JPS5985562A - Disk control system - Google Patents

Abstract

PURPOSE:To improve the data transfer efficiency of data by giving an access immediately to another disk device which is under a waiting state in case a seek operation is carried out during transfer of data. CONSTITUTION:A processor 1, a system memory 2 and a disk controller 3 are connected to each other via a common bus 4. The controller 3 controls disk devices D1 and D2 for example and incorporates two control tables T1 and T2 to control the information on the devices D1 and D2. Here a deciding part 7 checks the information of the table T2 and transmits a control signal J to switch a switch part 6 to a contact (b) when detects a waiting state under which a seek operation is through with the device D2. Thus the transfer of data is started for a file F2 of the D2. At the same time, the part 7 transmits the signal J to switch the part 6 to a contact (a) when the device D1 is set under a waiting state for end of a seek operation. Then the transfer of data is started with the D1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The invention relates to a disk control method for controlling data transfer between a plurality of disk devices.

tbl Conventional Technology and Problems Seek (5eek) lII] When data is convolved in a disk device that involves a work, if there is an abnormality in the sought cylinder sector (reading/reading is impossible due to damage to the interface, etc.) After writing to a substitute sector of another cylinder prepared in advance (alternate sector processing),
Seek (return) the R/W head to the old cylinder and continue writing data again. Conversely, when accessing a disk device that has undergone alternate sector processing in this way and reading data, a seek operation is always required. In a processing system using a plurality of disk devices, when alternate sector processing (two seek operations) occurs in a certain disk device, the data transfer time inevitably increases. Therefore, in the conventional method, the waiting time of the disk device in the WA or IT state becomes extremely long, resulting in a disadvantage that the data transfer efficiency decreases.

(Cl Purpose of the invention The non-invention was made to solve the above drawbacks,
The purpose is to provide a disk control method that improves data transfer efficiency.

(dl S-formation of the invention The present invention includes a processing device, a plurality of disk devices,
In a processing system that reads/writes data in a disk device based on a data transfer request from a processing device, a plurality of management tables each manage the occurrence state and termination state of a seek operation in the valley disk device; a first disk device that receives a first data transfer request from the processing device, comprising means for comparing and determining data in the management table group and a control means for switching access to the plurality of disk devices; When the seek operation occurs during data transfer, a data transfer request other than the first take transfer request is received from the processing device, and the second disk device that has completed the seek operation performs data transfer. This is a disk control method characterized by: As described above, in a system using a plurality of devices Q)-r', the first task 'iA' during data transfer is
+ If a seek operation (alternative sector processing) occurs in the fir,
If the seek operation of the other (second) disk device (which has already received the take transfer request) has completed, release the W/\1' (wait) state of this second disk device, This is designed to start data transfer immediately.

le) Embodiment of the invention FIG. 1 is a block diagram illustrating an embodiment of the invention. The processing bag 11, the system memory 2, and the tisf control device 3 in FIG. In the embodiment, it is assumed that the Tisfu 11 control device 3 controls two disk devices J) I and 1) 2, and two management tables T that manage information regarding these two disk devices a I) + and D2. ] and 1゛2 are built-in. FIG. 1 (here, command 1jcM from processing device l,
(take transfer request to disk device 1) is issued, followed by command CM2 (disk device tDzi
Assume that a request for transfer is issued.

Upon receiving this, the control unit 5 issues a control signal 1, connects the switching unit 6 to the contact (A) side, starts data transfer (♂L output or writing) of the file F1 in the disk device Dt, and also Information related to the disk device D+ is set in the management table Ip. When a seek operation for i(/W (not shown) occurs during data transfer, the control unit 5 activates the determination unit 7. The determination unit 7 accesses the management table T2 and determines whether the disk device D2 The management table T2 stores current data C82 indicating the current state of the disk device 1)2, system memory address A2, number of unprocessed sectors SN, and control information CT2. Of these, the current data C82 is composed of each data shown in Fig. 2 [al].
Columns a to f in l include processing waiting information W, replacement sector l processing end information, and replacement sector processing start information i'S.
, JC/W operating core information (Jp, seek completion information aK, and wake-up information ST are stored. Also, as the 'lli control information CT2 of the management table 'J2, (The information shown in bl is stored. In other words, the address (FD) of file F2 in FIG.
1) Operation instruction information (Read /Wri re /
5eek, etc.] are stored. This management table T
The setting of the information for 2 is performed by the 'di control unit 5 which first received the command ij CM. In FIG. 1, the determining unit 7 checks the information in the management table T2,
When detecting that the disk device D2 has already completed the seek operation (and has also received the monthly command CM2) and is in the WAIT state, it issues a controller command and switches the switching unit 6 to the contact (
0) side. This (Koyori disk fA position D2
Data transfer of file F can now be started. Figure 3 shows
This is one coach yard.

Management table 1'' in FIG. 1 is management table T
Similarly to 2, the information regarding the disk device [) is set, and at the end of the data transfer or when a seek operation occurs, the determination unit 7 accesses the management file '1'. Check the status of disk device]-11. Disk device.

When the disk device D1 is in a waiting state for the completion of the seek, the determining unit 7 issues a 10 control signal @J, switches the switching unit 6 to the contact A1 side, and starts data transfer from the disk device D1.

[fl Effects of the Invention As described above, the present invention provides a processing system in which data is transferred by accessing a plurality of disk devices (ra-fi), and when a seek operation 2 occurs during data transfer. ,
Since it is possible to immediately access another disk device in a "waiting state", it has the advantage of improving data transfer efficiency.

[Brief explanation of the drawing]

Figure 1 is a block diagram illustrating an embodiment of the invention, and Figure 2 is a control block diagram explaining an embodiment of the invention.
Figure 3 explains one embodiment of the present invention] This is a coachyard, and the symbols used in the figure are as follows: 1 is a processing unit, 2 is a cystine, a memory, and 3 is a disk f
t+i control unit v14 (O common bus, 5 is a control unit, 6 is a switching unit, 7 is a determination unit, A11A is a system memory address, CM, CM is a command, cs, , cs. is current data, CT, , CT is control information, D, ,
l). is the disk device, E is the replacement sector processing completion information, F...
F2 is the file, FD is the file address, OP is R
/W information indicating that it is in operation, PS is replacement sector processing start information, 8 is seek completion information, SN + , 8Ny is the number of unprocessed sectors, ST is activated information, W is processing waiting information, a
+b+c+d+e+ rlglh is a column, and port 41 indicates a contact point. No. t (iJ 2 Knee)” ￥-2 figure (+2)

Claims (1)

[Claims] In a processing system that includes a processing device and a plurality of disk devices, and performs writing/indulging of data in the disk device based on a data transfer request from the processing device, the occurrence state of a seek operation in each of the disk devices. and a management table for managing end status information, a means for comparing and determining data in the management table, and a control means for switching access to the plurality of disk devices, and a control means for handling data transfer requests from the processing device. When the seek operation occurs during the received data transfer of the first disk device, the second disk device receives a data transfer request other than the first data transfer request from the processing device and has completed the seek operation. A disk control method characterized in that data transfer of a disk device is performed.