Achieving data consistency with point-in-time copy operations in a parallel I/O environment

A method of processing a point-in-time copy of data associated with a logical storage volume, the method comprising:

• receiving first data associated with a logical volume;
• sending the first data over I/O channels in a striped fashion for storage across more than one physical source volume;
• storing the first data on the more than one physical source volume;
• receiving a first point-in-time copy command concerning the first data;
• distributing the first point-in-time copy command over the I/O channels to each of the physical source volumes;
• establishing a point-in-time copy relationship between each physical source volume and a corresponding one of a set of more than one physical target volumes;
• receiving second data associated with the logical volume to update the first data;
• sending the second data over the I/O channels in a striped fashion for storage across the more than one physical source volume;
• executing the distributed first point-in-time copy command by copying the first data stored on each physical source volume to the corresponding physical target volume;
• and
• storing the second data on a physical source volume after the first data has been copied to the corresponding physical target volume.