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Data storage system and method for operating a disk controller including allocating disk space for compressed data

  • US 5,574,952 A
  • Filed: 05/11/1994
  • Issued: 11/12/1996
  • Est. Priority Date: 05/11/1994
  • Status: Expired due to Term
First Claim
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1. A data storage system, comprising:

  • a data compression unit for compressing a data unit prior to the data unit being written to a disk in said data storage unit; and

    a disk controller coupled to said disk for allocating contiguous space in said disk for writing a compressed data unit therein, said disk controller including means for comparing a size of a compressed data unit to an amount of said contiguous space previously allocated for the data unit, and for managing said disk in a log-structured manner wherein modifications, instead of being written in place in a data unit being modified, are written to said disk in a sequential log-like file structure and only when said compressed data unit is larger than the contiguous space previously allocated for the data unit.

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