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Automated data relocation among storage tiers based on storage load

  • US 8,429,346 B1
  • Filed: 12/28/2009
  • Issued: 04/23/2013
  • Est. Priority Date: 12/28/2009
  • Status: Active Grant
First Claim
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1. A method for relocating data in a physical storage pool comprising a plurality of storage tiers having differing performance characteristics, the physical storage pool being mapped into one or more logical units, each logical unit comprising a plurality of logical slices of data storage, the method comprising:

  • receiving a relocation list, the relocation list including, for each of a plurality of logical slices, a slice identifier, a temperature value, and a current physical location;

    determining a destination tier for each logical slice on the relocation list;

    evaluating for each logical slice on the relocation list a performance gain expected to be achieved by moving the logical slice from its current physical location to a new location in the destination tier; and

    relocating data in a logical slice from its current physical location to the new location based on the evaluation;

    wherein the destination tier comprises a plurality of RAID groups, each RAID group having an expected temperature value and a performance capability value, the performance capability value being proportional to the throughput of the RAID group; and

    wherein the new location is in a destination RAID group selected based on a ratio of expected temperature value to performance capability value.

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