Backup system and method for tape recording medium
AssigneeHitachi, Ltd.
InventorsHodaka Furuya, Hitoshi Arai, Tomohiro Shinohara
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Abstract
On the basis of a priority table in which a plurality of group restoration priorities respectively corresponding to a plurality of element groups are recorded, the priority-based backup part backs up all of the backup object elements belonging to a first element group in a first continuous region which is a continuous recording region on a tape recording medium, and backs up all of the backup object elements belonging to a second element group whose group restoration priority is lower than that of said first element group in a second continuous region which is located on the tape tail end side of said first continuous region.
Claims20
A backup system for backing up element groups that have one or more backup object elements on a tape recording medium, comprising priority-based backup means which back up all of the backup object elements belonging to a first element group in a first continuous region constituting a continuous recording region on the tape recording medium, and which back up all of the backup object elements belonging to a second element group whose group restoration priority is lower than the group restoration priority of said first element group in a second continuous region that is located on the tape tail end side of said first continuous region, on the basis of a plurality of group restoration priorities stored by group restoration priority memory means that store the plurality of group restoration priorities respectively corresponding to a plurality of element groups;
- wherein in cases where an edited element group of said first element group is generated following the backup of said first element group, said priority-based backup means read out and restore said first and second element groups from said tape recording medium, back up said restored first element group in a third continuous region of said tape recording medium or a separate tape recording medium, back up said edited element group in an additional fourth continuous region which is connected to said third continuous region on the tape tail end side, and back up said restored second element group in a fifth continuous region which is located on the tape tail end side of said fourth continuous region.
A backup method for backing up element groups that have one or more backup object elements on a tape recording medium, comprising the steps of:
- backing up all of the backup object elements belonging to a first element group in a first continuous region that is a continuous recording region on the tape recording medium on the basis of a plurality of group restoration priorities stored by a group restoration priority memory that stores the plurality of group restoration priorities respectively corresponding to a plurality of element groups;
- backing up all of the backup object elements belonging to a second element group whose group restoration priority is lower than the group restoration priority of said first element group in a second continuous region located on the tape tail end side of said first continuous region;
- and
- restoring element groups from said tape recording medium in accordance with a plurality of restoration timings respectively associated with said plurality of element groups, said restoring including controlling the position of the read-out head of said tape recording medium in advance in the case of restoration in a nighttime batch so that the position matches the position where read-out is started at the start of said nighttime batch.
A computer readable storage medium having a computer program for causing a computer to perform the steps of:
- referring to group restoration priority memory that store a plurality of group restoration priorities respectively corresponding to a plurality of element groups that have one or more backup object elements, and backing up all of the backup object elements belonging to a first element group in a first continuous region which is a continuous recording region on a tape recording medium on the basis of said plurality of group restoration priorities;
- backing up all of the backup object elements belonging to a second element group whose group restoration priority is lower than the group restoration priority of said first element group, in a second continuous region located on the tape tail end side of said first continuous region;
- and
- restoring element groups from said tape recording medium in accordance with a plurality of restoration timings respectively associated with said plurality of element groups, said restoring including controlling the position of the read-out head of said tape recording medium in advance in the case of restoration in a nighttime batch so that the position matches the position where read-out is started at the start of said nighttime batch.
A backup system for backing up element groups that have one or more backup object elements on a tape recording medium, comprising:
- priority-based backup means which back up all of the backup object elements belonging to a first element group in a first continuous region constituting a continuous recording region on the tape recording medium, and which back up all of the backup object elements belonging to a second element group whose group restoration priority is lower than the group restoration priority of said first element group in a second continuous region that is located on the tape tail end side of said first continuous region, on the basis of a plurality of group restoration priorities stored by group restoration priority memory means that store the plurality of group restoration priorities respectively corresponding to a plurality of element groups;
- wherein in cases where a differential element group of said first element group is generated following the backup of said first element group, said priority-based backup means read out and restore said first and second element groups from said tape recording medium, back up a set comprising said first element group and said differential element group in which the duplicate portions of said restored first element group and said differential element group have been removed from said first element group in a third continuous region of said tape recording medium or a separate tape recording medium, and back up said restored second element group in a fourth continuous region located on the tape tail end side of said third continuous region.
A backup system for backing up element groups that have one or more backup object elements on a tape recording medium, comprising:
- priority-based backup means which back up all of the backup object elements belonging to a first element group in a first continuous region constituting a continuous recording region on the tape recording medium, and which back up all of the backup object elements belonging to a second element group whose group restoration priority is lower than the group restoration priority of said first element group in a second continuous region that is located on the tape tail end side of said first continuous region, on the basis of a plurality of group restoration priorities stored by group restoration priority memory means that store the plurality of group restoration priorities respectively corresponding to a plurality of element groups;
- and
- restoration means that restore element groups from said tape recording medium in accordance with a plurality of restoration timings respectively associated with said plurality of element groups, wherein said restoration means control the position of the read-out head of said tape recording medium in advance in the case of restoration in a nighttime batch so that the position matches the position where read-out is started at the start of said nighttime batch.
Dependencies are inferred from the claim text.