JP3183912B2 - SCSI device self-diagnosis method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a SCSI (Small Comp
SCSI device (target) that executes commands sent from the host computer via uter System Interface)
The self-diagnosis method.

[0002]

2. Description of the Related Art SCSI is an interface S that connects a small computer manufactured by Sugart Corporation in the United States and its peripheral devices.
It was deliberated by the ANSI (American Standards Association) X3T9.2 Working Committee based on ASI (Shugart Associates System Interface) and standardized as ANSI X3.131-1986. Currently, personal computers and their peripheral devices are It is becoming a standard interface to connect. Recently, work has been underway to standardize an extended version of SCSI-2, but a final decision has not been reached at this time. SCS defined by the ANSI
The scope of the I-interface rules is the following five points. (1) Types of interface signals, their definitions, and signal transfer timings. (2) Definition of a protocol, each phase, and the like that define an operation sequence as an interface. (3) Physical interface conditions such as cable specifications and connector specifications, and electrical conditions of the transmission system. (4) A command system for executing various controls and data transfer of peripheral devices, a command format, and a function of each command. (5) A status byte format for notifying the host computer of the execution result of the command, and a structure of sense data for notifying an abnormal state in the process.

The command system in the above item (4) is as follows. First, the SCSI command is 8
Divided into different groups. CDB (Command Descri
pterBlock) is the first byte of the operation code, the upper three bits of which specify the group code,
The lower 5 bits specify the command code (code indicating the type of command) for each group. The length of the CDB is defined as follows for each group. (1) Group 0 ... 6 bytes (2) Group 1 ... 10 bytes (3) Groups 2 to 4 Reserved (4) Group 5 ... 12 Byte (5) Groups 6-7 Vendor Unique (Manufacturer-Specified) The CDBs of the above groups 6-7 are commands that can be defined uniquely for SCSI devices. In each command,
In the logical block address, fixed-length data blocks are continuously arranged on the logical unit.

FIG. 5 is a diagram showing a configuration of a logical block in a hard disk drive. In FIG. 5, a logical block address = 0 is set for a data block of cylinder = 0 and sector = 0, and the logical block address is increased by 1 each time the data block is incremented by one in the order of sector, track, and cylinder.
One. The logical block address is excellent in that the initiator (host computer) accesses the data by designating the logical block address of the first data block and the number of processing blocks, so that there is no need to be aware of the physical structure. . Therefore, by using the logical block addressing, when devices having different numbers of cylinders, tracks, sectors, and the like are connected to each other, it is possible to operate the same software.

FIG. 6 is a diagram showing a general example of a SCSI system configuration. As a logical unit, FIG.
As shown in FIG. 2, a physical device such as a hard disk is often connected, but a logical unit number (LUN: Lo
gical Unit Number) may be assigned to a physical device or a virtual device. Normal SCS
In I, eight logical units of LUN = 0 to 7 can be connected on the SCSI bus, and a maximum of 2048 logical units can be connected by using an extension message. In the SCSI interface, when a command from the initiator ends normally, the target returns a good status to the initiator. On the other hand, if the command terminates abnormally, chec
k condition Returns status and creates error information called sense data. When the check condition status is returned from the target for the issued command, the initiator issues the request status command to receive the sense data created by the target. You can know what happened.

Among commands in the SCSI interface, a command for performing self-diagnosis of a target and a logical unit connected to the target, Send Diagnos
The tic command is specified. This command performs self-diagnosis of the target and the logical unit connected to the target, and returns a good status if the self-diagnosis can be executed normally.
Returns status, but does not provide detailed information on self-diagnosis results. To get more information, the initiator must
e Diagnostic Results command must be issued.
As a matter of course, before issuing the Receive Diagnostic Results command, it is necessary to issue a Send Diagnostic command to perform self-diagnosis. And
Receive without executing Send Diagnostic command
If a Diagnostic Results command is issued, an error occurs and the target checks the
It is common to return the ndition status.

