JPH0424820A - Filing system device - Google Patents

Abstract

PURPOSE:To attain many independent connections between a filing controller and a filing device in order to decrease the number of signal lines and to improve the working efficiency of a filing system device by providing plural channels between the filing controller and the filing device and performing the transfer of data by using an idle channel. CONSTITUTION:The reference is given to a channel application table 5-1 and a filing device application table 5-2 in response to an access requirement given to a certain filing controller 3 from a host 1. When it is decided that a channel and a relevant filing device 9 are idle, the connection is secured to the device 9 via a MODEM part 4 of a file controller 3, the idle channel, and a MODEM part 8. Then the data are transferred. Thus, many independent connections are attained between the controller 3 and the device 9. Simultaneously, the number of signal lines is decreased and the working efficiency is improved for a filing system device.

Description

[Detailed Description of the Invention] [Summary] Regarding a file system device configured to perform interconnection between a file control device and a file device, a plurality of channels are provided between the file control device and the file device, and an empty The purpose of this method is to use channels to transfer data, provide a large number of independent connections between the file control device and the file device, reduce the number of signal lines, and increase efficiency. A channel usage table to manage, a file device usage table to manage file device availability, and a modulation/demodulation section are provided on the file control device side, and a modulation/demodulation section is provided on the file device side, so that the host can respond to a certain file control device. In response to an access request, when it is determined that the channel is empty and the corresponding file device is empty by referring to the channel usage table and file device usage table, the modulation/demodulation unit of the file control device, the empty channel, and the modulation/demodulation The device is configured to connect with the corresponding file device via the section and perform data transfer.

[Industrial application field]

The present invention relates to a file system device configured to interconnect a file system i device and a file device. 2. Description of the Related Art As the file capacity and reliability of computer systems have increased in recent years, file system devices such as disk devices have become larger in scale. When the scale of a file device is increased, the number of file control devices and file devices connected to the system increases, and the number of signal lines between them also inevitably increases. In addition, the high-fidelity conversion system is multipathed so that even if an error occurs in one of the devices, it can be connected from another route, which increases the number of signal lines, so it is necessary to reduce the number of signal lines. is desired.

[Problems to be solved by conventional technology and inventions] Conventionally,
A file control device and a file device in a file system device are interconnected by parallel signal lines based on logical signals.

By converting these parallel signals into serial signals, the number of signal lines can be reduced. However, in a configuration in which a large number of file control devices and file devices are connected simultaneously and independently (multipath configuration), for example, a multipath configuration with two paths in Figure 6, each file control device and file device Because it has multiple signal paths, a very large number of signal lines are required, and the file control device and file device that connect to these signal lines require ICs for driver D and receiver R, and many expensive connectors. There was a problem.

The present invention provides a plurality of channels between a file control device and a file device, uses empty channels to transfer data, and provides a large number of independent connections between the file control device and the file device. The purpose is to reduce the number of signal lines and increase efficiency.

[Means to solve problems]

Means for solving the problem will be explained with reference to FIG.

In FIG. 1, a channel usage table 5-1 is a table for managing availability of a plurality of channels due to multiplexed signals.

The file device usage table 5-2 is a table for managing the vacancy of the file device 9.

The file control device 3 controls the file device 9.

The modulation/demodulation section 4 is provided on the side of the file control device 1F3 and modulates and demodulates data.

The file device 9 is a device such as a magnetic disk device that stores a large amount of data.

The modulation/demodulation unit 8 is provided on the side of the file device 9 and modulates and demodulates data.

[Effect]

As shown in FIG. 1, in response to an access request from a host 1 to a certain file control bag W3, the present invention refers to a channel use table 5-1 and a file device use table 5-2 to determine whether a channel is empty. When the corresponding file device 9 is found to be empty, connection is made between the corresponding file device 9 via the modulation/demodulation unit 4 of the file control device 3, the empty channel, and the modulation/demodulation unit 8, and data transfer, etc. I try to do this.

Therefore, by providing a plurality of channels between the file control bag W3 and the file device 9 and using empty channels to transfer data, etc., a large number of independent In addition to providing connections, it is possible to reduce the number of signal lines and improve efficiency.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be explained in detail using FIGS. 1 to 4.

In FIG. 1, a host 1 consists of host+11 to host (nl), accesses a file device group 7 under the control of a file control device group 2, retrieves data, stores data, and performs various operations. A host computer that performs processing.

The file control device group 2 includes a file control value W3, a modulation/demodulation section 4, a channel assignment section 5, etc.
It controls the file device group 7.

The file control device 3 is composed of file control devices 3-1 to 3-n, and controls the file device group 7.

The modulation/demodulation section 4 is composed of modulation/demodulation sections 4-1 to 4-n, and modulates data in order to transfer data to/from a file device using the assigned channel.
It is used for demodulating.

