Detecting damaged areas on magnetic tape based on measuring a number of servo errors

Patent metadata

Field	Value
Publication number	US-11037598-B2
Application number	US-201916660675-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Dec 20, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A computer-implemented method, according to one embodiment, includes: receiving, from a tape drive, a first error location on a magnetic tape where a first error occurred, in addition to determining one or more areas on the magnetic tape to be examined based on the first error location. Independent of a read and/or write operation, the tape drive is instructed to induce relative motion between a tape head and the magnetic tape such that the tape head is positioned adjacent to each of the respective one or more areas in turn. Moreover, each of the one or more areas having a respective number of measured servo errors which exceeds a threshold value is identified as a damaged area of the magnetic tape.

First claim

What is claimed is:

1. A computer-implemented method, comprising:
receiving, from a tape drive, a first error location on a magnetic tape where a first error occurred;
determining one or more areas on the magnetic tape to be examined based on the first error location;
independent of a read and/or write operation, instructing the tape drive to induce relative motion between a tape head and the magnetic tape such that the tape head is positioned adjacent to each of the respective one or more areas in turn;
identifying each of the one or more areas having a respective number of measured servo errors which exceeds a threshold value as a damaged area of the magnetic tape; and
determining one or more areas on a second wrap of the magnetic tape to be examined, wherein the second wrap is adjacent to a first wrap of the magnetic tape which includes the first error location, wherein the one or more areas are determined using a predetermined algorithm.

2. The computer-implemented method as recited in claim 1 , comprising:
determining whether the first error was caused by the tape drive itself; and
in response to determining that the first error was not caused by the tape drive itself, determining the one or more areas on the magnetic tape to be examined based on the first error location,
wherein the first error is a permanent error.

3. The computer-implemented method as recited in claim 1 , comprising:
making a backup copy of data stored in the identified damaged area(s) of the magnetic tape by copying the data from a buffer memory or another storage medium having a copy of the data stored in the identified damaged area(s) of the magnetic tape, wherein the backup copy is stored on a second magnetic tape; and
predicting a presence of one or more other magnetic tapes having a substantially similar damage as that of the magnetic tape based on storage conditions of each of the respective magnetic tapes and/or a number of data operations that have been performed on each of the respective magnetic tapes.

4. The computer-implemented method as recited in claim 1 , comprising:
predicting a presence of one or more other magnetic tapes having a substantially similar damage as that of the magnetic tape based on the identified damaged area(s) of the magnetic tape.

5. The computer-implemented method as recited in claim 1 , comprising:
instructing the magnetic tape be loaded into a second tape drive which is different than the tape drive; and
performing the following process:
determining one or more areas on the magnetic tape to be examined, wherein the one or more areas are determined using a predetermined algorithm which incorporates the first error location,
independent of a read and/or write operation, instructing the second tape drive to induce relative motion between the tape head and the magnetic tape such that the tape head is positioned adjacent to each of the respective one or more areas in turn,
instructing the second tape drive to measure a number of servo errors that occur in each of the respective one or more areas, and
identifying each of the one or more areas having a respective number of measured servo errors which exceeds a threshold value as a damaged area of the magnetic tape.

6. The computer-implemented method as recited in claim 1 , comprising:
determining whether a tape map includes records of read and/or write and/or locate operations performed in a current load of the magnetic tape,
wherein identifying each of the one or more areas as a damaged area of the magnetic tape is performed using the records in response to determining that the tape map includes the records.

7. The computer-implemented method as recited in claim 1 , comprising:
independent of a read and/or write operation, instructing the tape drive to induce relative motion between the tape head and the magnetic tape such that the tape head is positioned adjacent to each of the respective one or more areas on the second wrap in turn;
instructing the tape drive to use the tape head to measure a number of servo errors that occur in each of the respective one or more areas on the second wrap; and
identifying each of the one or more areas on the second wrap having a respective number of measured servo errors which exceeds the threshold value as a damaged area of the magnetic tape.

8. A computer program product, comprising a computer readable storage medium having program instructions embodied therewith, the program instructions readable and/or executable by a processor to cause the processor to:
receive, by the processor, a first error location on a magnetic tape where a first error occurred;
determine, by the processor, one or more areas on the magnetic tape to be examined based on the first error location;
independent of a read and/or write operation, instruct, by the processor, a tape drive to induce relative motion between a tape head and the magnetic tape such that the tape head is positioned adjacent to each of the respective one or more areas in turn;
identify, by the processor, each of the one or more areas having a respective number of measured servo errors which exceeds a threshold value as a damaged area of the magnetic tape; and
determine, by the processor, one or more areas on a second wrap of the magnetic tape to be examined, wherein the second wrap is adjacent to a first wrap of the magnetic tape which includes the first error location, wherein the one or more areas are determined using a predetermined algorithm.

9. The computer program product as recited in claim 8 , the program instructions readable and/or executable by the processor to cause the processor to:
determine, by the processor, whether the first error was caused by the tape drive itself; and
in response to determining that the first error was not caused by the tape drive itself, determine, by the processor, the one or more areas on the magnetic tape to be examined based on the first error location,
wherein the first error is a permanent error.

10. The computer program product as recited in claim 8 , the program instructions readable and/or executable by the processor to cause the processor to:
make, by the processor, a backup copy of data stored in the identified damaged area(s) of the magnetic tape by copying the data from a buffer memory or another storage medium having a copy of the data stored in the identified damaged area(s) of the magnetic tape, wherein the backup copy is stored on a second magnetic tape; and
predict, by the processor, a presence of one or more other magnetic tapes having a substantially similar damage as that of the magnetic tape based on a number of data operations that have been performed on each of the respective magnetic tapes.

11. The computer program product as recited in claim 8 , the program instructions readable and/or executable by the processor to cause the processor to:
predict, by the processor, a presence of one or more other magnetic tapes having a substantially similar damage as that of the magnetic tape based on the identified damaged area(s) of the magnetic tape.

12. The computer program product as recited in claim 8 , the program instructions readable and/or executable by the processor to cause the processor to:
instruct, by the processor, the magnetic tape be loaded into a second tape drive which is different than the tape drive; and
perform, by the processor, the following process:
determining one or more areas on the magnetic tape to be examined, wherein the one or more areas are determined using a predetermined algorithm which incorporates the first error location,
independent of a read and/or write operation, instructing the second tape drive to i

Assignees

• IBM

Inventors

• Yamamoto Noriko
• Miyamura Tsuyoshi
• Itagaki Hiroshi
• Hasegawa Tohru
• Matsui Sosuke
• Mitsuma Shinsuke

Classifications

• G11B20/1886 Primary

  with tapes · CPC title

• G11B2020/1826

  wherein a defect list or error map is generated · CPC title

• G11B27/36

  Monitoring, i.e. supervising the progress of recording or reproducing {(for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06)} · CPC title

• G11B5/584

  for track following on tapes · CPC title

• G11B5/5504

  across tape tracks · CPC title