JPH04336622A - Electronic disk sub-system - Google Patents

Abstract

PURPOSE:To provide an electronic disk sub-system which can halve the operating time or eliminate the substantial operating time required for copying the data held in a principal electronic disk device to a vice electronic disk device. CONSTITUTION:The principal and vice electronic disk devices 2 and 3 provided with the copy instructing registers 8 and 9 which are set and reset with the instructions given from an electronic disk controller 4, the instruction changing means 10 which are activated when a copy instructing register 9 of the device 3 is set and recognize the read instructions given from the controller 4 as the write instructions, and the strobe switch means 11 which switch the received strobes to the strobes sent from the device 2 from those sent from the controller 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic disk subsystem, and more particularly to an electronic disk subsystem that simplifies copying operations between two electronic disk devices.

0002

[Prior Art] In a conventional electronic disk subsystem, both primary and secondary electronic disk devices receive a write command from an electronic disk control device, write data using a strobe sent by the electronic disk control device, and write data from the electronic disk control device. When a read command is received, only the original electronic disk device is configured to send the strobe and data over the Imozuru interface, so one electronic disk device may fail and cause the other electronic disk device to fail. While operating as a primary electronic disk device, copy the data held by the primary electronic disk device to the secondary electronic disk device in order to restore the system as a secondary electronic disk device after repairing a fault in one electronic disk device. As a method,
First, the electronic disk control device reads data from the primary electronic disk device using a read command, and then sends a write command to the secondary electronic disk device to write the read data.

0003

[Problems to be Solved by the Invention] In the conventional electronic disk subsystem described above, as a method for copying data held by the primary electronic disk device to the secondary electronic disk device, the electronic disk control device first copies the data held by the primary electronic disk device to the secondary electronic disk device. Data was read from the electronic disk device using a read command, then a write command was sent to the sub-system electronic disk device, and the read data was written, so the operation was performed twice, and the copy Since the operation takes time, there is a problem in that the efficiency of the original electronic disk subsystem function is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic disk subsystem that can reduce the operating time by half or eliminate the actual operating time for copying data held by a primary electronic disk device to a secondary electronic disk device. Our goal is to provide the following.

[0005]

[Means for Solving the Problems] An electronic disk subsystem of the present invention includes two electronic disk devices including a semiconductor storage device for storing data, and an electronic disk control device that controls these two electronic disk devices. connected by an imozuru interface, one of the two electronic disk devices is a primary electronic disk device and the other is a sub-system electronic disk device,
When receiving a write command from the electronic disk control device, data is written to both the primary and secondary electronic disk devices using a strobe sent from the electronic disk control device, and when receiving a read command from the electronic disk control device, only the primary electronic disk device writes data. A strobe and data are sent on the imozuru interface, and when a failure occurs in the primary electronic disk device, the secondary electronic disk device is changed to a new primary electronic disk device, and the primary electronic disk device is changed to a new secondary electronic disk device. In the electronic disk subsystem to be changed to a device, the primary and secondary electronic disk devices set a copy instruction register by a command from the electronic disk control device, and the secondary electronic disk device that set this copy instruction register changes the instruction. By activating the means, a read command from the electronic disk control device is recognized as a write command, and by activating the strobe switching means at the same time, the strobe and data sent from the primary electronic disk device are switched to the above-mentioned interface. The configuration is such that the data is received and stored.

The electronic disk subsystem of the present invention includes two electronic disk devices, each of which includes a semiconductor storage device for storing data, one being a primary electronic disk device and the other being a secondary electronic disk device, and both the primary and secondary electronic disk devices. an imozuru interface that connects an electronic disk control device that controls a system electronic disk device, writes data to both the primary and secondary electronic disk devices using a strobe sent from the electronic disk control device, and controls the electronic disk device. At the time of a read command from the device, only the primary electronic disk device sends a strobe and data over the imozuru interface, and when a failure occurs in the primary electronic disk device, the secondary electronic disk device is transferred to a new primary electronic disk. In an electronic disk subsystem for changing the main electronic disk device to a new sub-system electronic disk device in a device,
The primary and secondary electronic disk devices have a copy instruction register that is set and reset by a command from the electronic disk control device, and a copy instruction register that is activated when the copy instruction register of the secondary electronic disk device is in the set state. A configuration comprising a command changing means for recognizing a read command from an electronic disk control device as a write command, and a strobe switching means for switching a receiving strobe from a strobe sent by the electronic disk control device to a strobe sent by the original electronic disk device. It is.

