Corrupted track analyzer

Patent metadata

Field	Value
Publication number	US-11061750-B2
Application number	US-201816124153-A
Country	US
Kind code	B2
Filing date	Sep 6, 2018
Priority date	Sep 6, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A method for analyzing data corruption is disclosed. In one embodiment, such a method includes identifying a data set to analyze for data corruption. This data set resides on tracks of a volume. The method further determines, from control information associated with the volume, on which tracks of the volume the data set resides. The method reads content of the data set without opening the data set by performing full-track reads of the tracks. The method further determines an expected format of the content by analyzing the control information. An actual format of the content is compared to the expected format to identify areas of the data set that may be corrupt. A corresponding system and computer program product are also disclosed.

First claim

The invention claimed is:

1. A method for analyzing data corruption, the method comprising:
identifying a data set to analyze for data corruption, the data set residing on tracks of a volume;
determining, from control information associated with the volume, the tracks that the data set resides on;
reading content of the data set by performing full-track reads of the tracks without opening the data set and without using any of a basic sequential access method (BSAM), queued sequential access method (QSAM), and virtual storage access method (VSAM) that is customarily used to access the data set;
determining an expected format of the content by analyzing the control information; and
comparing an actual format of the content to the expected format to identify areas of the data set that are corrupt.

2. The method of claim 1 , wherein the control information comprises a volume table of contents (VTOC) associated with the volume.

3. The method of claim 1 , wherein the control information comprises a catalog associated with the volume.

4. The method of claim 1 , wherein the expected format includes an expected block size associated with the content.

5. The method of claim 1 , wherein the expected format includes an expected record length associated with the content.

6. The method of claim 1 , further comprising extracting at least one of good blocks and good records from the content for storage in a recovery data set.

7. A computer program product for analyzing data corruption, the computer program product comprising a computer-readable storage medium having computer-usable program code for execution on at least one processor, the computer-usable program code causing the at least one processor to:
identify a data set to analyze for data corruption, the data set residing on tracks of a volume;
determine, from control information associated with the volume, the tracks that the data set resides on;
read content of the data set by performing full-track reads of the tracks without opening the data set and without using any of a basic sequential access method (BSAM), queued sequential access method (QSAM), and virtual storage access method (VSAM) that is customarily used to access the data set;
determine an expected format of the content by analyzing the control information; and
compare an actual format of the content to the expected format to identify areas of the data set that are corrupt.

8. The computer program product of claim 7 , wherein the control information comprises a volume table of contents (VTOC) associated with the volume.

9. The computer program product of claim 7 , wherein the control information comprises a catalog associated with the volume.

10. The computer program product of claim 7 , wherein the expected format includes an expected block size associated with the content.

11. The computer program product of claim 7 , wherein the expected format includes an expected record length associated with the content.

12. The computer program product of claim 7 , wherein the computer-usable program code is further configured to extract at least one of good blocks and good records from the content for storage in a recovery data set.

13. A system for analyzing data corruption, the system comprising:
at least one processor;
at least one memory device operably coupled to the at least one processor and storing instructions for execution on the at least one processor, the instructions causing the at least one processor to:
identify a data set to analyze for data corruption, the data set residing on tracks of a volume;
determine, from control information associated with the volume, the tracks that the data set resides on;
read content of the data set by performing full-track reads of the tracks without opening the data set and without using any of a basic sequential access method (BSAM), queued sequential access method (QSAM), and virtual storage access method (VSAM) that is customarily used to access the data set;
determine an expected format of the content by analyzing the control information; and
compare an actual format of the content to the expected format to identify areas of the data set that are corrupt.

14. The system of claim 13 , wherein the control information comprises a volume table of contents (VTOC) associated with the volume.

15. The system of claim 13 , wherein the control information comprises a catalog associated with the volume.

16. The system of claim 13 , wherein the expected format includes an expected block size associated with the content.

17. The system of claim 13 , wherein the expected format includes an expected record length associated with the content.

Assignees

• IBM

Inventors

• Chauvet Philip R
• Reed David C
• Mccune Franklin E
• Smith Keith R

Classifications

• G11B27/327

  Table of contents · CPC title

• G06F11/0727 Primary

  in a storage system, e.g. in a DASD or network based storage system (drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097) · CPC title

• G11B27/328

  on a tape [TTOC] · CPC title

• G11B27/329

  on a disc [VTOC] · CPC title

• G06F11/073

  in a memory management context, e.g. virtual memory or cache management (memory management G06F12/00; testing of static memory units G11C29/00) · CPC title