Catalog backup and recovery using logical mirroring

Patent metadata

Field	Value
Publication number	US-10606802-B2
Application number	US-201715595681-A
Country	US
Kind code	B2
Filing date	May 15, 2017
Priority date	May 15, 2017
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A computer-implemented method according to one embodiment includes intercepting one or more updates made to a catalog data set, storing the one or more updates in an update buffer, retrieving the one or more updates from the update buffer, sequentially applying the one or more updates to a backup catalog data set, identifying a request to replace the catalog data set, and replacing the catalog data set with the backup catalog data set, in response to the request.

First claim

What is claimed is:

1. A computer-implemented method, comprising:
intercepting one or more updates made to a catalog data set, where:
each of the one or more updates includes a system management facility (SMF) record, and
the one or more updates are intercepted utilizing a program hook that retrieves the one or more updates from an SMF Exit routine;

storing the one or more updates sequentially within an update buffer;
retrieving the one or more updates from the update buffer, including sequentially reading the one or more updates from the update buffer;
sequentially applying the one or more updates to a backup catalog data set, the backup catalog data set including a logically mirrored copy of a catalog data set;
identifying a request to replace the catalog data set; and
replacing the catalog data set with the backup catalog data set, in response to the request including:
scanning the backup catalog data set to confirm an integrity of the backup catalog data set,
in response to a confirmation of the integrity of the backup catalog data set, modifying one or more control blocks within a catalog address space of a mainframe computing system to change references from the catalog data set to the backup catalog data set;

wherein replacing the catalog data set with the backup catalog data set utilizes a dynamic device reconfiguration (DDR) Swap interface for mirrored volume switching to direct updates to the backup catalog data set.

2. The computer-implemented method of claim 1 , wherein the catalog data includes a plurality of basic catalog structure (BCS) catalogs within the mainframe computing system.

3. The computer-implemented method of claim 1 , wherein the catalog data set includes a set of files used by the mainframe computing system to describe one or more data set attributes and indicate volumes on which a data set is located, the data set including a set of data that is used by an application.

4. The computer-implemented method of claim 1 , wherein the SMF record includes an insert action recorded in a 61 type.

5. The computer-implemented method of claim 1 , wherein the SMF record includes a delete action recorded in a 65 type.

6. The computer-implemented method of claim 1 , wherein the SMF record includes an alter action recorded in a 66 type.

7. The computer-implemented method of claim 1 , wherein the request to replace the catalog data set is sent in response to a determination that the catalog data set is not available or is corrupt.

8. The computer-implemented method of claim 1 , wherein:
the catalog data includes a plurality of basic catalog structure (BCS) catalogs within the mainframe computing system,
the catalog data set includes a set of files used by the mainframe computing system to describe one or more data set attributes and indicate volumes on which a data set is located, the data set including a set of data that is used by an application,
the request to replace the catalog data set is sent in response to a determination that the catalog data set is not available or is corrupt, and
the SMF record includes an insert action recorded in a 61 type.

9. A computer program product for catalog backup and recovery using logical mirroring, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a processor to cause the processor to perform a method comprising:
intercepting one or more updates made to a catalog data set, utilizing the processor, where:
each of the one or more updates includes a system management facility (SMF) record, and
the one or more updates are intercepted utilizing a program hook that retrieves the one or more updates from an SMF Exit routine;

storing the one or more updates sequentially within an update buffer, utilizing the processor;
retrieving the one or more updates from the update buffer, utilizing the processor including sequentially reading the one or more updates from the update buffer;
sequentially applying the one or more updates to a backup catalog data set, utilizing the processor, the backup catalog data set including a logically mirrored copy of a catalog data set;
identifying a request to replace the catalog data set, utilizing the processor; and
replacing the catalog data set with the backup catalog data set, in response to the request, utilizing the processor, including:
scanning the backup catalog data set to confirm an integrity of the backup catalog data set,
in response to a confirmation of the integrity of the backup catalog data set, modifying one or more control blocks within a catalog address space of a mainframe computing system to change references from the catalog data set to the backup catalog data set;

wherein replacing the catalog data set with the backup catalog data set utilizes a dynamic device reconfiguration (DDR) Swap interface for mirrored volume switching to direct updates to the backup catalog data set.

10. The computer program product of claim 9 , wherein the catalog data includes a plurality of basic catalog structure (BCS) catalogs within the mainframe computing system.

11. The computer program product of claim 9 , wherein the catalog data set includes a set of files used by the mainframe computing system to describe one or more data set attributes and indicate volumes on which a data set is located, the data set including a set of data that is used by an application.

12. The computer program product of claim 9 , wherein the SMF record includes an insert action recorded in a 61 type.

13. The computer program product of claim 9 , wherein the SMF record includes a delete action recorded in a 65 type.

14. The computer program product of claim 9 , wherein the SMF record includes an alter action recorded in a 66 type.

15. The computer program product of claim 9 , wherein the request to replace the catalog data set is sent in response to a determination that the catalog data set is not available or is corrupt.

16. The computer program product of claim 9 , wherein:
the catalog data includes a plurality of basic catalog structure (BCS) catalogs within a mainframe computing system,
the catalog data set includes a set of files used by the mainframe computing system to describe one or more data set attributes and indicate volumes on which a data set is located, the data set including a set of data that is used by an application,
the request to replace the catalog data set is sent in response to a determination that the catalog data set is not available or is corrupt, and

the SMF record includes an insert action recorded in a 61 type.

17. A system, comprising:
a processor; and
logic integrated with the processor, executable by the processor, or integrated with and executable by the processor, the logic being configured to:
intercept one or more updates made to a catalog data set, where:
each of the one or more updates includes a system management facility (SMF) record, and
the one or more updates are intercepted utilizing a program hook that retrieves the one or more updates from an SMF Exit routine;

store the one or more updates sequentially within an update buffer;
retrieve the one or more updates from the update buffer, including sequentially reading the one or more updates from the update buffer;
sequentially apply the one or more updates to a backup catalog data set, the backup catalog data set including a logically mirrored copy of a catalog data set;
identify a re

Assignees

• IBM

Inventors

• Erdmann Derek L
• Harris Eric J
• Mccune Franklin E
• Reed Thomas C

Classifications

• G06F2201/84

  Using snapshots, i.e. a logical point-in-time copy of the data · CPC title

• G06F11/1469

  Backup restoration techniques · CPC title

• G06F11/1458

  Management of the backup or restore process · CPC title

• G06F11/2056

  by mirroring · CPC title

• G06F16/128 Primary

  Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion (error detection or correction of the data by redundancy in operations or in hardware G06F11/14, G06F11/16) · CPC title