KR0168783B1 - Tape backup for exchange system - Google Patents

Abstract

In a data backup method of an exchange including a hard disk drive and a tape drive, a tape backup method of maintaining a backup data until an error occurs when a tape failure occurs during a tape backup and replacing the tape with another tape to continue the backup operation It is started. According to the present invention, when a tape failure error occurs during the tape backup operation, the backup data is maintained on the current tape until the error occurs, and the backup operation is continued by replacing another tape, thereby saving backup time. In addition, there is an advantage that can be attributable to the efficient use of the tape because the data is recorded to the defective point of the tape in which the failure occurs.

Description

Tape backup method

1 is a block diagram related to tape backup of a typical exchange.

2 is a recording format state of a general tape.

3 is a conventional tape backup flow chart.

4 is a flowchart of performing a tape backup according to an embodiment of the present invention.

5 is a flowchart illustrating a hardware error (H / W error) processing subroutine execution flow diagram in FIG. 4.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data back up method in an electronic switchboard, and more particularly, to a tape backup method for storing a database and an operating program stored in a switching system using a tape drive.

In general, exchanges have a large amount of data, and data backup in the exchanges is an important method of operating a system in terms of data protection. At this time, although several backup devices can be used to back up a large amount of data of the exchange, a tape drive is a backup device that is widely used in capacity and price.

1 is a block diagram related to tape backup of a general switch,

A central processing unit 10 for controlling the overall operation of the exchanger according to a predetermined program, a hard disk drive 20 as an external storage device, the hard disk drive 20 and the central processing unit 10; A disk drive controller (30) connected therebetween, a tape drive 40 as an external storage device, and a tape drive controller (Tape) connected between the tape drive 40 and the central processing unit 10. drive controller: 50).

2 is a recording format state diagram of a general tape, and includes the volume (VOL1, VOL2), FM (File Mark: *), header data (HDR1, HDR2), data, End Of File (EOF1, EOF2), and so on. End Of Volumes (EOV1, EOV2) and the like are recorded.

3 is a conventional tape backup flow chart.

Hereinafter, a conventional tape backup method will be described in detail with reference to the accompanying drawings.

First, when the CPU 10 receives a file copy request command in the hard disk drive 20 from a higher level controller (not shown) in step 301, the device of the tape drive 40 in step 303. Device) status. The control unit may be a main module of the exchange. In step 305, if the tape drive 40 is busy or the hardware device state of the tape drive 40 is detected as abnormal, the CPU 10 outputs a corresponding error result in step 307 and performs a backup routine. To exit.

However, if it is detected in step 305 that the tape drive 40 is unbusy and the hardware device state is normal, the CPU 10 uses the device state of the tape drive 40 in step 309. Busy).

In operation 311, the CPU transmits data to be copied from the hard disk drive 20 to the tape drive through the hard disk drive controller 30 so that the data is written to the tape. At this time, the writing format of the tape is as shown in FIG. 2. One writing data block is composed of F.M, header data (HDR1, HDR2), F.M, 2K bytes of data, EOF1, EOF2.

In step 313, the CPU 10 receives the result of the write operation from the tape drive 40. In step 315, the CPU 10 searches for the result of the write execution operation, and if the execution operation is successful, in step 317, the central processing unit 10 transmits the success result to the controller of the higher level that requested the copy, and loops to step 301.

However, if it is detected in step 315 that an error has occurred in the execution operation search result, the CPU 10 searches whether the error is a hardware error in step 319.

If a hardware error of the tape drive 40 is detected in step 319, the CPU 10 changes the device state of the tape drive 40 to unbusy in step 321. Here, the hardware error is indicative of a malfunction of the tape drive itself and an error due to a bad tape.

Thereafter, in step 323, the CPU 10 transmits an error result to the upper level controller and terminates.

In addition, in step 319, the CPU 10 performs a subroutine by jumping to the corresponding error processing routine (not shown) when it is found that the execution result is not a hardware error.

However, as described above, the conventional tape backup method has a problem in that the system data backup must be restarted from the beginning because the tape is recognized as a hardware failure when the tape failure occurs during the system backup and the backup execution routine is terminated. In addition, time wasted due to newly started system data backup.

Accordingly, an object of the present invention is to provide a tape backup method that maintains data backed up before an error occurrence and replaces it with another tape when a tape failure error occurs during tape backup.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a tape backup flow chart according to an embodiment of the present invention.

5 is a flowchart illustrating an error processing subroutine when a hardware error occurs in the flowchart of FIG. 4.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 4 and 5. First, in step 401, the central processing unit 10 may be configured in the hard disk drive 20 from a higher level controller (not shown). When the file copy request command is received, the device state of the tape drive 40 is checked in step 403.

In step 405, the CPU 10 outputs a corresponding error result and performs a backup routine when the tape drive 40 is busy or when the hardware state of the tape drive 40 is abnormal. To exit.

However, if it is detected in step 405 that the tape drive 40 is unbusy and the hardware device state is normal, the CPU 10 uses the device state of the tape drive 40 in step 409 ( Busy).

In operation 411, the CPU transmits data to be copied from the hard disk drive 20 to the tape drive 40 through the hard disk drive controller 30 so that the data is written to the tape. At this time, the writing format of the tape is as shown in Figure 2, one writing data block is F.M, header data (HDR1, HER2), F.M. It consists of 2K bytes of data, EOF1, EOF2.

