Intra-device data protection in a raid array

  • US 8,832,373 B2
  • Filed: 06/10/2013
  • Issued: 09/09/2014
  • Est. Priority Date: 09/28/2010
  • Status: Active Grant
First Claim
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1. A computer system comprising:

  • a client computer configured to send read and write requests over a network;

    a data storage subsystem coupled to the network configured to receive the read and write requests, the data storage subsystem comprising a plurality of storage devices;

    wherein the data storage subsystem further comprises a storage controller configured to;

    identify a unit of data stored in the data storage subsystem, wherein said unit of data is stored across at least a first storage device and a second storage device of the plurality of storage devices, each of the first storage device and the second storage device storing intra-device redundancy data corresponding to the unit of data; and

    change an amount of intra-device redundancy data corresponding to the unit of data on only the first storage device without changing an amount of intra-device redundancy data corresponding to the unit of data on the second storage device.

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