JPH0652069A - Backup controller - Google Patents

Abstract

PURPOSE:To provide a backup controller with low power consumption and with correspondent capability by a small power source for backup use. CONSTITUTION:A power unit 1 contains a power source for backup, and is provided with a power failure detection circuit. A CPU 3 makes access memory 2 via a memory control part 4 in a normal operation, but, sets the memory 2 in a standby mode in block unit when receiving a power failure detection signal from the power unit 1. Each memory block.is set in an operation mode one by one, which enables it to make access the memory, and file data in the block is tranferred to a filing device 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup control apparatus for controlling file data saving processing in the case of a power failure in a workstation or the like while supplying a backup power source.

[0002]

2. Description of the Related Art Generally, a workstation is provided with a backup power source such as a battery in case of a power failure. When a power failure occurs, it is switched to the backup power supply, and the file data in the memory is saved to the file device under the supply of the backup power supply.

[0003]

However, since a large file system requires a long time for save processing,
On the other hand, since a file device having a plurality of drives consumes a large amount of power, there is a problem that the backup power source becomes large and the cost becomes high.

The present invention has been made in view of the above problems, and enables backup processing of file data with a small power consumption, thereby making it possible to reduce the size of the backup power supply and reduce the cost. The purpose is to provide a device.

[0005]

According to a first aspect of the present invention, in a backup control device for controlling file data saving processing under power supply during a power failure, a standby mode memory can be set. And a power failure detection means for detecting a power failure and outputting a power failure detection signal, and in response to a signal input from the power failure detection means, sets the memory in a block unit in a standby mode to instruct file data save processing. It is provided with a control means and a memory control means for sequentially accessing the memory blocks targeted for the save processing in response to an instruction from the control means.

According to a second aspect of the present invention, there is provided a backup control device for controlling file data saving processing during power failure under the supply of a backup power source, wherein a file device having a plurality of drives and a power failure are detected. A power failure detecting means for outputting a power failure detecting signal, and a file control means for outputting a power supply control signal in response to a signal input from the power failure detecting means, and setting only a main drive as a target of evacuation processing to enable access. And a power supply control means for stopping the supply of the backup power supply to the drives other than the main drive in response to the power supply control signal from the file control means.

[0007]

In the backup controller according to claim 1,
Memory is set to standby mode in block units by power failure detection, and only the memory block to be saved is set to operation mode and accessible, so power consumption is low and a small backup power supply can be used. .

In the backup control device according to the second aspect of the present invention, only the main drive is set as the target of the evacuation process to be accessible by the power failure detection, and the supply of the backup power to the drives other than the main drive is stopped. Therefore, the power consumption is small, and a small backup power supply can be used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the system configuration of a workstation or the like in which the present invention is implemented.
Memory 2, CPU 3, memory control unit 4, file device 5
Etc. are included.

The power supply device 1 is a voltage supply source for the entire system and has a backup power supply such as a battery in case of a power failure. This power supply device 1 includes a power failure detection circuit, which detects a power failure and outputs a power failure detection signal to C
Output to PU3.

The memory 2 can be set to a standby mode, that is, a standby state in which normal operation can be performed at any time. Holds the data. This memory 2 can be set in a standby mode in block units.

The CPU 3 is the control body of the entire system, and controls access to the memory 2 via the memory control unit 4 having the configuration shown in FIG. A memory control signal is output from the CPU 3, and any memory block BL1 to BLn can be accessed by this memory control signal during normal operation. This memory control signal is set to the standby mode at the time of starting the saving process at the time of power failure.

The file device 5 is a hard disk device or the like, which includes one drive and also has a plurality of drives which will be described later.

The memory control unit 4 comprises a multiplexer 6, a shift register 7, and a flip-flop 8. The multiplexer 6 is supplied with a memory control signal from the CPU 3 and a sequential control signal from the shift register 7.
One of the signals is selectively output to the memory 4 by the output signal of the flip-flop 8.

The shift register 7 makes a memory block corresponding to a step position accessible, and when data in the memory block is transferred to the file device 5, C
A transfer clock is applied from PU3 to perform a step operation. The flip-flop 8 is for switching control of the multiplexer 6, and is set by a file save signal from the CPU 3 to switch the multiplexer 6 to the shift register 7 side. The flip-flop 8 is reset when the power is restored.