The channel allocation unit 5 allocates channels to file control values W3-1 to W3-n in response to connection requests, and refers to the channel use table 5-1 to determine if there is an empty channel and if there is a file device. When the corresponding file device 9 is empty by referring to the usage table 5-2, the empty channel is assigned to the file control device 3.

The multiplexed signal data transfer space 6 is a space where modulation/demodulation is performed between the modulation/demodulation section 4 of the file control bag W3 and the modulation/demodulation section 8 of the file device 9, and data transfer is performed, for example, by frequency division, It is a time-divided space.

The file device group 7 includes a modulator/demodulator 8 and a file device W.
9, etc.

The file device fi9 is composed of file devices W9-1 to 9-m, and stores a large amount of data.

FIG. 2 shows a system configuration diagram of essential parts of the present invention.

FIG. 2(A) shows a block diagram of the file control device 3 and modulation/demodulation section 4 shown in FIG. Here, the D/A converter 10-1 converts the empty channel number notified by the digital signal from the file control device 3 into an analog signal (=channel selection signal).

The carrier wave oscillator 10-2 is for transmitting a carrier wave of a frequency selected by a channel selection signal from among the frequency-divided channels.

The modulation circuit 10-3 modulates the carrier wave selected by the channel selection signal with transmission data. This frequency-modulated signal is transmitted to the multiplex signal data transfer space 6.
The signal is sent to the demodulation circuit 11-1 in the upper left corner of FIG. 2 (b).

The demodulation circuit 10-4 demodulates the modulated wave notified from the modulation/demodulation unit 8 of the file device W9 via the multiplexed signal data transfer space 6, and extracts received data.

With the above configuration, a channel selection signal corresponding to an empty channel is transmitted from the file control device 3 to the carrier wave oscillator 10.
-2, modulates the transmission data into the frequency band of the empty channel, and sends it to the multiple signal data transfer space 6. Further, a modulated signal received from the multiplexed signal data transfer space 6 is demodulated by a demodulation circuit 104, and received data is extracted.

Figure 2 (b) shows the file device 9 and modulation/demodulation unit 8 in Figure 1.
The configuration diagram is shown below. Here, the demodulation circuit 11-1 receives the modulated signal sent out from the modulation circuit 10-3 in FIG. be.

The unique number identification circuit 11-2 extracts a unique number (a unique number assigned to the file devices W9-1 to 9-m) from the signal demodulated by the demodulation circuit 11-1, and inputs it to the comparison circuit 11-3. It is.

The comparison circuit 11-3 compares the unique number inputted from the unique number identification circuit 11-2 with the unique number unique to the device composed of the file device W9, and when the comparison circuit 11-3 compares the unique number inputted from the unique number identification circuit 11-2 with the unique number unique to the device composed of the file device W9. It recognizes the signal and notifies the file device 9 of the matching signal.

When the matching signal is input from the comparator circuit 11-3, the AND circuit 11-4 outputs the received data demodulated by the demodulation circuit 11-1 to the file device 9 as data addressed to its own file device.
Notify.

The carrier wave transmitter 11-5 transmits a carrier wave corresponding to the channel selection signal notified from the file device 9, and supplies the carrier wave to the modulation circuit 11-6 and the like.

The modulation circuit 11-6 modulates the transmission data from the file device f9 and sends it to the multiplex signal data transfer space 6.

With the above configuration, a signal addressed to the own file device 9 is taken in as received data from the multiplexed signal data transfer space 6. Further, the transmission data is modulated by the modulation circuit 11-6 and sent to the multiplexed signal data transfer space 6.

Next, the operations of the configurations in FIGS. 1 and 2 will be explained in detail in the order of FIG. 3 through [phase].

In FIG. 3, the host 1 issues an access command to the file control device 3.

(2) In response to the issuance of the access command (2), it is determined whether there is an empty channel and whether the corresponding file device is empty. This is because the file control device 3, which has received the issuance of an access command from the host 1 at (3), issues a connection request to the channel allocation unit 5, and the channel allocation unit 5 refers to the channel use table 51 to find an empty channel. It is determined whether the file device 9 to which the access request was made is empty by referring to the file device use table 5-2. Y
In the case of ES, perform ■. If No, there is no empty channel, or the file device to which the access request was made is not free, so the process waits.

(2) Modulates and sends an access command to an empty channel. This means that the file control device 3 assigns the empty channel number assigned by the channel assignment unit 5 to the D
/A converter 10-1, the channel selection signal is input to the carrier wave oscillator 10-2, the carrier wave corresponding to the empty channel is input to the modulation circuit 10-3, and transmission data (here, access command) is transmitted. Modulated by the modulation circuit 10-3 and demodulated via the multiplexed signal data transfer space 6 (FIG. 2(b))! 27
The same number is sent to route 11-1.

(2) is received by the corresponding file device. This is the second
FIG. The data is compared with the number, and if they match, the file device 9 receives the data (access command) as received data via the AND circuit 11-4. This results in
The file control device 3 and the corresponding file device M9 are connected via a channel, and the file device 9 receives the access command.

