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Data storage system and method of routing or assigning disk write requests among a set of disks using weighted available disk space values

  • US 6,317,808 B1
  • Filed: 03/26/1999
  • Issued: 11/13/2001
  • Est. Priority Date: 03/26/1999
  • Status: Expired due to Term
First Claim
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1. A method of assigning a disk write request among a set of disks, comprising:

  • ranking each disk xi in the set of disks by a number of disk write requests received since disk xi was last assigned a disk write request;

    assigning a weight factor to each disk xi based upon the rank of disk xi;

    storing for each disk in the set of disks a respective available space value that is determined by an available disk space in that disk;

    receiving a disk write request;

    generating a weighted available space value for each disk in accordance with a predefined function of the respective available space value and the weight factor for the disk; and

    assigning the disk write request to the disk having the highest associated weighted available space value.

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