File management in a file system

• US 9,851,927 B2
• Filed: 09/01/2015
• Issued: 12/26/2017
• Est. Priority Date: 09/01/2015
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Hasegawa, Tohru, Matsui, Sosuke, Mitsuma, Shinsuke, Miyamura, Tsuyoshi, Yamamoto, Noriko
• Primary Examiner(s): Rones, Charles
• Assistant Examiner(s): WONG, NANCI N
• Application Number:
  US14/842,145
• Publication Number:
  US 20170060895A1
• Time in Patent Office: 847 Days
• CPC Class Codes: G06F 16/16 File or folder operations, e.g. details of user interfaces specifically adapted to file systems
• CPC Class Codes: G06F 16/1847 specifically adapted to static storage, e.g. adapted to flash memory or SSD
• CPC Class Codes: G06F 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/0643 Management of files
• CPC Class Codes: G06F 3/0644 Management of space entities, e.g. partitions, extents, pools
• CPC Class Codes: G06F 3/0682 Tape device
• CPC Class Codes: G06F 3/0685 Hybrid storage combining heterogeneous device types, e.g. hierarchical storage, hybrid arrays

Abstract

A memory that includes a data partition and an index partition is mounted. The data partition includes an original data and an original index written directly after the original data. The index partition includes the original index at the beginning of the index partition. The first data is written to a data partition of the memory. The first data is written directly after the at least one data on the data partition and the original index is deleted and invalidated. Responsive to a time interval elapsing, a first index is written to the data partition of the memory directly after the first data. The time interval starts at the writing of the first data. Responsive to the time interval elapsing, the first index is written to the index partition of the memory at the closest location, in terms of movement time, to the first index on the data partition.

Claims

1. A method for writing data, the method comprising the steps of:

mounting, by one or more computer processors, a memory, wherein the memory includes a data partition and an index partition, and wherein the data partition includes an original data and an original index written directly after the original data, and wherein the index partition includes the original index at the beginning of the index partition, and wherein the index partition is placed vertically above the data partition, and wherein a beginning of the index partition aligns with a beginning of the data partition;

writing, by one or more computer processors, a first data to the data partition of the memory, wherein the first data is written directly after the original data on the data partition and wherein the original index is deleted on the data partition;

responsive to a time interval elapsing, wherein the time interval starts at the writing of the first data, writing, by one or more computer processors, a first index to the data partition of the memory, wherein the first index is written directly after the first data on the data partition; and

responsive to the time interval elapsing, wherein the time interval starts at the writing of the first data, writing, by one or more computer processors, the first index to the index partition of the memory, wherein the first index is written on the index partition at a closest location, in terms of movement time, to the first index on the data partition.

2. The method of claim 1, wherein the memory is a linear tape file system.

3. The method of claim 1, further comprising:

responsive to receiving an indication to unmount the memory,

deleting, by one or more computer processors, the first index from the index partition of the memory; and

writing, by one or more computer processors, the first index to the index partition of the memory, wherein the first index is written at the beginning of the index partition.

4. The method of claim 1, wherein the original index is written on a non-volatile cartridge memory in the memory and wherein the first index is written on the non-volatile cartridge memory in the memory.

5. The method of claim 1, wherein the index includes one or more of the following:

a physical location in which the data is stored, a size of the data, and a file name of the data.

6. The method of claim 1, wherein the first index is written on the index partition at a location after the original index.

7. The method of claim 1, wherein the first index is written in extensible markup language (XML).

8. A computer program product for writing data, the computer program product comprising:

one or more computer readable storage media; and

program instructions stored on the one or more computer readable storage media, the program instructions comprising;

program instructions to mount a memory, wherein the memory includes a data partition and an index partition, and wherein the data partition includes an original data and an original index written directly after the original data, and wherein the index partition includes the original index at the beginning of the index partition, and wherein the index partition is placed vertically above the data partition, and wherein a beginning of the index partition aligns with a beginning of the data partition;

program instructions to write the first data to a data partition of the memory, wherein the first data is written directly after the original data on the data partition and wherein the original index is deleted on the data partition;

program instructions, responsive to a time interval elapsing, wherein the time interval starts at the writing of the first data, to write a first index to the data partition of the memory, wherein the first index is written directly after the first data on the data partition; and

program instructions, responsive to a time interval elapsing, wherein the time interval starts at the writing of the first data, to write the first index to the index partition of the memory, wherein the first index is written on the index partition at a closest location, in terms of movement time, to the first index on the data partition.

9. The computer program product of claim 8, wherein the memory is a linear tape file system.

10. The computer program product of claim 8, further comprising program instructions, stored on the one or more computer readable storage media, to:

responsive to receiving an indication to unmount the memory, delete the first index from the index partition of the memory; and

write the first index to the index partition of the memory, wherein the first index is written at the beginning of the index partition.

11. The computer program product of claim 8, wherein the original index is written on a non-volatile cartridge memory in the memory and wherein the first index is written on the non-volatile cartridge memory in the memory.

12. The computer program product of claim 8, wherein the index includes one or more of the following:

a physical location in which the data is stored, a size of the data, and a file name of the data.

13. The computer program product of claim 8, wherein the first index is written on the index partition at a location after the original index.

14. The computer program product of claim 8, wherein the first index is written in extensible markup language (XML).

15. A computer system for writing data, the computer system comprising:

one or more computer processors;

one or more computer readable storage media; and

program instructions, stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising;

program instructions to mount a memory, wherein the memory includes a data partition and an index partition, and wherein the data partition includes an original data and an original index written directly after the original data, and wherein the index partition includes the original index at the beginning of the index partition, and wherein the index partition is placed vertically above the data partition, and wherein a beginning of the index partition aligns with a beginning of the data partition;

program instructions to write the first data to a data partition of the memory, wherein the first data is written directly after the original data on the data partition and wherein the original index is deleted on the data partition;

program instructions, responsive to a time interval elapsing, wherein the time interval starts at the writing of the first data, to write a first index to the data partition of the memory, wherein the first index is written directly after the first data on the data partition; and

program instructions, responsive to a time interval elapsing, wherein the time interval starts at the writing of the first data, to write the first index to the index partition of the memory, wherein the first index is written on the index partition at a closest location, in terms of movement time, to the first index on the data partition.

16. The computer system of claim 15, wherein the memory is a linear tape file system.

17. The computer system of claim 15, further comprising program instructions, stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, to:

responsive to receiving an indication to unmount the memory, delete the first index from the index partition of the memory; and

write the first index to the index partition of the memory, wherein the first index is written at the beginning of the index partition.

18. The computer system of claim 15, wherein the original index is written on a non-volatile cartridge memory in the memory and wherein the first index is written on the non-volatile cartridge memory in the memory.

19. The computer system of claim 15, wherein the index includes one or more of the following:

a physical location in which the data is stored, a size of the data, and a file name of the data.

20. The computer system of claim 15, wherein the first index is written on the index partition at a location after the original index.