[0007]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The electronic disk subsystem 1 of the present invention includes:
One of two electronic disk devices each including a semiconductor storage device for storing data is used as a primary electronic disk device 2 and the other is used as a secondary electronic disk device 3, and both the primary and secondary electronic disk devices 2 and 3 are controlled. It is connected to an electronic disk control device 4 by an intermediate interface 5. In addition, the primary and secondary electronic disk devices 2 and 3 write data using the strobe sent by the electronic disk control device 4 as in the past, and only the primary electronic disk device 2 writes data when a read command is issued from the electronic disk control device 4. The strobe and data are sent over the Imozuru interface 5, and when a failure occurs in the primary electronic disk device 2, the secondary electronic disk device 3 is replaced with the new primary electronic disk device 2, and the primary electronic disk device 2 is replaced with the new secondary electronic disk device 2. It is provided with primary and secondary instruction registers 6 and 7 for changing to a system electronic disk device 3. moreover,
The primary and secondary electronic disk devices 2 and 3 have copy instruction registers 8 and 9 that are set and reset by commands from the electronic disk control device 4, and copy instruction register 7 of the secondary electronic disk device 3 that is in the set state. The command change means 10 recognizes a read command from the electronic disk control device 4 that is activated as a write command, and changes the receiving strobe from the strobe sent by the electronic disk control device 4 to the strobe sent by the main electronic disk device 2. The strobe switching means 11 is also provided. The primary electronic disk device 2 is also naturally equipped with an instruction changing means and a strobe switching means, but since the instruction in the primary and secondary instruction register 6 indicates the primary system, they are not activated, so their explanation will be omitted.

Next, the operation will be explained.

When it becomes necessary to copy data held by the primary electronic disk device to the secondary electronic disk device, the electronic disk control device 4 copies the data held by the primary electronic disk device to the secondary electronic disk device 2.
, 3, issues a set command to the copy instruction registers 8 and 9,
Set state (logical value “1”). At this time, the primary and secondary instruction registers 6 and 7 each have a primary instruction value (logical value “0”).
") and the sub-system instruction value (logical value "1"), the command changing means 10 and strobe switching means 11 of the sub-system electronic disk device 3 are activated. In this state, the electronic disk When a read command is issued from the control device 4, the primary electronic disk device 2 uses the Imozuru interface 5.
The strobe and data are sent to the top. On the other hand, when the sub-system electronic disk device 3 receives a write command from the electronic disk control device 4, the command change means 10 recognizes the read command as a write command, and the strobe switching means 11 changes the received strobe to the electronic disk control device 4. Since the strobe to send out is switched to the strobe sent out by the original electronic disk device 2, the strobe and data sent out by the original electronic disk device 2 on the imozuru interface 5 can be received, taken in, and copied.

0012

As described above, the present invention provides an electronic disk device with a copy instruction register that is set and reset by a command from an electronic disk control device, and a copy instruction register of a sub-system electronic disk device. A command changing means that is activated when in the set state and recognizes a read command from the electronic disk control device as a write command, and a receiving strobe is switched from the strobe sent by the electronic disk control device to the strobe sent out by the original electronic disk device. By providing a strobe switching means,
The operating time for copying data held by the primary electronic disk device to the secondary electronic disk device can be halved, or the operation time can be effectively reduced by halving the operation time required to copy data held by the primary electronic disk device to the secondary electronic disk device. This has the effect that it can be reduced to zero.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

[Explanation of symbols]

1 Electronic disk subsystem 2. Original electronic disk device 3. Subsystem electronic disk device 4 Electronic disk control device 5 Imozuru interface 6 Positive instruction register 7 Sub-instruction register 8, 9 Copy instruction register 10 Command change means 11 Strobe switching means

Claims (2)

[Claims] 1. Two electronic disk devices including a semiconductor storage device for storing data and an electronic disk control device that controls these two electronic disk devices are connected by an imozuru interface, and the two electronic disk devices One of them is a primary electronic disk device and the other is a secondary electronic disk device, and when a write command is issued from the electronic disk control device, data is written to both the primary and secondary electronic disk devices using a strobe sent by the electronic disk control device, and the At the time of a read command from the electronic disk control device, only the primary electronic disk device sends a strobe and data over the imozuru interface, and when a failure occurs in the primary electronic disk device, the secondary electronic disk device is sent to a new primary electronic disk device. In an electronic disk subsystem that changes the primary electronic disk device to a new secondary electronic disk device, the primary and secondary electronic disk devices set a copy instruction register in response to a command from the electronic disk control device. , the sub-system electronic disk device which has set this copy instruction register recognizes the read command from the electronic disk control device as a write command by activating the command change means, and at the same time activates the strobe switching means. An electronic disk subsystem characterized in that the strobe and data sent by the original electronic disk device are received by the imozuru interface and the data is stored. 2. Two electronic disk devices each including a semiconductor storage device for storing data, one of which is a primary electronic disk device and the other a secondary electronic disk device, and the primary and secondary electronic disk devices are controlled. and an imozuru interface that connects with the electronic disk control device, writes data to the primary and secondary electronic disk devices using a strobe sent by the electronic disk control device, and writes data to the primary and secondary electronic disk devices using a strobe sent by the electronic disk control device, and when receiving a read command from the electronic disk control device, Only the primary electronic disk device sends a strobe and data over the imozuru interface, and when a failure occurs in the primary electronic disk device, the secondary electronic disk device is transferred to the new primary electronic disk device. In an electronic disk subsystem in which a device is changed to a new sub-system electronic disk device, the primary and secondary electronic disk devices have a copy instruction register that is set and reset by a command from the electronic disk control device, and a copy instruction register that is set and reset by a command from the electronic disk control device. A command changing means that recognizes a read command from the electronic disk control device as a write command, which is activated when the copy instruction register of the disk device is set, and a receiving strobe from the strobe sent by the electronic disk control device. 2. The electronic disk subsystem according to claim 1, further comprising strobe switching means for switching to a strobe output by the system electronic disk device.