", the use of the SCSI bus is stopped without issuing the SCSI command.

FIG. 11 is a diagram showing an example of the format of the SCSI read error information command. In this SCSI read error information command, byte 0 is "operation code (E0)" and byte 1 is "logical unit."
Number (LUN), Reserved (Reserved) "
Are stored respectively.

Further, the bytes 2 and 3 are set to "Reserved (Re
stored ”, byte 4 stores“ allocation length (transfer length) ”, and byte 5 stores“ control byte ”. The allocation length is a field for setting the length of data to be received.

Next, from the host computer, SCSI
The processing of the peripheral information device when receiving the read error information command will be described. Figure 1
2, the peripheral information device is SCSI from the host computer.
FIG. 7 is a flowchart showing a process when a read error information command is received.

In this process, it is judged whether or not the command is normally received, and if normally received, the error information is converted into the data for the command, and it is judged whether or not the data is normally received. When it is normally received, the data in the error information storage area is cleared (erased), the good status is transferred, and this processing is ended.

On the other hand, when the command is not normally received by the judgment as to whether the command is normally received or the data is normally received, the SCSI error information at the time of processing the command is displayed. It is recorded in the error information storage area, the error information area pointer is set, and the reception count of the command is incremented (added) by "1".

Then, it is judged whether or not the number of command receptions is equal to or more than the predetermined value X, and if not, the check is performed.
The condition status is transferred and the processing is terminated. If the value is equal to or larger than the predetermined value X, the data in the error information storage area is copied to the disk, the check condition status is transferred, and the processing is terminated.

That is, after receiving the command from the host computer, the peripheral information device converts the data recorded in the error information storage area into the command data and transfers the command data to the host computer. Then, when the transfer of the data to the host computer is normally completed, the error information in all the error information areas is cleared (erased), the good status is transferred to the host computer, and the processing of the instruction is completed.

Further, when the data transfer cannot be executed normally due to the reception of the initiator de- tected error message from the host computer during the transfer of the data concerned, or the parity is received during the reception of the SCSI read error information command. -When an error is detected, the error information in the first and second error information areas is not cleared (erased) and the SCSI error information is set to the third error information area.
In the error information area, the error information area pointer is set in the fourth error information area, the check condition status is transferred to the host computer, and the processing of the instruction is completed.

Further, when the command re-received due to the SCSI error becomes a SCSI error again, it is confirmed how many times the command has been received, and when the number of reception reaches a predetermined value X, error information is displayed. All error information stored in the storage area is copied to the system area on the disk created for the system, and the command processing ends.

FIG. 13 is a diagram showing an example of an error information data format for a SCSI read error information command. The data format in this case is composed of a 4-byte header and 10 pieces of error detailed information area data following the header.

The header has a 0 byte "read error information (ReadError Inf).
"reservation" in 1 byte "reserved (Re
"served)" to 2 bytes and "error number" to 3
"Error information area data length" is stored in each byte, and detailed error information is stored in each of 4 to 83 bytes.

In this way, the peripheral information device stores the error information including the name of the SCSI command that caused the error, the error name, and the error address on the recording disk in each of the plurality of error information storage areas. The host computer sends an error information acquisition command to the peripheral information device and receives the error information of the peripheral information device.

Further, when the peripheral information device detects an error while executing an operation command such as recording or reproducing information from the host computer, the peripheral information device terminates the operation command in error and outputs the corresponding error information to the error information management means. In the error information storage area, the host computer sends an error information acquisition command to the peripheral information device to receive the error information of the peripheral information device.

Further, when the peripheral information device detects a SCSI communication error when receiving the command to acquire the error information from the host computer, the peripheral information device terminates the command as an error and stores it in the error information storage area of the error information management means. SCSI error information is stored in the host computer, and the host computer stores a plurality of error information storage areas of the error information management means in the peripheral information device when the instruction to acquire the error information in the peripheral information device ends as an error. Send the command to get the error information of.

Further, the peripheral information device converts the error information stored in the error information storage area of the error information management means into SCSI transfer data when transferring the error information, and the converted SCSI transfer data is stored in the host computer. Transfer to computer.

Furthermore, when the error information of the error information management means is normally transferred to the host computer, the peripheral information device erases the error information from the error information storage area of the error information management means, and When the error information is not normally transferred to the host computer, the error information generated at that time is stored in another error information storage area of the error information management means.

Next, the effects of the computer system of this embodiment will be listed. (1) The error information storage area is divided into a plurality of error information areas, and each error information is composed of the SCSI command name in which an error has occurred, the error name and the error address on the disk. Error information can be managed correctly for each command.