■ Processes the access command. This means processing the access command received in ■. For example, if this access command is a read command, the data read from the read area specified by the read command is sent to the file control device. On the other hand, in the case of a write command, data to be written is transferred from the file control device 3, and this is written to the corresponding write area.

■Sends and receives data. In this case, in response to the access command in ■, the file control device 3 and the corresponding file device W9 are connected via a channel in [phase], and data is transferred from the file device to the host 1 at the time of read. When writing, the data is transferred from host 1 to the file device and written.

[Phase] sends a completion notification to the effect that processing of [Phase]'s access command has been completed via the file system via the channel? i[Il Notify device 3.

In [phase], the file control device 3 that received the termination notification from the file device 9 in [phase] releases the channel and notifies the host 1 of the termination notification.

[Phase] recognizes that the host 1 has received the completion notification from the file control bag W3 and has completed the series of access processing.

FIG. 4 shows an example of a table according to the present invention.

FIG. 4(A) shows an example of the channel usage table 5-1. The channel numbers in this channel usage table 5-1 represent channel numbers in the multiplex signal data transfer space 6. As for the usage status, 0 indicates unused and 1 indicates in use. Exclusive management can be performed by setting 1 in this channel use table 5-1 when a channel is in use. In addition, when connecting from multiple independent hosts, it can be used to limit and prioritize the channels that should be used by file control devices and file devices, and to use them when they are unimplemented or under maintenance. It may be possible to manage the information by adding information such as "not possible".

FIG. 4(b) shows an example of the file device usage table 5-2. The file device number in this file device usage table 5-2 represents the number of the file device 9. As for the usage status, 0 indicates unused and 1 indicates in use.

Therefore, the channel allocation unit 5 in FIG. 1 refers to the channel use table 5-1 and the file device use table 5-2, and determines whether there is an empty channel in response to a connection request from the file control device 3. , and it is possible to easily find out whether the corresponding file device 9 is empty or not.

FIG. 5 shows a configuration diagram of another embodiment of the present invention.

This means that when the channel allocation section 5 in FIG. file control device 3 assigns a destination (unique number) and sends a modulated signal (connection request) to the channel, and the file with this destination (unique number) that was monitoring the channel The modulation/demodulation section 8 of the device W9 was configured to take in the signal (connection request). On the other hand, FIG. 5 shows a modulation/demodulation section 5-4 provided exclusively for the channel allocation section 5-3 to receive the channel number allocated by the channel allocation section 5-3.
The corresponding modulation/demodulation section 8 is notified via the multiplexed signal data transfer space 6. Therefore, the file control device 3 directs the data (
access request, etc.) and sends it out to the multiplex signal data transfer space 6. Correspondingly, the modulation/demodulation section 8 of the corresponding file device 9 has already been assigned to the channel assignment section 5-3.
Since you are notified that data will be transferred by specifying a channel number, you can monitor only the channel with the specified channel number, eliminating the need to monitor all channels, and also assigning a unique number (destination) to the channel. There is no need to send out the data, which simplifies the process.

〔Effect of the invention〕

As explained above, according to the present invention, a configuration is adopted in which a plurality of channels are provided between the file control device 3 and the file device W9 by multiplex modulation, and data etc. are transferred using empty channels. Therefore, a large number of independent connections can be provided between the file control device 3 and the file device 9, and the number of signal lines can be reduced and efficiency can be improved. This makes it possible to reduce the number of conventional cables shown in FIG. 6 and increase the number of interconnection channels, which has great effects in terms of performance and cost in realizing a large-scale file system device.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of one embodiment of the present invention, Fig. 2 is a main system configuration diagram of the present invention, Fig. 3 is an explanatory diagram of the operation of the present invention, and Fig. 4 is a diagram illustrating the operation of the present invention.
The figure shows an example of a table according to the present invention, FIG. 5 shows a configuration diagram of another embodiment of the present invention, and FIG. 6 shows an internal connection diagram of a conventional file system device. In the figure, 1 is the host, 3 is the file system 'a device, 4.5-
4.8 is a modulation/demodulation section, 5.5-3 is a channel assignment section,
5-1 represents a channel use table, 5-2 a file device use table, 6 a multiple signal data transfer space, and 9 a file device.

Claims (1)

[Claims] In a file system device configured to interconnect a file control device and a file device, a channel use table (5-1) for managing the availability of a plurality of channels, a file device (9-1), ) and the file device usage table (5-2) that manages the space of the modulator/demodulator (4-2).
) is provided on the side of the file control device (2), and a modulation/demodulation section (8) is provided on the side of the file device (9) to respond to access requests from the host (1) to a certain file control device (3). and use the above channel usage table (5
-1) and the file device usage table (5-2), and if the channel is empty and the corresponding file device (9)
When it turns out that the file control device (3) is empty, the modulation and demodulation section (4), the empty channel, and the modulation and demodulation section (8
) A file system device characterized in that it is configured to be connected to a corresponding file device (9) to perform data transfer, etc.