Method for backing up power supply of disk array device and system thereof
AssigneeHitachi, Ltd.
InventorsMitsuo Fukumori, Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama
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Abstract
A disk array device having two or more disk units, each disk unit including at least one disk drive, at least either of said disk units having parity bits carrying data recovery information, comprises at least one backup battery provided for each of said disk unit.
Claims19
A disk array device having two or more disk units, each disk unit including at least one disk drive, at least one of said disk units having parity bits carrying data recovery information, comprising:
- a plurality of power supplies;
- and
- a plurality of backup batteries;
- wherein at least one of said power supplies and at least one of said backup batteries are provided for each of said disk units;
- and
- wherein when a power failure occurs, ordinary data is stored in said disk unit instead of said parity bits.
A power backup system for a disk array device, said disk array device including an error correction group containing a disk unit storing data and a disk unit storing parity bits carrying data recovery information for said disk unit, said disk unit having at least one disk drive, the power backup system comprising:
- a plurality of power supplies;
- and
- a plurality of backup batteries;
- wherein at least one of said power supplies and at least one of said backup batteries are provided for each said disk unit, a capacity of which is determined according to required power for each said disk unit;
- and
- wherein when a power failure occurs, ordinary data is stored in said disk unit instead of said parity bits.
A disk array device comprising:
- a disk controller configured to accept a request for data transfer from a host apparatus and transmit and receive data;
- a disk drive writing and reading data under control of said disk controller;
- a first power supply monitor provided for said disk controller;
- a second power supply monitor provided for said disk drive;
- a first backup power supply provided for said disk controller,
- a second backup power supply provided for said disk drive;
- wherein said second power supply monitor provided for said disk drive is connected to said disk controller to have a monitoring result from said second power supply monitor provided for said disk drive received by said disk controller;
- and
- wherein operational power is supplied to said disk controller and said disk drive from said second backup power supply according to a monitoring result of said second power supply monitor.
A method of controlling a disk array device including a disk controller accepting data transfer request from a host apparatus to transmit/receive the data, and a disk drive writing/reading data under control of said disk controller, said disk controller having a first power supply monitor and a first backup power supply and said disk drive having a second power supply monitor and a second backup power supply, the method comprising:
- receiving a monitoring result from said second power supply monitor of said disk drive;
- supplying operational power from said second backup power supply to said disk drive according to the monitoring result received from said second power supply monitor;
- and
- acquiring the monitoring result of said second power supply monitor of said disk drive by said disk controller.
Dependencies are inferred from the claim text.