FIG. 3 shows step 1 of the flow of operation at the time of power failure.
(Indicated by “ST1” in the figure) to Step 9. In step 1 of the figure, the power failure detection signal from the power supply device 1 is CP.
It is monitored by U3, and when the determination is "YES", the CPU 3 executes the file save processing program, and first sets the memory control signal to the standby mode (step 2). As a result, all the memory blocks of the memory 2 except the file management block are set to the standby mode. Of course, the power supply device 1 is switched to the backup power supply when a power failure occurs.

In the next step 3, the CPU 3 outputs a file save signal to the memory control unit 4 and the flip-flop 8
Is set, and the multiplexer 6 is switched to the shift register 7 side. As a result, the memory block corresponding to the step position of the shift register 7 is set in the operation mode and becomes accessible. In the subsequent step 4, after setting the memory block counter to zero, the process of saving the data of the accessible memory block to the file device 5 is started, and in the next step 5, waits until the transfer of the data of the memory block is completed. To do.

When the transfer is completed, the determination at step 5 becomes "YES", the CPU 3 outputs the transfer clock to the memory control unit 4, increments the shift register 7 by one, and increments the memory block counter by one. Whether or not the saving process is necessary can be known by referring to the contents of the file management block, so that the process can be skipped for data that does not require the saving process.

In the next step 8, the CPU 3 determines whether or not the data transfer for all the memory blocks is completed based on the count value of the memory block counter. If the determination is "NO", the step is performed again. Returning to step 5, the next memory block is accessed and data saving processing is performed. The memory block for which the data transfer is completed is returned to the standby mode.

In this way, the memory blocks are sequentially accessed one by one and the data saving processing is executed. When the processing for all the memory blocks is completed, the determination at step 8 becomes "YES" and the CPU 3
Disconnects the backup power supply in the power supply device 1 and completes all operations (step 9).

FIG. 4 shows the configuration of the file device 5 having a plurality of drives. The file device 5 includes a main drive 9 and a plurality of other drives DR1 to DRn,
A file control unit 10, a data buffer 11, a power switch 12, a power control unit 13 and the like are provided.

The main drive 9 stores a startup program for starting the system operation, and has a backup area for temporarily saving the file data transferred from the memory 2 in case of a power failure. The main drive 9 is directly electrically connected to the power supply device 1.

The other drives DR1 to DRn store individual file data and are electrically connected to the power supply device 1 via the power switch 12. The power switch 12 is normally ON, and the file control unit 10 transfers file data to the drives DR1 to DRn via the data buffer 11. At the time of power failure, the power switch 12 is turned off and the drives DR1 to DRn do not operate,
The file data is stored in the backup area of the main drive 9.

The file control unit 10 controls each drive DR1.
.. to DRn for controlling reading and writing of file data, monitoring a power failure detection signal from the power supply device 1, and controlling the control operation by the power supply control unit 13.

The power supply control unit 13 controls the drives DR1 to DR1.
ON / OFF of Rn buffer gate and power switch 12
In addition to controlling F, it controls the disconnection operation of the backup power supply in the power supply device 1.

FIG. 5 shows the file controller 10 at the time of power failure.
6, and FIG. 6 shows the control procedure of the power supply controller 13. Further, FIG. 7 is a timing chart of the file device 5 at the time of power failure, and the procedure of file data saving processing will be described below with reference to FIGS. 5 to 7.

In step 1 of FIG. 5, the file access is normally performed, and the file controller 10 transfers the file data to each drive DR via the data buffer 11.
1 to DRn directly. In the next step 2, the file control unit 10 monitors the power failure detection signal from the power supply device 1. When the judgment is "YES" due to the occurrence of the power failure, the file control unit 10 proceeds to the next step 1 After the completion of the file transfer, the power supply controller 13 is instructed to stop the power supply to the drives DR1 to DRn.
Note that the power supply device 1 is of course switched to the backup power supply due to the occurrence of a power failure (see FIG. 7 (1)).

