Patent ID: 6189079
Filing Date: 2001-02-13
Classification: G06F

Abstract:
A method of copying data sets from a first storage device to a second storage device, wherein the first storage device is managed by a first controller and the second storage device is managed by a second controller, comprising:receiving a command with the first controller to copy a plurality of data sets from the first storage device to the second storage device;generating first and second data structures including fields corresponding to the data sets and indicating in the fields that the data sets have not been copied; andfor the data sets subject to the command, performing:(i) transferring a copy of the data set from the first controller to the second controller;(ii) storing with the second controller the copy of the data set received from the first controller in the second storage device;(iii) modifying the field in the first data structure corresponding to the data set copied to the second storage device to indicate that the data set was copied to the second storage device; and(iv) modifying the field in the second data structure corresponding to the data set the second controller stores in the second storage device to indicate that the data set was stored in the second storage device,wherein the first controller generates the first data structure and modifies the first data structure, and wherein the second controller generates the second data structure and modifies the second data structure.