JPH0448319A - Data transfer system - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the data processing capability of a main control processor by using only a data transfer device connected by an SCSI bus to perform the transfer control of data and the recording/reading control to a magnetic disk device. CONSTITUTION:At the reception of the external data, a data transfer device 2 receives the data transferred via an X.25 link 1 and then serves an an initiator on an SCSI bus 3 to store the data sent to a magnetic disk device 4, i.e., a target. When a requirement is received from outside for the read-out of the data stored in the device 4, the device 2 receives the requirement. Then the device 2 reads the data out of the device 4 via the bus 3 and then sends them to the outside via the link 1. Thus it is possible to prevent the deterioration of the data processing capability of a main control processor 7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data transfer method, and in particular to data transfer between a magnetic disk device for storing data in a data processing system having a control processor such as a digital exchange, and an external device. Regarding the transfer method.

[Conventional technology]

An example of a conventional data transfer method of this type is shown in FIG.

The data transferred from the outside via X, 25 link] is
data transfer device]-2 and sent to data channel device 3 via IO bus 8. The data channel device 13 transfers data to the magnetic disk interface device 5 via the processor bus 6 under the command of the main control processor 7, and data transfer is completed when the data channel device 13 interrupts the main control processor 7. The data transferred to the magnetic disk interface device 5 is 5c.
The data is stored in the magnetic disk device 4 via the SI bus 3.

When data stored in the magnetic disk device 14 is transferred to the outside, the transfer is performed through a route opposite to that described above.

[Problem to be solved by the invention]

When a large amount of transferred data is stored in or read from a magnetic disk device using the conventional data transfer method described above, - the main control processor issues commands for each transfer block to control the transferred data; This has the disadvantage that the original data processing ability of the main control processor is reduced.

[Means to solve the problem]

The data transfer method of the present invention provides an interface between a processor connected to a processor bus, a magnetic disk device connected to a 5csr bus, the processor bus and the SCSI bus, and controls the processor and the magnetic disk device. , a data processing system including a magnetic disk interface device that relays information, and a data processing system that is equipped with a data transfer device that interfaces with the 5CSI bus and sends and receives data to and from the outside; When writing or reading data to or from a disk device, the data transfer device directly accesses the magnetic disk device via the 5CSI bus.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the data processing system of this embodiment, a data transfer device 2 accommodating an external X, 25 link 1 connects a magnetic disk to a 4 and a magnetic disk interface device 5, and the magnetic disk interface device 5 is further connected to a main control processor 7 via a processor bus 6.

Next, the operation will be explained.

When receiving data from the outside, the data transferred through the X, 25 link 1 is received by the data transfer device 2, and the data transfer device 2 acts as an initiator on the SCSI bus 3 and transfers it to the target magnetic disk device 4. Controls the storage of data that has been sent.

When there is an external request to read data stored in the magnetic disk device 4, the data transfer device 2 receives this request, reads the data from the magnetic disk device 4 via the 5CSI bus 3, and connects the X, 25 link 1. Transfer externally via .

In this way, during data transfer with the outside, the main control processor 7 does not control the data transfer device 2 regarding data transfer.

In the case of data transfer within the data processing system, as in the past, the main control processor 7 controls the magnetic disk interface device via the processor bus 6, and connects the magnetic disk device 4 to the processor bus 6. transfer data between devices.

Furthermore, the protocol for transmitting and receiving data with the outside is not limited to the X and 25 protocols, but may be other protocols.

〔Effect of the invention〕

As explained above, when a large amount of transferred data is recorded on a magnetic disk device or vice versa, the present invention provides control of data transfer, recording on the magnetic disk device,
By controlling reading only by the data transfer device connected to the 5C5I bus, it is possible to prevent a decrease in the data processing ability of the main control processor.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional data transfer system.

Claims (1)

[Claims] A processor connected to a processor bus, a magnetic disk device connected to a SCSI bus, and a magnetic disk that interfaces between the processor bus and the SCSI bus and relays control and information between the processor and the magnetic disk device. A data processing system with an interface device includes a data transfer device that interfaces with the SCSI bus and sends and receives data to and from the outside, and writes data from the outside to the magnetic disk device, A data transfer method characterized in that when reading data, the data transfer device directly accesses the magnetic disk device via the SCSI bus.