Also, after detecting an error during execution of an operation command A such as a recording / reproducing command of information from a host computer, a SCSI communication error is detected when a command B for acquiring error information is received from the host computer. When it is detected, the host computer and the peripheral information device support the command C that stores the error information for the commands A and B and collectively obtains the error information, so that the host computer supports all the error information of the peripheral information device. As a result, the host computer can correctly recognize the error of the peripheral information device, and can perform correct error handling.

(2) Since the peripheral information device converts a plurality of error information into SCSI data for transmission to the host computer, all the error information generated before can be notified to the host computer through the SCSI bus.

(3) Since the peripheral information device clears the error information recorded in the error information storage area when the error information is normally transferred to the host computer,
By accumulating extra error information that has occurred in the past, the error information storage area will not run out and the area can be secured. Further, when the error information cannot be normally transferred to the host computer, the error information can be stacked, so that all error information including past errors can be managed.

(4) Since the host computer can convert the SCSI data received from the peripheral information device into error information, it can know the abnormal condition of the device or the abnormal condition of the SCSI bus previously detected by the peripheral information device through the SCSI bus. it can.

[0094]

As described above, according to the SCSI interface system of the present invention, since the host computer can correctly obtain all the error information of the peripheral information device, the peripheral information device always detects the error information. All abnormal states can be recognized correctly.

[Brief description of drawings]

FIG. 1 is a flowchart showing processing when the peripheral information device of FIGS. 2 to 4 receives a SCSI request sense command from a host computer.

FIG. 2 is a configuration diagram of a computer system which is a SCSI interface system according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a computer system which is another example of the SCSI interface system.

FIG. 4 is a configuration diagram of a computer system which is a SCSI interface system of still another example.

5 is a flowchart showing processing of a SCSI write command in the peripheral information device of the SCSI interface system of FIGS.

FIG. 6 is a diagram showing the disks 2, 21b to 27b shown in FIGS. 2 to 4;
3 is a diagram showing an example of a format of an error information storage area of a tape 3b. FIG.

7 is a diagram showing an example of a format of error detailed information stored in an error information storage area of FIG.

FIG. 8 is a diagram showing an example of a 4-byte length request sense data format.

FIG. 9 is a diagram showing an example of an extended request sense data format.

10 is a flow chart showing a process after the host computer shown in FIGS. 2 to 4 becomes a check condition for a SCSI request sense command in the peripheral information device.

FIG. 11 is a diagram showing an example of a format of a SCSI read error information command.

FIG. 12 is a flowchart showing a process when the peripheral information device of FIGS. 2 to 4 receives a SCSI read error information command from a host computer.

FIG. 13 is a diagram showing an example of an error information data format for a SCSI read error information command.

[Explanation of symbols]

1, 11 to 17: Host computer 1a, 11a to 17a: Host adapter 2, 21 to 27: Disk recording device 2a, 21a to 27a: Disk drive controller 2b, 21b to 27b: Disk 2c, 21c to 27c , 3c: Interface 3: Tape recording device 3a: Tape drive controller 3b: Tape 4: SCSI bus 5: Terminal

Claims (3)

[Claims] 1. A SCSI interface system in which a host computer and peripheral information devices such as a disk storage device and a printer are connected via a SCSI bus, wherein the peripheral information device has a plurality of error information storage areas. Error information management means for storing and managing error information consisting of the name of the SCSI command that caused the error, the error name, and the error address on the recording disk, and the operation of recording and reproducing information from the host computer. When an error is detected during the execution of the instruction, the operation instruction is ended in error and means for storing the corresponding error information in the error information storage area of the error information management means; When an instruction to acquire the error information stored in the error information storage area is received When a SCSI communication error is detected, the command is terminated as an error, and means for storing the SCSI error information in the error information storage area of the error information management means is provided, and the host computer acquires the error information. And a means for transmitting a command for acquiring a plurality of error information stored in the plurality of error information storage areas of the error information management means to the peripheral information device when the command to be completed is terminated as an error. SCSI interface system. 2. The SCSI interface system according to claim 1, wherein the peripheral information device includes means for converting the error information stored in the error information storage area of the error information management means into SCSI transfer data. S converted by means
A SCSI interface system comprising means for transferring CSI transfer data to the host computer. 3. The SCSI interface system according to claim 1, wherein when the error information of said error information management means is normally transferred to said peripheral information device to said host computer, said error information is transferred to said error information management means. Means for erasing from the error information storage area, and if the error information of the error information management means is not normally transferred to the host computer, the error information generated at that time is stored in another error information storage area of the error information management means. A SCSI interface system comprising means for storing.