Patent ID: 9483204
Filing Date: 2016-11-01
CPC Classification: G06F

Claim Text:
1. A method for performing volume replication operation, comprising: forming a first mirroring pair composed of a first volume and a second volume; providing at least one first volume log table (VLT) and a first volume block update table (VBUT) for the first volume, and providing at least one second VLT and a second VBUT for the second volume; administering the at least one first VLT and the first VBUT and the at least one second VLT and the second VBUT, wherein the at least one first VLT and the at least one second VLT are used for recording synchronization state information after the first volume and the second volume forms the first mirroring pair for a first synchronization operation, and the first VBUT and second VBUT are used for recording updated state information of each data block of the first volume and the second volume, respectively; forming a second mirroring pair composed of the first volume and a third volume; providing at least one third VLT and a third VBUT for the third volume; and administering the at least one first VLT and the first VBUT and the at least one third VLT and the third VBUT, wherein the at least one first VLT and the at least one third VLT are used for recording synchronization state information after the first volume and the third volume forms the second mirroring pair for a second synchronization operation, and the first VBUT and the third VBUT are used for recording updated state information of each data block of the first volume and the third volume, respectively; wherein the first VBUT, the second VBUT, and the third VBUT have a plurality of entries each of them used for recording a sequence number to represent the updated state information of each data block of the first volume, the second volume, and the third volume, respectively.