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System And Method For Flexible Physical-Logical Mapping Raid Arrays

  • US 20080120462A1
  • Filed: 09/22/2005
  • Published: 05/22/2008
  • Est. Priority Date: 09/22/2005
  • Status: Active Grant
First Claim
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1. A method of allocating physical memory from a group of N memory devices to logical volumes, the method comprising:

  • partitioning the group of N memory devices into a plurality of bands, each of the group of N memory devices sharing a portion of each of the plurality of bands;

    generating a cluster map for each of the plurality of bands, each cluster map indicating the physical address for each of a plurality of clusters, each of the plurality of clusters equally distributed over two or more of the N memory devices to ensure a specified level of redundancy for each of the plurality of bands, each of the N memory devices sharing an approximately equal number of clusters;

    determining if a band is available; and

    allocating an available band to a logical volume.

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