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Storage device, backup method and computer program code of this storage device

  • US 7,152,184 B2
  • Filed: 02/01/2005
  • Issued: 12/19/2006
  • Est. Priority Date: 11/22/2001
  • Status: Expired due to Fees
First Claim
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1. A backup method in a storage device including a plurality of storage units, and configured to allow fault-tolerant continuous input and output of data even during a data backup, wherein the plurality of storage units include a first storage unit, a second storage unit, and a third storage unit, the backup method comprising:

  • performing a backup operation of data stored in the second storage unit to a backup device;

    receiving update data;

    storing the received update data in the third storage unit;

    updating data stored in the first storage unit by utilizing the update data; and

    when there is a failure in the first storage unit during the backup operation, updating data stored in the second storage unit based on the update data stored in the third storage unit and subsequently updating data that has been stored in the first storage unit by utilizing the data stored in the second storage unit.

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