Back to results
US 6,209,001 B1Granted
Back-up system capable of performing back-up operation at optional time
AssigneeNEC Corporation
InventorShinichi Takahashi
Life of this patent
Estimating the term…
Abstract
In a back-up system, during normal operation, a first data is stored in a main storage unit and a buffer storage unit and also transferred to an auxiliary storage unit. During a back-up operation, the auxiliary storage unit is no longer updated and the first data stored in the auxiliary storage unit is transferred to a back-up storage unit. Also during the back-up operation, a second data is stored in the main storage unit and the buffer storage unit. Then, after the back-up operation has been performed, the second data is transferred from the buffer storage unit to the auxiliary storage unit.
Claims9
A back-up system comprising:
- a main storage unit;
- a buffer storage unit;
- an auxiliary storage unit;
- a back-up storage unit;
- a control unit for controlling said main storage unit and said auxiliary storage unit in a normal operation such that a first data is written in said main storage unit and said auxiliary storage unit, for controlling said auxiliary storage unit and said back-up storage unit in a back-up operation such that said first data stored in said auxiliary storage unit is transferred to said back-up storage unit, and controlling said main storage unit, said buffer storage unit and said auxiliary storage unit during said back-up operation such that a second data is stored in said main storage unit and said buffer storage unit but is not stored in said auxiliary storage unit, and for controlling said buffer storage unit and said auxiliary storage unit after said back-up operation such that said second data is transferred from said buffer storage to said auxiliary storage unit.
2 more elements
A back-up system comprising:
- a main storage unit;
- an auxiliary storage unit for storing a same data as that stored in said main storage unit;
- a back-up storage unit;
- a buffer storage unit;
- a control unit for setting a back-up mode in response to a back-up start instruction, for controlling said auxiliary storage unit in said back-up mode such that said auxiliary storage unit does not store any data, for controlling said auxiliary storage unit and said back-up storage unit in said back-up mode during said back-up mode such that a first data stored in said auxiliary storage unit is transferred to said back-up storage unit, and for resetting said back-up mode;
- and
- said control unit also for controlling said buffer storage unit to store a second data during said back-up mode when said second data is stored in said main storage unit, and controls said buffer storage unit and said auxiliary storage unit such that said second data is transferred from said buffer storage to said auxiliary storage unit when said back-up mode is reset.
4 more elements
A back-up system comprising:
- a main storage unit;
- an auxiliary storage unit;
- a back-up storage unit;
- a buffer storage unit;
- a selector;
- a control unit for controlling said main storage unit and said auxiliary storage unit to store a first data in a normal operation, and for controlling said auxiliary storage unit and said back-up storage unit in a back-up operation such that said first data is transferred from said auxiliary storage unit to said back-up storage unit;
- said control unit also for controlling said selector such that said first data is supplied to said auxiliary storage unit in said normal operation;
- and
- said control unit further controlling said selector during said back-up operation such that a second data is supplied to said buffer storage unit when said second data is stored in said main storage unit.
6 more elements
A method of backing up a first data stored in a main memory into a back-up storage unit in an information processing system, comprising the steps of:
- storing a first data in an auxiliary storage unit during a normal operation when said first data is stored in a main storage unit;
- inhibiting update of a storage content of said auxiliary storage unit in a back-up operation;
- transferring said first data from said auxiliary storage unit to said back-up storage unit during said back-up operation;
- and
- storing a second data in a buffer storage unit during said back-up operation when said second data is stored in said main storage unit;
- and
- transferring said second data from said buffer storage unit to said auxiliary storage unit after said back-up operation has been performed.
4 more elements
A method of backing up a first data stored in a main memory into a back-up storage unit in an information processing system, comprising the steps of:
- storing a first data in a main storage unit and an auxiliary storage unit in a normal operation;
- transferring said first data from said auxiliary storage unit to a backup storage unit in a back-up operation;
- transferring said first data to said auxiliary storage unit through a selector in said normal operation;
- transferring a second data to a buffer storage unit through said selector during said back-up operation when said second data is stored in said main storage unit;
- and
- transferring said second data from said buffer storage unit to said auxiliary storage unit after said back-up operation.
3 more elements
A back-up system comprising:
- a main storage unit;
- a buffer storage unit;
- an auxiliary storage unit;
- a back-up storage unit;
- a control unit being operable to store a first data in said main storage unit and said auxiliary storage unit during a first operation;
- said control unit being also operable to transfer said first data from said auxiliary storage unit to said back-up storage unit during said second operation;
- and
- said control unit being further operable to store at least a second data in said main storage unit and said buffer storage unit at the beginning of said second operation and continuing to store at least said second data in said main storage unit and said buffer storage unit during said second operation.
5 more elements
Dependencies are inferred from the claim text.