Secure redundant storage device and secure read/write method on such a device

A storage device comprising:

• a plurality of redundant physical storage devices;
• a data processing device;
• a file system management module, implemented by the data processing device, generating data read/write commands for the plurality of redundant physical storage devices, the data having to be written redundantly on each of the physical storage devices;
• a module, implemented by the data processing device, for detecting errors by comparing the values of the data read from the plurality of physical storage devices;
• and
• a module, implemented by the data processing device, for applying a transfer function to the read/write commands for a subset of physical storage devices, said transfer function being intended to modify said read/write commands;
• wherein:
• said transfer function is implemented by the data processing unit to apply a second bijective function, defined on a logical address space of the storage device, on the logical address associated with the command;
• said second bijective function replaces the address associated with the command with a result from subtraction of this address from an end address of the logical address space of the storage device.

A storage device comprising:

• a plurality of redundant physical storage devices;
• a data processing device;
• a file system management module, implemented by the data processing device, generating data read/write commands for the plurality of redundant physical storage devices, the data having to be written redundantly on each of the physical storage devices;
• a module, implemented by the data processing device, for detecting errors by comparing the values of the data read from the plurality of physical storage devices;
• and
• a module, implemented by the data processing device, for applying a transfer function to the read/write commands for a subset of physical storage devices, said transfer function being intended to modify said read/write commands;
• wherein:
• said transfer function modifying the data associated with the write commands, the storage device further comprising a module, implemented by the data processing device, for applying an inverse transfer function to the data read from said subset of physical storage devices;
• said transfer function is implemented by the data processing unit to apply a first bijective function, defined on a data space of the storage device, on the data associated with the write commands;
• said first bijective function is implement by the data processing device and performs a ones' complementation of the data associated with the write commands.

A storage device comprising:

• a plurality of redundant physical storage devices;
• a data processing device;
• a file system management module, implemented by the data processing device, generating data read/write commands for the plurality of redundant physical storage devices, the data having to be written redundantly on each of the physical storage devices;
• a module, implemented by the data processing device, for detecting errors by comparing the values of the data read from the plurality of physical storage devices;
• and
• a module, implemented by the data processing device, for applying a transfer function to the read/write commands for a subset of physical storage devices, said transfer function being intended to modify said read/write commands;
• wherein:
• said transfer function is implemented by the data processing unit and inserts additional commands such that the additional commands are inserted at least one of:
• before a first command,
• periodically, and
• randomly.

A method for reading/writing on a storage device comprising a plurality of redundant physical storage devices, comprising the steps:

• receiving an initial read/write command generated by a file system management module implemented by a data processing unit;
• applying a transfer function, by the data processing unit, to said initial read/write command, said transfer function being intended to modify said initial read/write command in order to obtain at least one modified read/write command;
• sending, by the data processing unit, said initial read/write command to a first subset of physical storage devices wherein each physical storage device in the first subset includes a controller;
• sending, by the data processing unit, the modified read/write command or commands to a second subset of physical storage devices wherein each physical storage device in the second subset includes a controller;
• if the command is a write command, the method further comprises:
• generating, by the data processing unit, an associated read command;
• applying, by the data processing unit, the transfer function to the read command generated;
• sending, by the data processing unit, the associated read command to the first subset of physical storage devices;
• sending, by the data processing unit, the read command modified by the transfer function to the second subset of physical storage devices;
• receiving, by the data processing unit, the values read;
• and
• comparing, by the data processing unit, the values read to detect a design error for each controller in the first subset and second subset of physical storage devices.