FIG. 7 shows the CDB of the Send Diagnostic command.
FIG. 3 is a diagram showing an example of the configuration of FIG. In FIG. 7, Seltst (S
elf Test) is a bit for selecting whether to execute a predetermined (default) self-diagnosis or a self-diagnosis indicated by the Parameter List. DevOfL (Device Off Line)
Is a bit for selecting whether or not to permit diagnosis affecting other drives of the same target. UntOfL (U
nit Off Line) is a bit for selecting whether or not to permit an operation affecting access to the user medium.
The Parameter List Length indicates the transfer length of the parameter list transferred for diagnosis using parameters (SelTst = 0).

[0008] By the way, recent devices are becoming more intelligent, and it is general to perform a predetermined self-diagnosis at the time of initialization of the device itself, such as power-on. In addition, in the initialization operation such as turning on the power of the initiator itself, the initiator performs a self-diagnosis of each target to check the status of the target connected to the SCSI bus and the logical unit and a predetermined self-diagnosis of the logical unit.
Execute the nd Diagnostic command to
It is common to issue an ive Diagnostic Results command.

[0009]

When a device which performs a predetermined self-diagnosis at the time of initialization of a device such as power-on by itself is connected to an initiator by a SCSI interface as a target, the target is once automatically initialized at the time of initialization. If the initiator issues a Receive Diagnostic Results command without issuing a Send Diagnostic command even though the specified self-diagnosis is being executed, an error is returned and the initiator returns a Send Diagnostic command. In a device that takes a long time to perform a self-diagnosis operation, such as a device in which a predetermined self-diagnosis operation is performed and a self-diagnosis operation involves movement of a mechanism, there is a disadvantage that command processing time is wasted.

SUMMARY OF THE INVENTION The present invention has been made to solve such a drawback. The purpose of the present invention is to significantly reduce the processing time of a self-diagnosis command at the time of initialization even in a device that requires a long time for a self-diagnosis operation. It is an object of the present invention to provide a SCSI device self-diagnosis method which can be shortened.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide an SCS.
S for executing a command from the host computer via I
In the self-diagnosis method of the CSI device, a predetermined self-diagnosis is executed at the time of initialization of the SCSI device, a result thereof is stored, and a receive diagnostic command is received without receiving a send diagnostic command after the initialization. This is achieved by a SCSI device self-diagnosis method characterized by returning the stored predetermined self-diagnosis result to a host computer when receiving a stick result command.

Another object of the present invention is to provide a self-diagnosis system for a SCSI device that executes a command from a host computer via SCSI, to execute a predetermined self-diagnosis at the time of initialization of the SCSI device, and to store the result. After the unit attention state is cleared, a good status is sent to the host computer without performing the prescribed self-diagnosis operation for the first received send diagnostic command requesting the prescribed self-diagnosis. This is achieved by a self-diagnosis method of the SCSI device, which is characterized by returning.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the configuration of the SCSI system according to the SCSI device self-diagnosis method of the present invention will be described. FIG. 3 is a block diagram showing an example of the SCSI system, and 5 is a SCSI controller as a target. The SCSI controller 5 includes a SCSI protocol circuit (SPC) 6 for performing sequence control of SCSI signals based on the SCSI standard, an MPU 8 which is a control device for controlling the SCSI controller 5 according to a program stored in a ROM 7, various types of sense data, and the like. And a RAM 9 used for storing the data. The SCSI controller 5 is connected to a logical unit 10 such as an information recording / reproducing device. In the figure, reference numeral 13 denotes a host adapter.

Next, an embodiment of a self-diagnosis method for a SCSI device according to the present invention will be described with reference to a flowchart shown in FIG. In FIG. 1, first, in step 100, the SCS
When the power of the I controller 5 is turned on, the SCSI controller 5 executes step 101 as part of the initialization processing.
And performs a predetermined self-diagnosis of itself and the connected logical unit 10, and stores the detailed information of the result in the RAM 9 in step 102. The content of the predetermined self-diagnosis is specific to each SCSI controller and logical unit, and therefore will not be described here. Next, the SCSI controller 5 waits for the first command from the host computer 12 in step 103. S immediately after the target power is turned on
Since the unit attention state is defined by the CSI interface standard, when the first command is received in step 103, sense data indicating the unit attention is set in the RAM 9 in step 104 and the channel is set.
The eck condition status is returned to the host computer 12 and the command ends. In the SCSI standard, even when the unit is in the attention state, the ink air (inqu
Although there is a rule that the iry) command is to be executed, it is assumed here that the command is a general command that is not executed in the unit attention state.

