JP4686211B2 - Command output device and input / output execution time monitoring method - Google Patents

Description

The present invention relates to a method for monitoring time required for input / output between a host system and peripheral devices.

For example, SCSI (Small Computer Sy) is used for input / output between a host system and a detachable peripheral device represented by a disk storage device or a card type semiconductor memory.
a stem interface) bus is used.

In such a SCSI bus system, the selection / timeout / delay monitoring time of the host adapter is set at a minimum of 250 milliseconds to control peripheral devices. If an access command is sent from the host system and there is no response from the peripheral device even after the selection, timeout, and delay monitoring time has elapsed, timeout processing is performed to release the bus.

However, I / O commands include commands that perform special operations, or the commands may not be executed within the selection, timeout, and delay monitoring time depending on the status of peripheral devices. Despite this, there is a problem that a timeout is detected and it is determined that a peripheral device has failed.

In order to deal with such a problem, for example, Japanese Patent Laid-Open No. 2002-358170 discloses an error code from the storage device side to the host system by identifying the same command in response to a retry from the host system when a timeout occurs. A method for requesting the host system to set a long timeout time is described.

However, with such a method, it is necessary to construct a complicated processing system in which a long timeout time is set according to a command from the peripheral device to the host system side, and for example, it cannot be used in a card type semiconductor memory or the like. It was.
JP 2002-358170 A

As described above, in the conventional method, a system for performing a notification for extending the timeout time by an access command from a peripheral device is required.

The present invention is not to build any special system to the peripheral device side, peripherals should be extended the time-out time necessary for command processing, the command output device and hard-failure Ru to recognize whether generated and to provide an input and output execution time monitoring process.

To achieve the above object, the present invention provides a command output device that outputs an access command to a peripheral device, the first output means for outputting a first access command to the peripheral device, and the first A second output means for outputting a second access command to the peripheral device when a response from the peripheral device is not received within a first period after the access command is output, and within the first period When no response is received from the peripheral device, it is detected that the peripheral device is connected to the command output device, and detecting means that detects whether the peripheral device is connected to the command output device. If a response from the peripheral device is not received within a second period longer than the first period after the second access command is output, the first notification is performed. Providing a command output device that includes a knowledge unit.

Further, the present invention provides a output execution time monitoring method in the command output device that outputs the access commands to the peripheral device, and outputting a first access command to the peripheral device, a first access command If but that did not receive a response from the peripheral device in between the first period from the output, and outputting a second access command to said peripheral device from said peripheral device within the first period If the response is not received, it is detected whether or not the peripheral device is connected to the command output device, and after the second access command is output, the first period longer than the first period is output. you and a notifying if the did not receive a response from the peripheral device within the second time period to provide an input and output execution time monitoring process.

In the present invention, the first time-out time is automatically short even without notification from the peripheral device,
When retry processing is performed, the timeout time is lengthened, so that a hardware failure occurs whether the peripheral device should extend the timeout time required for command processing without building any special system on the peripheral device side. Can recognize whether or not

Hereinafter, the best embodiment of the present invention will be described. The present invention is not limited to these embodiments and can be used in various ways.

FIG. 1 is a block diagram of an information apparatus having a host system and peripheral devices having the input / output execution time monitoring system of the present invention.

As shown in FIG. 1, the input / output execution time monitoring system includes an OS 10, an SCI disk driver 20 that exchanges signals with the OS 10, a USB host driver 30 connected thereto, and a USB host connected thereto. It has a controller 40 and a media card reader 50 connected thereto. A media card 60 as a peripheral device can be attached to and detached from the media card reader 50.

In the input / output execution time monitoring system configured as described above, the OS 10 receives an access request from the user to the media card 60 and sends the request to the SCSI disk driver 20. The SCSI disk driver 20 processes the SCSI command and sends a request to the USB host driver 30 as a USB command. The USB command sent to the USB host driver 30 is sent to the USB host controller for interpretation and sent to the media card reader 50.

The media card reader 50 reads data from the media card 69 according to this request and returns a response to the USB host controller 40.

Upon receiving this response, the USB host controller 40 generates an interrupt and generates a USB
Operate the host driver 30, read the response from the media card reader 50,
It is passed to the SCSI disk driver 20. The SCSI disk driver 20 returns this response to O
In S10, the user can read the data on the media card 60 through the OS10.

