Method for utilizing tape media segmentation

• US 7,406,580 B2
• Filed: 08/25/2003
• Issued: 07/29/2008
• Est. Priority Date: 08/25/2003
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Noel, Michael Ray, Ashton, Lyn Lequam, Dawson, Erika Marianna, Gundy, Lisa Joan, Kissinger, Stanley Mark
• Primary Examiner(s): Sparks; Donald
• Assistant Examiner(s): RUTZ, JARED IAN
• Application Number:
  US10/648,584
• Publication Number:
  US 20050050263A1
• Time in Patent Office: 1,800 Days
• Field of Search: 711/111, 711/173, 360/134
• US Class Current: 711/173
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0644 Management of space entities, e.g. partitions, extents, pools
• CPC Class Codes: G06F 3/0686 Libraries, e.g. tape libraries, jukebox
• CPC Class Codes: G11B 2220/95 Serpentine format, wherein a single track or group of tracks traverses the tape plural times from one end to the other
• CPC Class Codes: G11B 27/032 on tapes G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/107 of operating tapes
• CPC Class Codes: G11B 27/3027 used signal is digitally coded

Abstract

A method is presented for utilizing tape storage media segmentation to improve data access performance. A segmented tape storage medium within a tape cartridge having a first and second segment is utilized. A selection module allows a user to select a user-defined capacity of the tape storage medium that is less than the usable capacity of the tape storage medium. The user-defined capacity allows the user to prefer improved data access over tape storage capacity. Data, when written to the tape, is written only within the user-defined capacity. Data may be written exclusively on the first segment or written on both the first segment and second segment allowing data access to be improved. In addition, the user-defined capacity may correspond to the full capacity of the tape storage media.

Claims

1. A process for utilizing tape storage media segmentation to improve data access performance, the process comprising:

providing a tape storage device having a tape storage medium, the tape storage medium formatted with a serpentine recording path and divided into sixteen head index positions, each head index position including thirty-two tracks;

accessing at least one of a first segment and a second segment on the tape storage medium;

allowing a user to select a user-defined capacity of the tape storage medium that is equivalent to the capacity of the first segment of the tape storage medium and that is less than a usable capacity of the tape storage medium; and

identifying a tape storage device as full when the user-defined capacity of the tape storage medium is used to store the data and to mark the tape storage medium as full.

2. The process of claim 1, wherein allowing a user to select a user-defined capacity further comprises allowing the user to select the user-defined capacity of the tape storage medium before the data has been stored on the tape storage medium.

3. The process of claim 1, wherein allowing a user to select a user-defined capacity further comprises allowing the user to select the user-defined capacity of the tape storage medium after the data has been stored on the tape storage medium.

4. The process of claim 1, further comprising associating the user-defined capacity of the tape storage medium with the tape storage device.

5. The process of claim 1, further comprising writing data to the tape storage medium within the user-defined capacity.