Next, at step 105, the next command is waited for. When the command is received in step 105, the unit attention state is cleared and the command is executed. That is, in Step 106, Receive Diagnostic Results
Check if it is a command and receive Diagnostic R
If it is an esults command, the detailed information of the predetermined self-diagnosis result at the time of power-on stored in the RAM 9 is transferred to the host computer 12 in step 107, the command is terminated, and in step 105, the next command is waited for. In this case, as is generally done, after power is turned on, Send D
Receive Diag without receiving iagnostic command
When the nostic results command is received, the detailed information of the predetermined self-diagnosis result at the time of power-on stored in the RAM 9 is not transferred to the host computer 12 as in step 107, but the check condition status May be returned to end the command.

On the other hand, in step 106, Receive Diagnost
If it is not an icResults command, Sen
d Check if it is a Diagnostic command, and
If it is an agnostic command, SCS
Self-diagnosis according to the instruction of the Send Diagnostic command received by the I-controller 5 and the logic unit 10 (may be a predetermined self-diagnosis or a self-diagnosis based on parameters indicated by a parameter list)
Is executed, the detailed information of the result is stored in the RAM 9, and the next command is awaited at step 105. At step 108
If not a Send Diagnostic command, step 111
Executes the processing according to the function of each command in step 10
At 5, wait for the next command. Thereafter, the processing from step 105 is repeated according to each command.

FIG. 2 is an explanatory diagram showing an example of a self-diagnosis result (Result List) transferred to the host computer 12 by a Receive Diagnostic Results command. FIG.
, The Result List Length of byte 0 indicates the number of bytes (2 in this case) of the diagnostic result following byte 1 and subsequent bytes.
Byte 1 contains detailed information of the diagnosis result of the SCSI controller 5 itself, and Byte 2 a connected logical unit (in this case, the logical unit number is unit 0).
The detailed information of the diagnosis result is shown, for example, as a code or the like in which the state of each function corresponds to each bit.

Here, as described above, when the initiator executes a predetermined self-diagnosis to the target and requests a detailed result, the initiator issues commands in the order of a Send Diagnostic command and a Receive Diagnostic Results command. Is common. In this case, in this embodiment, if the Receive Diagnostic Results command is received without receiving the Send Diagnostic command after the power is turned on, the target already executes a predetermined self-diagnosis when the power is turned on, and stores the result. Check co
Rather than returning the ndition status and terminating the command, the stored self-diagnosis result is returned, which is useful without performing unnecessary processing and unnecessarily increasing the processing time of the command. .

Next, another embodiment of the present invention will be described with reference to a flowchart shown in FIG. Note that this embodiment is the same as the embodiment of FIG. 1 from step 100 to step 106, and a description thereof will be omitted. FIG.
In step 106, Receive Diagnostic Resul
If it is not a ts command, the Send Diagn
ostic command, and check Send Diagnosti
If the command is a c command, after the unit attention state is cleared in step 112, it is checked whether the command is the first Send Diagnostic command requesting a predetermined self-diagnosis. In the case of the Send Diagnostic command requesting the first predetermined self-diagnosis in step 112, the good status is returned without performing the self-diagnosis operation in step 113. In step 112, the first Send Diagnostic
If not a command, or even the first Send Diagnostic command, a request other than the prescribed self-diagnosis Send D
In the case of the iagnostic command, the SCS
Received by the I controller 5 itself and the logical unit 10
A self-diagnosis (may be a predetermined self-diagnosis or a self-diagnosis based on a parameter indicated by a parameter list) is executed according to the instruction of the Send Diagnostic command, and detailed information of the result is stored in the RAM 9. Wait for the next command. Send at step 108
If it is not a Diagnostic command, the process according to the function of each command is executed in step 111, and the next command is waited in step 105. Thereafter, the processing from step 105 is repeated according to each command. FIG. 2 shows an example of the self-diagnosis result transferred to the host computer 12 of the present embodiment, similarly to the above-described embodiment.

