Patent ID: 8281069
Filing Date: 2012-10-02
Classification: G06F

Abstract:
1. A method of copying data from a source distributed RAID-1 volume to a target distributed RAID-1 volume of a data storage system, the source distributed RAID-1 volume utilizing a set of first disks distributed among a plurality of locations, the target distributed RAID-1 volume utilizing a set of second disks also distributed among the plurality of locations, such that each of the locations includes one of the first disks and one of the second disks, the plurality of locations being connected to each other by a set of first communication channels of a first bandwidth, the first disk and second disk at each location being coupled together by a respective second communication channel of a second bandwidth greater than the first bandwidth, the method comprising: a normal operating mode in which distributed copy operations from the source distributed RAID-1 volume to the target distributed RAID-1 volume are performed by reading data from a respective first disk of the source distributed RAID-1 volume over a respective first communication channel, then writing the data to each of the second disks of the target distributed RAID-1 volume over the respective first communication channels; a local-copy operating mode in which distributed copy operations from the source distributed RAID-1 volume to the target distributed RAID-1 volume are performed by converting the distributed copy operations to a set of local copy operations, each local copy operation being performed at a respective one of the locations by copying data of the source distributed RAID-1 volume from the first disk of the location to the second disk of the location via the respective second communication channel; and a bulk copy operation including: