Patent ID: 7571291
Filing Date: 2009-08-04
Classification: G06F

Abstract:
1. An information processing system comprising: a secondary storage device for retaining a recording medium configuring a virtual logical volume; a data processing apparatus for processing data recorded in the virtual logical volume of said secondary storage device; and a primary storage device, of which access speed is higher than said recording medium retained in said secondary storage device and which is connected to said data processing apparatus; for reading out, in response to an access request from said data processing apparatus, from said secondary storage device and recording the data; said primary storage device comprising: at least two current storage units configuring a logical volume in which data read out from the virtual logical volume of said secondary storage device in order that said data processing apparatus has an access to the data to process the same is recorded, and being in a mirroring relationship; at least two spare storage units operable to be used in the mirroring relationship; a hierarchy controlling unit dumping data not accessed from said data processing apparatus to said recording medium configuring the virtual logical volume; a mapping table showing a relationship between data recorded in the logical volume of said current storage units and data recorded in the virtual logical volume of said recording medium; and a restoring unit for, when said at least two current storage units in the mirroring relationship concurrently fail, reading out data recorded in the logical volume of said current storage units from the virtual logical volume of said secondary storage device on the basis of the relationship held in said mapping table, recording the data on said at least two spare storage units, thereby restoring, on said at least two spare storage units, the logical volume of said at least two current storage units.