| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for providing high availability and reducing capacity requirements of storage systems. <P>SOLUTION: A virtual volume is allocated from at least one storage element. A capacity pool includes disk drives and at least a portion of external storage volume. The storage elements of the capacity pool are allocated to the virtual volume in response to a data access request. The system further includes a host computer coupled to the storage subsystems and configured to switch input/output path between the storage subsystems. Each of the storage subsystems is adapted to copy received write I/O request to other storage subsystems. Upon receipt of request from another storage subsystem, storage element of the capacity pool of storage subsystem is prevented from being allocated to the virtual volume of that storage subsystem. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
