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ANALYZING SUB-LUN GRANULARITY FOR DYNAMIC STORAGE TIERING

  • US 20120072662A1
  • Filed: 02/03/2011
  • Published: 03/22/2012
  • Est. Priority Date: 09/21/2010
  • Status: Active Grant
First Claim
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1. A method for metadata management in a storage system, comprising:

  • using a computer or processor to perform the steps ofproviding a least recently used (LRU) queue of a maximum size, the LRU queue configured for holding metadata for a maximum number of sub-LUNs;

    determining whether the metadata for a particular sub-LUN is held in the LRU queue when the particular sub-LUN is being accessed;

    updating the metadata for the particular sub-LUN and moving the updated metadata to the head of the LRU queue when the metadata for the particular sub-LUN is held in the LRU queue;

    inserting the metadata for the particular sub-LUN to the LRU queue when the LRU queue is not full and the metadata for the particular sub-LUN is not held in the LRU queue;

    replacing a last entry in the LRU queue with the metadata for the particular sub-LUN and moving that entry to the head of the LRU queue when the LRU queue is full and the metadata for the particular sub-LUN is not held in the LRU queue; and

    controlling the number of sub-LUNs in the storage system to manage an amount of data accessed within a range of sub-LUNs including the particular sub-LUN with respect to an amount of available data storage within the range of sub-LUNs including the particular sub-LUN.

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