In the present embodiment, in the case of the Send Diagnostic command requesting the first predetermined self-diagnosis after the unit attention state is cleared after the power is turned on, the target already executes the predetermined self-diagnosis when the power is turned on. Therefore, not performing the predetermined self-diagnosis operation in response to the Send Diagnostic command is useful for performing unnecessary processing and preventing the command processing time from being unnecessarily increased.

In the above embodiment, the case where the SCSI device is initialized and the case where the power is turned on is described as an example. However, the present invention is not limited to this.
The present invention can be applied to a case where the SCSI device is initialized, such as when an eset message is received or a reset condition occurs.

[0022]

As described above, according to the present invention, a predetermined self-diagnosis is executed at the time of initialization of a device such as power-on, the result is stored, and a Receive Diagnostic command is received after initialization without receiving a Send Diagnostic command. When the Diagnostic Results command is received, the target performs the predetermined self-diagnosis automatically at the time of initialization because the self-diagnosis method returns the stored predetermined self-diagnosis result at the time of initialization. Despite the initiator, Send Dia
ReceiveDiagnos without issuing gnostic command
If the tic Results command is issued, an error is returned, and the self-diagnosis operation takes a long time, such as a device that involves mechanical movement in the self-diagnosis operation without having to perform the predetermined self-diagnosis operation again by the Send Diagnostic command from the initiator. Even with the device, there is an effect that the processing time of the command is not wasted and the processing time of the self-diagnosis command at the time of initialization can be greatly reduced.

After the unit attention state is cleared, the first received self-diagnosis request for a predetermined self-diagnosis
For the nd Diagnostic command, by returning the good status without performing the predetermined self-diagnosis operation, there is no needless operation to obtain the same result as the result already memorized. Even if the self-diagnosis operation takes a long time, such as an apparatus that involves mechanical movement, the command processing time is not wasted, and the processing time of the self-diagnosis command at initialization is greatly reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an embodiment of a self-diagnosis method for a SCSI device according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a self-diagnosis result transferred to a host computer by a Receive Diagnostic Results command.

FIG. 3 is a block diagram showing an example of a SCSI system according to the present invention.

FIG. 4 is a flowchart showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a logical block in the hard disk device.

FIG. 6 is a block diagram showing a configuration of a general SCSI system.

FIG. 7 is an explanatory diagram showing a configuration example of a CDB of a Send Diagnostic command.

[Explanation of symbols]

 Reference Signs List 5 SCSI controller 6 SCSI protocol circuit (SPC) 7 ROM 8 MPU 9 RAM 10 Logical unit 12 Host computer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 13/00-13/14 330 G06F 3/06-3/08 G06F 11/22-11/26 310 JICST File (JOIS)

Claims (3)

(57) [Claims] In a self-diagnosis method for a SCSI device that executes a command from a host computer via a small computer system interface (hereinafter abbreviated as SCSI), a predetermined self-diagnosis is performed when the SCSI device is initialized, If the result is stored and the receive diagnostic result command is received without receiving the send diagnostic command after initialization, the stored predetermined self-diagnosis result is stored in the host. A self-diagnosis method for a SCSI device, which is returned to a computer. 2. A self-diagnosis method for a SCSI device which executes a command of a host computer sent via SCSI, executes a predetermined self-diagnosis at the time of initialization of the SCSI device, stores a result thereof, and stores a unit attention state. After the is cleared, the first received send diagnostic command requesting the predetermined self-diagnosis is performed without performing the predetermined self-diagnosis operation.
A self-diagnosis method for a SCSI device, which returns a status to a host computer. 3. When the receive diagnostic command is received without receiving the send diagnostic command after the initialization of the SCSI device, the stored self-diagnosis result is stored. 3. The method according to claim 2, wherein the data is returned to the host computer.
Self-diagnosis method of CSI device.