When the power supply controller 13 receives the instruction to stop the power supply, the determination in step 10 of FIG. 6 becomes "YES", and in the next step 11, the data buffer 11 is set so that noise is not placed on the data line. Each drive DR1
~ After turning off the buffer gate of DRn (Fig. 7 (3))
In step 12, the power switch 12 is turned off to stop the power supply to the drives DR1 to DRn (see FIG. 7 (4)). After that, the power supply controller 13 waits for an instruction to disconnect the backup power supply from the file controller 10 (step 13).

Returning to FIG. 5, the file control unit 10 checks whether or not there is file data to be saved in the next step 5, after the power supply stop instruction in step 4. When this determination is "YES", the file number of the drive in which the file is originally stored and the designated address block are added to each file data and written in the backup area of the main drive 9 (step 6). In this case, if the backup area is divided for each drive DR1 to DRn, the drive number need not be added.

In this way, the file data to be saved is sequentially transferred to the backup area of the main drive 9, and when the completion of transfer of all files is confirmed after a predetermined time t has passed (see FIG. )), The determination in step 7 is “YES”, and the file control unit 10
Instructs the power supply control unit 13 to disconnect the backup power supply (step 8).

When the power supply control unit 13 receives this instruction, the determination in step 13 of FIG. 6 becomes “YES”, and the power supply control unit 13 disconnects the backup power supply in the power supply device 1 (see FIG. 7A) This completes the save processing of the file data at the time of power failure.

FIG. 8 shows a control procedure of the file controller 10 at the time of power recovery. When the power failure is resolved and the power is restored, the file control unit 10 notifies the CPU 3 of the busy state, and first in step 20, the data in the backup area of the main drive 9 is checked.

At the next step 21, the file controller 1
0 refers to each file data in the backup area by referring to the drive number, and the corresponding drive D
Sequential transfer to R1 to DRn.

When the transfer of all the file data is completed, the file control unit 10 sets the internal ready flag in the next step 22, and notifies the CPU 3 of the ready state.

If the file device 5 is of a built-in type, the CPU 3 may perform all the operations of the file controller 10.

[0036]

According to the first aspect of the present invention, the memory is set to the standby mode on a block-by-block basis upon detection of a power failure so that only the memory blocks to be saved can be sequentially accessed. As a result, only the main drive can be accessed for evacuation processing and the backup power supply to other drives is stopped, so the power consumption is small and the backup power supply can be downsized. The remarkable effect of achieving the object of the invention is achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a workstation or the like in which the present invention is implemented.

FIG. 2 is a block diagram showing a circuit configuration of a memory control unit.

FIG. 3 is a flowchart showing a flow of operations at the time of power failure.

FIG. 4 is a block diagram showing a circuit configuration of a file device.

FIG. 5 is a flowchart showing a control procedure of the file control unit at the time of power failure.

FIG. 6 is a flowchart showing a control procedure of a power supply control unit at the time of power failure.

FIG. 7 is a time chart showing the operation of the file device at the time of a power failure.

FIG. 8 is a flowchart showing a control operation of the file control unit at the time of power recovery.

[Explanation of symbols]

 1 Power Supply Device 2 Memory 3 CPU 4 Memory Control Unit 5 File Device BL1 to BLn Memory Block 9 Main Drive 10 File Control Unit 13 Power Supply Control Unit DR1 to DRn Drive

Claims (2)

[Claims] 1. A backup control device for controlling backup processing of file data in the event of a power failure while supplying a backup power supply, a memory in which a standby mode can be set, and a power failure detection signal is output upon detection of a power failure. A power failure detecting means, a control means for setting the memory in a block mode in a standby mode in response to a signal input from the power failure detecting means, and instructing a file data saving process, and responding to an instruction by the control means. Backup control device comprising memory control means for sequentially accessing memory blocks to be saved. 2. A backup control device for controlling file data saving processing in the event of a power failure while supplying backup power, and a file device having a plurality of drives and a power failure detection signal is output. Power outage detection means, a file control means for outputting a power supply control signal in response to a signal input from the power outage detection means, and setting only a main drive as a target of evacuation processing to enable access, and the file control means Backup control device comprising a power supply control means for stopping the supply of backup power supply to a drive other than the main drive in response to a power supply control signal from the drive.