Patent ID: 6341333
Filing Date: 2002-01-22
Classification: G06F,G11B

Abstract:
A method for exchanging data stored in a first logical volume having a first data processing identification with data stored in a second logical volume having a second data processing identification comprising the steps of:A) establishing a data transfer path between the first logical volume and a third logical volume and a data transfer path between the second logical volume and a fourth logical volume, B) copying the data in the first and second logical volumes to the third and fourth logical volumes, respectively, independently of and concurrently with responses to I/O requests to the first and second logical volumes, C) disabling data transfers to the first and second logical volumes whereby I/O requests are directed to be processed by the third and fourth logical volumes, respectively, D) configuring the first logical volume to have the second data processing identification and the second logical volume to have the first data processing identified, and E) transferring data in the third logical volume to the second logical volume with the first data processing identification and the data in the fourth logical volume to the first logical volume with the second data processing identification.