×

Method for optimal retrieval of non-volume-specific data

  • US 5,606,679 A
  • Filed: 02/28/1995
  • Issued: 02/25/1997
  • Est. Priority Date: 02/28/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a data processing system having at least one host system, a storage controller attached to said host system, and a plurality of data storage devices connected to said storage controller, said host system maintaining a host unit control block for each said data storage device of said plurality of data storage devices and said storage controller maintaining a controller unit control block for each of said data storage devices, at least one data storage device being selected as a current Utility Volume, a method for selecting a new Utility Volume for servicing a session generating a non-specific read request for a data record from said host system comprising the steps of:

  • interrogating said session generating the non-specific read request at said host system for said data record, wherein said data record resides on a first data storage device of said plurality of data storage devices having a first host control block corresponding with said non-specific read request;

    determining whether a selection must be made for selecting the new Utility Volume;

    if a new Utility Volume selection is required, selecting the new Utility Volume from said plurality of data storage devices based upon weighted load conditions of said plurality of data storage devices, the new Utility Volume having a lowest weighted load condition and a second host unit control block being associated therewith, wherein said second host unit control block corresponds to a second data storage device of said plurality of data storage devices, said second data storage device different than said first device;

    locking said second host unit control block; and

    transmitting said non-specific read request to said storage controller, said non-specific read request including said second host unit control block.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×