Patent ID: 9058305
Filing Date: 2015-06-16
Classification: G06F,Y10S

Abstract:
1. A remote copy system comprising: a first storage system having a first logical volume accompanied with at least one of a first plurality of disk drives in the first storage system; a second storage system having a second logical volume that is a virtual volume not accompanied with at least one of a second plurality of disk drives in the second storage system, the virtual volume configuring a first remote copy pair with the first logical volume; and a third storage system having a third logical volume accompanied with at least one of a third plurality of disk drives in the third storage system, the third logical volume configuring a second remote copy pair with the virtual volume and storing a copied data of data stored in the first logical volume, wherein, if the first storage system receives write data sent from a first host computer to the first logical volume, the first storage system stores the write data in the at least one of the first plurality of disk drives and sends the write data to the virtual volume in the second storage system according to a synchronous remote copy procedure, wherein, if the second storage system receives the write data sent from the first storage system to the virtual volume, the second storage system transfers the write data to the third logical volume in the third storage system according to an asynchronous remote copy procedure, wherein, if the third storage system receives the write data transferred from the second storage system to the third logical volume, the third storage system stores the write data in the at least one of the third plurality of disk drives, and wherein, if the second storage system receives write data sent from a second host computer coupled to the second storage system, the second storage system stores the write data sent from the second host computer to a storage area provided by the at least one of the second plurality of disk drives in the second storage system.