FIG. 2 is a flowchart illustrating a method for monitoring the input / output execution time in the information apparatus configured as described above.

As shown in FIG. 2, first, the SCSI disk driver 20 that has received an access command from the OS 10 sets a timeout time 1 (100). The timeout time 1 at this time is, for example, about 3 to 5 seconds. Next, the SCSI disk driver 20 sends an access command to the media card 60, which is a peripheral device, via the USB host driver 30, the USB host controller 40, and the media card reader 50 (110). At this time, the media card 60 is inserted into the media card reader 50 and is accessible.

Next, the SCSI disk driver 20 determines whether a response from the media card 60 is obtained via the media card reader 50, the USB host controller 40, and the USB host driver 30 (120). When there is a response from the media card 60 (
Yes), this response is notified to the OS 10 (210). If there is no response from the media card 60 (No), it is determined whether the timeout time 1 has passed (130). If the timeout time 1 has not yet passed, it is determined whether a response from the device has been obtained again. Do. When the timeout time 1 has passed (Yes), a timeout time 2 longer than the timeout time 1 is set (140). The timeout time 2 at this time is, for example, about 30 to 60 seconds.

Next, the SCSI disk driver 20 transmits a command for informing whether the media card 60 is connected to the media card reader 50 via the USB host driver 30 and the USB host controller 40, and whether the media card 60 is connected. Judgment is made (150). If it is determined that the media card 60 has been removed (No), the OS
10 is notified of the command that the media card 60 has been removed (200). If it is determined that the media card 60 has not been removed (Yes), the USB host driver 30 and the USB
An access command is sent to the media card 60 via the host controller 40 and the media card reader 50 (160).

Next, the SCSI disk driver 20 determines whether a response from the media card 60 is obtained via the USB host driver 30, the USB host controller 40, and the media card reader 50 (170). When there is a response from the media card 60 (
Yes), this response is notified to the OS 10 (210). When there is no response from the media card 60 (No), it is determined whether or not the timeout time 2 has passed (180), and if the timeout time 2 has not yet passed, it is determined whether or not a response from the device has been obtained again. Do. When the time-out time 2 has passed (Yes), the OS 10 is notified of a command that has become unavailable due to an abnormality in the device (190).

As described above, in the present invention, even when there is no notification from the peripheral device such as when the peripheral device is suddenly removed, the first time-out time is automatically shortened, and when performing the retry process, the time-out time is increased. It is possible to recognize whether the peripheral device should extend the timeout time required for command processing or whether a hardware failure has occurred without constructing any special system on the peripheral device side.

1 is a block diagram of an information apparatus having a host system and peripheral devices having an input / output execution time monitoring system of the present invention. FIG. It is the flowchart explaining the method of monitoring the input / output execution time of this invention.

Explanation of symbols

10 ... OS
20 ... SCSI disk driver 30 ... USB host driver 40 ... USB host controller 50 ... Media card reader 60 ... Media card

Claims (4)

A command output device that outputs an access command to a peripheral device,
First output means for outputting a first access command to the peripheral device;
Second output means for outputting a second access command to the peripheral device when a response from the peripheral device is not received within a first period after the first access command is output;
Detecting means for detecting whether or not the peripheral device is connected to the command output device when not receiving a response from the peripheral device within the first period;
In the case where it is detected that the peripheral device is connected to the command output device, the peripheral device is within a second period longer than the first period after the second access command is output. A notification means for performing a first notification when no response is received from
A command output device comprising: The command output device according to claim 1, wherein the notification unit performs a second notification when it is detected that the peripheral device is not connected to the command output device. The command output device according to claim 1, wherein the notification unit performs a third notification when receiving a response from the external device to the first or second access command. An input / output execution time monitoring method in a command output device that outputs an access command to a peripheral device,
And outputting a first access command to the peripheral device,
If the first access command is not received a response from the peripheral device in between the first period from the output, and outputting a second access command to said peripheral device,
If no response is received from the peripheral device within the first period, detecting whether the peripheral device is connected to the command output device;
After the second access command is output, it includes a <br/> and be notified if not receiving a response from the peripheral device to a long in the second period than the first time period input and output execution time monitoring method.

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