JPH06243041A - Write controller for storage - Google Patents

Abstract

PURPOSE:To improve the performance of the write processing of data into a storage and to improve data maintenance when power becomes abnormal. CONSTITUTION:A write controller for the storage, which controls the writing of data at a high speed for the storage, is provided with a processor 10, a monitor part 50 monitoring an interface signal between magnetic disk devices 1, a memory 70 holding data which the processor 10 writes into the magnetic disk device 1 until the writing of the magnetic disk device 1 completes, an auxiliary power source 30 holding data in the memory 70 when power abnormality occurs and a control part A60 writing data or the like which is lost due to power abnormality into the magnetic disk device 1. The controller executes the write operation of data at a high speed for the storage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to write control to a storage device, and more particularly to a technique effective when applied to a high-speed write technique in the storage device.

[0002]

2. Description of the Related Art FIG. 1 is a schematic explanatory diagram showing an example of a conventional storage device, and FIG. 2 is a schematic explanatory diagram showing an example of a conventional storage device provided with an auxiliary power source.

For example, as shown in FIG. 1, a plurality of magnetic disk devices 1 and a cache memory 20 associated therewith.
When a write request is issued from the processing device 10 to the magnetic disk device 1, the magnetic disk device 1 is instructed to perform a seek operation, and at the same time, the transferred data is immediately written to the cache memory 20.

Next, when the data writing to the cache memory 20 is completed, the writing completion report is sent to the processing device.

When the seek operation of the magnetic disk device 1 is completed, the data in the cache memory 20 is written in the magnetic disk device 1.

That is, when the writing to the cache memory 20 is completed, a completion report is issued,
Improves performance degradation due to seek time and waiting time for writing to disk.

Further, as shown in FIG. 2, an auxiliary power supply 30 for holding data in the cache memory 20 of FIG. 1 is provided, and in the same processing as the example of FIG. By holding the data in the inside by the auxiliary power supply 30, the loss of data is prevented.

As related arts, Japanese Patent Laid-Open Nos. 3-174623 and 3-217935 can be cited.

[0009]

However, in the prior art as described above, as in the case of FIG. 1, after the completion of the writing to the processing device and before the completion of the data writing to the magnetic disk, a power failure occurs. Alternatively, when data in the cache is lost due to a power failure or the like, it is difficult or impossible for the processing device to recover the data.

Further, in the case of FIG. 2, the auxiliary power supply and its control function must be prepared for each magnetic disk device, so that there is a problem that the cost per magnetic disk device becomes high.

Further, in the case of FIG. 2, even when the auxiliary power supply is used, the time in which the data in the cache memory can be held by the auxiliary power supply is limited, and when the power failure recovery takes time, the time is expired. There is also a problem that data is lost.

Therefore, an object of the present invention is to provide a write control device for a storage device, which can improve the performance of write processing to the storage device and improve the data integrity.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0014]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, the writing control device for a storage device according to the present invention stores the writing process in the storage device by the processing device to end the writing without waiting for the completion of the writing operation of the storage device, thereby shortening the writing time. A writing control device for the device, which includes a monitor unit that monitors an interface signal between the processing device and the storage device, an auxiliary power supply that supplies power for storing data that the processing device writes to the storage device, and a completion of writing of the storage device. Up to a memory for holding the data in the memory when a power failure occurs, and a controller that writes the data in the storage device after the power failure is recovered.

Further, in this case, a storage device for saving the contents of the memory when a power supply abnormality occurs and a control unit for controlling the storage device are provided, power is supplied to the memory and the storage device when the power supply abnormality occurs, and data in the memory is stored. Is saved in the storage device.

[0017]

According to the above-described write control device for a storage device, writing to the storage device is performed at high speed by returning the write processing completion to the processing device before the actual writing to the storage device is completed. be able to.

Further, even when a failure occurs due to a power failure or the like during the writing process to the storage device, the auxiliary power supply is provided so that the data can be held in the memory.

In this case, even when the power supply from the auxiliary power supply is cut off due to a long power failure or the like during writing to the storage device, the data on the memory is written to the storage device in the write control device. , Can prevent the loss of data.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a schematic explanatory view of a writing control device for a storage device according to an embodiment of the present invention, and FIG. 4 is a flow chart showing an operation of the writing control device for a storage device according to an embodiment of the present invention. It is a figure.

First, referring to FIG. 3, the structure of the write control device for the memory device of this embodiment will be described.

The writing control device for writing data to the storage device according to the present embodiment sends a write end command to the processing device before writing to the storage device is completed, when writing data from the processing device to the storage device. In other words, it is a write control device for the storage device that writes the data to the storage device at high speed.

The writing control device for the storage device controls the interface of the bus A90 with the monitor unit 50 for monitoring the signal of the bus A90 connecting the processing device 10 and the plurality of magnetic disk devices 1 distinguished by the device number. A control unit A60, a monitor unit 50, a control unit A60, and a memory 7
It is composed of a bus C80 which is an internal bus for connecting 0, a memory 70 for temporarily storing write data to the magnetic disk device 1, and an auxiliary power supply 30 for holding data of the memory 70 when a power failure occurs. There is.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

First, in step 501, the processing device 10
When writing data to the magnetic disk device 1, after selecting the corresponding magnetic disk device 1 by the bus A 90, the magnetic disk device 1 is written with a “series of commands for writing data, an address to write the data and a length. It is displayed on the bus A90 for the purpose of notifying "."

Next, in step 502, the monitor unit 50
Constantly monitors the bus A90, and when the processing device 10 selects any magnetic disk device, acquires the device number of the magnetic disk device.

Further, in step 503, the monitor unit 5
0 then identifies from the "series of instructions" displayed on the bus A90 that the processing unit 10 will write data, and subsequently acquires the "address and data length" displayed on the bus A90.