In step 413, the CPU 10 receives the result of the write flood operation from the tape drive 40. In step 415, the CPU 10 searches for the result of the write execution operation, and if the execution operation is successful, in step 417, the CPU 10 transmits the success result to the upper level controller requesting the copy and loops to step 401.

However, if it is detected in step 415 that an error has occurred in the execution operation search result, the CPU 10 searches whether the error is a hardware error in step 419.

Thereafter, if a hardware error of the tape drive 40 is detected in step 419, the CPU 10 searches for a parity error indicating that the error is a bad tape in step 501. In this case, if it is detected in step 501 that there is no parity error, the CPU 10 changes the device state of the tape drive 40 to unbusy in step 503. Thereafter, in step 505, the CPU 10 transmits an error result to the upper level controller and ends the tape routine.

However, if it is detected in step 501 that the parity error, the CPU 10 checks the execution command in step 507. If the execution command identified in step 507 is not a write command in step 509, the process proceeds to step 503 to change the device state of the tape drive 40 to unbusy, and transmits an error result to the upper level controller in step 505. Terminate the tape backup routine.

However, if it is determined in step 509 that the execution command is a write command, the CPU 10 changes the device state of the tape drive 40 to unbusy in step 511. In step 513, the central processing unit 10 controls the tape drive 40 to skip the F.M. In step 517, the central processing unit 10 returns the tape to the F.M portion of the data block in which the writing operation is performed.

In step 517, the CPU 10 writes F.M. In step 519, the CPU 10 writes End of Volume (EOV1, EOV2) indicating the end of data recording of the backup tape.

In operation 521, the CPU 10 writes the F.M.

Thereafter, the central processing unit 10 rewinds the tape in step 523, and in step 525, the central processing unit 10 transmits the EOT process to a control unit (not shown) of a higher level and proceeds to step 401 of FIG. Is returned.

Therefore, as described above, the present invention maintains the data backed up to the current tape until an error occurs when a tape failure occurs during the tape backup, and replaces it with another tape, thereby continuing backup performance, thereby saving backup time. In addition, since the tape to which the failure occurs to record the data to the defect point has the advantage that can be used efficiently.

Claims (6)

A data backup method of an exchanger comprising a hard disk drive and a tape drive, comprising: a tape drive status search step of searching for a use state of the tape drive in response to a data backup request recorded on a hard disk; and a search result of the search step In response to the error in use of the tape drive being detected, an error result is output. If the error is not detected, data recorded in the hard disk on a tape as a magnetic recording medium mounted in the tape drive is stored in a predetermined data unit. A data recording step of writing to the tape and outputting a data recording result; and a recording progress step of returning to the tape drive status searching step if the data recording is performed in response to the data recording result, and corresponding to the data recording result. By above A tape error retrieval step of retrieving whether the error is a tape error if an occurrence of a hardware error of a tape drive is detected, and an error result if not a tape error in response to the tape error retrieval step, and outputting the data if the tape error is a tape error And an error processing step of recording the end of data recording and outputting the end of the tape at the first point of the tape recording point in the recording step. The parity error retrieval step of claim 1, wherein the tape error retrieval step retrieves a parity check error value when a hardware error of the tape drive occurs in response to a result of performing the data recording step. And a tape error processing step of processing the error as a tape error if a parity error is detected in response to an error searching step, and a drive processing step of processing a drive error if the parity error is not corresponding to the parity error searching step. Tape backup method. The drive error process according to claim 1 or 2, wherein if the error processing step is not a tape error corresponding to a search result of the tape error search step, the use state of the tape drive is designated as unused and the error result is output. And a data recording end step of recording the end of data recording at the first point of the tape recording point in the data recording step if the tape error corresponds to the search result of the tape error search step; And a tape error processing step of rewinding the tape and outputting the end of the tape. A data drive method of a tape drive having a tape as a magnetic recording medium for recording predetermined data, the method comprising: a tape drive state retrieving step of retrieving a use state of the tape drive in response to a backup request of data recorded on a predetermined external recording medium; And, in response to the search result of the search step, outputting an error result when a use state error of the tape drive is detected, and writing to the external recording medium on the tape mounted on the tape drive if an error occurrence is not detected. A data recording step of recording the recorded data on the tape in a predetermined data unit and outputting a data recording result; and a recording progress step of returning to the tape drive status retrieving step if data recording is performed in response to the data recording result; The data record In response to the occurrence of a hardware error of the tape drive, a tape error search step of searching for whether the error is a tape error, an error result if the tape error is not corresponding to the tape error search step, and outputting a tape error. And an error processing step of recording the end of data recording at the first point of the tape recording point in the data recording step and outputting the end of the tape. 5. The parity error retrieval step of claim 4, wherein the tape error retrieval step retrieves whether the error is a parity check error when a hardware error of the tape drive occurs in response to a result of performing the data recording step. A tape error processing step of processing the error as a tape error when the error is detected in response to the error searching step, and a drive processing step of processing a drive error if the parity error is not corresponding to the parity error searching step. Tape backup method. 6. The drive error processing step according to claim 4 or 5, wherein if the error processing step is not a tape error in response to a search result of the error searching step, the use state of the tape drive is designated as unused and an error result is output. And a data recording end step of recording the end of data recording at the first point of the tape recording point in the data recording step if the tape error corresponds to the search result of the tape error search step, and the tape according to the data recording end step. And a tape error processing step of rewinding and outputting the end of the tape.