JPH03252809A - File compiler - Google Patents

Abstract

PURPOSE:To sequentially compile the data on the shadow side in a short time by providing a memory to a shadow disk device and storing the data on the memory in the shadow disk device when a master disk device is switched to the shadow disk device. CONSTITUTION:When the data are written in a shadow disk device 6, the data same as those on a master disk device 4 are prepared as the sequential data is a RAM 8 which stores sequentially the data on the device 6. When the device 4 is switched to the device 6, the data stored in the RAM 8 are stored in the device 6. Thus the sequential data can be written into the device 6. As a result, the data can be sequentially compiled in the device 6 in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Structure of the Invention] (Industrial Field of Application) The present invention relates to a duplex file organization device equipped with two master/shadow disk devices.

(Prior Art) In recent years, there has been a demand for non-stop operation of system computers (such computers are referred to as non-stop computers). Among the main constituent modules in a computer, disk devices in particular are becoming larger in capacity, and are also becoming more compact and being developed as media that can store large amounts of data.

From the user's perspective, if a failure occurs in this disk device and the internal data files cannot be restored, it will be a huge loss, and the damage will be extremely large.

Under such circumstances, various failure recovery methods for disk devices have been proposed. One of them is a duplex configuration. In this method, two disk devices are distinguished as master and shadow, and when a write instruction to the disk is issued, data is written to both master and shadow in real time, and when a failure occurs on the mask side, the data is immediately transferred to the shadow side. This is a method of switching over and operating on the shadow side.

This method uses both master and shadow file storage locations (
Tracks/sectors) must be identical. This is because if the disk management program is master/shadow and the storage location is different, when switching to the shadow side, the directory structure and file allocation table etc. must be reorganized, and this process takes time, so the file organization location is exactly the same. The most common method is to

However, a drawback of disk devices is that when a new file is created after a file is deleted, the data storage locations are dispersed, resulting in a non-sequential file structure. Processing time increases because interleaved access is required. In the case of a shadow disk device, even if the mask data is accurately inherited, there is no need to inherit the above-mentioned defects in the file structure.

(Problem to be Solved by the Invention) As described above, in the conventional duplex file organization device, if the master/shadow storage locations are different, it takes time to switch from the mask to the shadow. Since the positions had to be the same, there is a problem that if the file configuration of the mask disk device is not sequential, the file configuration of the shadow disk device will also be non-sequential.

The present invention has been made in view of the problems of the prior art, and its purpose is to provide a file organization device that can sequentially organize data on the shadow side with as little time as possible. Our goal is to provide the following.

[Structure of the invention]

(Means for Solving the Problems) A file organization device of the present invention includes two disk devices, a master/shadow device, a memory for sequentially storing data when data is written to the shadow disk device, and a memory for sequential writing. means for generating instructions;
and a controller that writes sequential data in the memory to the shadow disk device upon receiving a sequential write instruction.

(Function) According to the present invention, when data is written to the shadow disk device, a memory for sequentially storing the data is provided, and the same data as the mask disk device is prepared in advance as sequential data, and the data is written from the mask to the mask disk device. At the time of switching to the shadow, data in this memory is stored in the shadow disk device, so that sequential data can be written to the shadow disk device, so data on the shadow side can be written sequentially without taking as much time as possible. can be organized into.

(Example) Examples of the present invention will be described below with reference to the drawings.

The figure is a block diagram of a file organization device according to an embodiment of the present invention.

In the figure, 1 is C, which forms the core of the computer system.
PU, 2 is a system bus, 3 is a mask disk controller, 4 is a mask disk device, 5 is a shadow disk controller, and 6 is a shadow disk device.

When creating a file, the CPUI first issues a mask write command and transfers the data.

The disk controller 3 receives the mask write command and writes the sent data to the mask disk device 4. As a result, a file 7 is formed in this mask disk device 4. Next, the CPUI issues a shadow write command and transfers the same data written to the mask disk device 4. The disk controller 5 receives the shadow write command and writes the sent data to the shadow disk device 6. As a result, the same file 7 as in the mask disk device 4 is formed in this shadow disk device 6.

8 is a RAM file device for sequential writing. This RAM file device 8 sequentially stores data in the RAM when data to the shadow disk device 6 flows on the system bus 2. As a result, a sequential copy file 9 of the file 7 stored in the shadow disk device 6 is formed.

The operator specifies either the normal mode or the sequential write mode for the CPU 1 through an operation means such as a keyboard (not shown). C.P.U.I.
When the normal mode is specified, only the double file organization operation described above is performed, and when the sequential write mode is specified, one file is completed in the RAM file device 8. Sequential write control is performed to write the file 9 of this RAM file device 8 to the shadow disk device 6 each time the file 9 is written.

In this case, the CPU first issues a sequential write control command to the disk controller 5.

Then, the disk controller 5 directly accesses the RAM 8 and transfers the data to the shadow disk device 6.
It is stored in .

As a result, according to this embodiment, the shadow disk device W
The same data as the master disk device 4 is prepared in advance as sequential data in the RAM 8, which stores the data sequentially when data is written to the RA 16. When switching from mask to shadow, this RA
By storing the M8 data in the shadow disk device 6, sequential data can be written to the shadow disk device 6, so that data on the shadow side can be organized sequentially without taking as much time as possible. will be possible.

Here, the reason why we left the sequential write mode and normal mode to the operator's instructions as described above is because switching to sequential image (when master damage occurs) requires reorganization of the disk file management program. Since it takes time, I decided to do it in the form of instructions.

〔Effect of the invention〕

As explained above, according to the present invention, when data is written to the shadow disk device, a memory is provided to sequentially store the data, and the same data as the mask disk device is prepared in advance as sequential data, and the mask When switching from to shadow, the data in this memory is stored in the shadow disk device, making it possible to write sequential data to the shadow disk device, so the data on the shadow side can be written in as little time as possible. Can be organized sequentially.

5... Disk controller, 6... Shadow disk device, 7.9.10... File, 8... RA
M file device.

Claims (1)

[Scope of Claims] Two disk devices, master and shadow, a memory that sequentially stores data when it is written to the shadow disk device, means for generating a sequential write instruction, and the sequential write instruction. A file organization device comprising: a controller that writes sequential data in the memory to the shadow disk device upon receiving an instruction.