Then, in step 504, the monitor unit 5
"Device number, address, data length" acquired by 0
Is transferred to the memory 70 by the bus C80 which is an internal bus, and at the same time, a storage area corresponding to the “data length” is secured in the memory 70.

In step 505, when the magnetic disk device 1 receives the data write, the processing device 10
For the purpose of transferring data to the magnetic disk device 1,
Display data on bus A90.

Therefore, in step 506, the monitor unit 5
0 transfers the data to the area in the memory 70 in which the data on the bus A 90 is secured in advance, and holds the data in the memory 70 until the writing to the magnetic disk device 1 is completed.

Then, in step 507, the processing device 1
0 does not wait for the write completion report from the magnetic disk device 1, and it is considered that the write command is completed when the data transfer to the magnetic disk device 1 is completed.

In step 508, the magnetic disk device 1 sends a write completion report to the controller A60.

Then, in step 509, the control unit A6
When 0 receives the write completion report from the magnetic disk device 1, the corresponding area in the memory 70 is released.

Further, in the above example, after the data transfer from the processing device 10 to the magnetic disk device 1 is completed,
It is assumed that a failure such as a power failure has occurred before the completion of writing on the magnetic disk surface.

In this case, it is assumed that the data writing to the magnetic disk device 1 has failed, and the data in the memory 70 is retained at the time when the magnetic disk device 1 recovers from the failure and when the power supply is abnormal. The memory 70 held by the auxiliary power supply 30 which supplies the power of 1 is examined.

If there is an unreleased area in the memory 70, the data lost due to the power supply abnormality is
According to the "device number, address, data length", the data in the area is written in the corresponding magnetic disk device 1.

Therefore, according to the present embodiment, since the monitor section, the auxiliary power supply, and the control section are provided, the data is held until the writing of the data to the storage device is completed, and the write data is stored in the memory when the power supply is abnormal. The data can be held in the storage device after recovery of the power supply abnormality, the data writing process to the storage device can be performed at high speed, and the data loss can be prevented.

FIG. 5 is a schematic explanatory view showing a write control device (built-in storage device) for a storage device which is an embodiment of the present invention.

The configuration of the writing control device for the storage device of this embodiment is the same as that of the first embodiment, except that the magnetic disk device 100 for saving the contents of the memory when the power supply is abnormal and the control unit B110 for controlling the same are added. It was done.

That is, as shown in FIG. 5, the control unit B110 for controlling the small-capacity magnetic disk device 100 is connected to the bus C80, which is an internal bus, in the same function as in the case of FIG. By supplying the data to the magnetic disk device 100, the memory 70 can be used when a failure such as a power failure occurs.
A function of writing the unreleased area in the magnetic disk device 100 is added.

Next, the operation of this embodiment will be described.

In the case of the present embodiment, it is the same as that of the first embodiment unless the power supply is abnormal.

However, even when the power supply from the auxiliary power supply 30 is cut off due to a long power failure or the like, the memory 7
The magnetic disk device 100 that saves the contents of 0 and the control unit B110 that controls the magnetic disk device 10
Since data is written to 0, loss of data can be prevented.

Therefore, according to the write control device for a storage device of the present embodiment, it is possible to write data in the storage device at a high speed as in the first embodiment, and the data being written in the storage device has an abnormal power supply. As a result, it is possible to prevent the data from being lost, and moreover, it is possible to prevent the data from being lost even when the power is not supplied for a long time.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the storage device of the above-mentioned embodiment has been described as a magnetic disk device.
The present invention is not limited to the above embodiment, but can be widely applied to optical disk devices and the like.

The write control device for the storage device of the above embodiment is also applicable to an information processing device having a plurality of storage devices of different types, for example, a magnetic disk device group and an optical disk device group.

[0048]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

That is, the processing device completes the writing when the data transfer to the storage device is completed, so the overhead due to the writing time to the storage device is improved and the performance of the write operation is improved.

Since the memory holding the write data is held by the auxiliary power supply, the data will not be lost even if a failure such as a power failure occurs.

Further, one for a plurality of magnetic disk devices
It is economical because it requires only two auxiliary power sources.

Further, by adding a storage device for saving the data in the memory in the event of a power failure, the time constraint for power recovery is eliminated and the data integrity is improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram showing an example of a conventional storage device.

FIG. 2 is a schematic explanatory diagram showing an example of a storage device including a conventional auxiliary power supply.

FIG. 3 is a schematic explanatory diagram showing a write control device for a storage device according to an embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of a write control device for a storage device according to an embodiment of the present invention.

FIG. 5 is a schematic explanatory diagram showing a write control device (built-in storage device) for a storage device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic disk device 10 processing device 20 cache memory 30 auxiliary power supply 50 monitor unit 60 control unit A 70 memory 80 bus C 90 bus A 100 magnetic disk device 110 control unit B

Claims (2)

[Claims] 1. A writing control device for a storage device, wherein a writing process from a processing device to a storage device is terminated without waiting for the completion of the writing operation of the storage device to shorten the writing time. A monitor unit that monitors an interface signal between the storage device and the storage device, an auxiliary power supply that supplies power to store data to be written in the storage device by the processing device, and a memory that is held on the memory until the writing of the storage device is completed. And a control unit that retains data in the memory when a power failure occurs and writes the data in the storage apparatus after the power failure is recovered. 2. A storage device for saving the contents of the memory when a power supply abnormality occurs, and a control unit for controlling the storage device, which supplies power to the memory and the storage device when a power supply abnormality occurs, and stores data in the memory. The write control device for a storage device according to claim 1, wherein the storage device is saved in the storage device.