Calculating recovery time of an application system

• US 7,657,583 B2
• Filed: 12/01/2005
• Issued: 02/02/2010
• Est. Priority Date: 12/29/2004
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Erdmenger, Joerg, Oldengott, Hans-Ulrich
• Primary Examiner(s): Ali; Mohammad
• Assistant Examiner(s): PENG, HUAWEN A
• Application Number:
  US11/291,440
• Publication Number:
  US 20060173870A1
• Time in Patent Office: 1,524 Days
• Field of Search: None
• US Class Current: 707/674
• CPC Class Codes: G06F 11/1461 Backup scheduling policy
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/1471 involving logging of persistent data for recovery

Abstract

Mechanisms are provided for calculating a recovery time (t_r) of an application system in a computer system. The mechanisms tune the computer system dynamically. A recovery time (t_r) is calculated and controlled within flexible predefined time slices and compared to a predefined time period (t₀). A trigger is set in the case in which the calculated recovery time (t_r) exceeds the predefined time period (t₀). The mechanisms determine a type of redolog used during a backup process and a corresponding recovery speed value associated with the type of redolog. The recovery time is calculated based on the type of redolog used during the backup process and the corresponding recovery speed value associated with the type of redolog.

Claims

1. A method, in a data processing system, for calculating a recovery time of an application system in a computer system for tuning the computer system dynamically, the method comprising:

determining, by a recovery calculator of the data processing system, a type of redolog used during a backup process and a corresponding recovery speed value associated with the type of redolog, wherein the type of redolog is one of a plurality of different types of redologs, and wherein the recovery speed value associated with the type of redolog is different from recovery speed values of other types of redologs in the plurality of types of redologs;

calculating, by the recovery calculator, the recovery time based on the type of redolog used during the backup process and the corresponding recovery speed value associated with the type of redolog;

comparing, by the recovery calculator, the calculated recovery time to a predefined maximum recovery time period; and

setting a trigger, in a status monitor of the data processing system, for performing an operation in response to the calculated recovery time exceeding the predefined maximum recovery time period.

2. The method according to claim 1, wherein the calculated recovery time is isochronously displayed for review.

3. The method according to claim 1, wherein, the trigger initiates a warning signal for a user.

4. The method according to claim 1, wherein the trigger initiates a warning signal combined with an activation of additional appropriate system resources for reducing the recovery time.

5. The method according to claim 1, wherein the trigger enables simulator options on a corresponding client for modulating systematically backup performance parameters.

6. The method according to claim 1, wherein an execution plan for a subsequent backup process is generated on the basis of the calculation of the recovery time, the execution plan comprising a schedule of the execution of the subsequent backup process and the subsequent backup process being executed on demand according to the execution plan schedule.

7. The method according to claim 1, wherein the recovery time is determined using the following system parameters:

backup duration of saved data of the application system, an amount of associated redologs of the application system, throughput values for a backup of the redologs, and an overall throughput for a recovery of the saved data with the associated redologs.

13. The method of claim 1, wherein calculating the recovery time further comprises:

calculating a backup duration for the backup process after completion of the backup process; and

calculating the recovery time based on the backup duration and a correction factor, wherein the correction factor represents an adjustment of the backup duration indicative of an amount of time in excess of the backup duration required to perform a restore operation based on the data stored by the backup process.

14. The method of claim 1, wherein calculating the recovery time further comprises:

calculating the recovery time based on a combination of a first value and a second value, wherein the first value is calculated as an amount of data saved during the backup process using a first redolog type, divided by a recovery speed value corresponding to the first redolog type, and wherein the second value is calculated as an amount of data saved during the backup process using a second redolog type, different from the first redolog type, divided by a recovery speed value corresponding to the second redolog type.

15. The method of claim 1, wherein the plurality of types of redologs comprises a first type of redolog in which the redolog is generated during the backup process, and a second type of redolog in which the redolog is generated after the backup process is completed.

16. The method of claim 1, wherein the trigger initiates a simulator that varies performance related configuration parameters of an application system of the data processing system to determine a minimum restore duration and provides an output to a user indicating configuration parameters corresponding to the minimum restore duration.

8. A data processing system, comprising:

a recovery calculator unit in the data processing system; and

a status monitor unit, in the data processing system, coupled to the recovery calculator unit, wherein the recovery calculator unit;

determines a type of redolog used during a backup process and a corresponding recovery speed value associated with the type of redolog, wherein the type of redolog is one of a plurality of different types of redologs, and wherein the recovery speed value associated with the type of redolog is different from recovery speed values of other types of redologs in the plurality of types of redologs,

calculates a recovery time based on the type of redolog used during the backup process and the corresponding recovery speed value associated with the type of redolog,

compares the calculated recovery time to a predefined maximum recovery time period,

and sets a trigger, in the status monitory unit, for performing an operation in response to the calculated recovery time exceeding the predefined maximum recovery time period.

9. The computing system according to claim 8,

wherein the status monitor unit outputs the calculated recovery time to be isochronously displayed for review.

10. The computing system according to claim 8, further comprising a generating unit for generating an execution plan for a subsequent backup process on the basis of the calculation of the recovery time, the execution plan comprising a schedule of the execution of the subsequent backup according to which the subsequent backup can be executed.

11. The computing system according to claim 8, wherein the recovery time is determined using the following system parameters:

backup duration of saved data of the application system, an amount of associated redologs of the application system, throughput values for a backup of the redologs and an overall throughput for a recovery of the saved data with the associated redologs.

12. A computer program product in a computer-readable storage medium for carrying out a method when the computer program is run on a computer, the method comprising:

determining a type of redolog used during a backup process and a corresponding recovery speed value associated with the type of redolog, wherein the type of redolog is one of a plurality of different types of redologs, and wherein the recovery speed value associated with the type of redolog is different from recovery speed values of other types of redologs in the plurality of types of redologs;

calculating a recovery time of an application system in a computer system based on the type of redolog used during the backup process and the corresponding recovery speed value associated with the type of redolog;

comparing the calculated recovery time to a predefined maximum recovery time period; and

setting a trigger for performing an operation in response to the calculated recovery time exceeding the predefined maximum recovery time period.

17. The computer program product of claim 12, wherein calculating the recovery time further comprises:

calculating a backup duration for the backup process after completion of the backup process; and

calculating the recovery time based on the backup duration and a correction factor, wherein the correction factor represents an adjustment of the backup duration indicative of an amount of time in excess of the backup duration required to perform a restore operation based on the data stored by the backup process.

18. The computer program product of claim 12, wherein calculating the recovery time further comprises:

calculating the recovery time based on a combination of a first value and a second value, wherein the first value is calculated as an amount of data saved during the backup process using a first redolog type, divided by a recovery speed value corresponding to the first redolog type, and wherein the second value is calculated as an amount of data saved during the backup process using a second redolog type, different from the first redolog type, divided by a recovery speed value corresponding to the second redolog type.

19. The computer program product of claim 12, wherein the plurality of types of redologs comprises a first type of redolog in which the redolog is generated during the backup process, and a second type of redolog in which the redolog is generated after the backup process is completed.

20. The computer program product of claim 12, wherein the trigger initiates a simulator that varies performance related configuration parameters of an application system of the data processing system to determine a minimum restore duration and provides an output to a user indicating configuration parameters corresponding to the minimum restore duration.