Patent ID: 7587466
Filing Date: 2009-09-08
Classification: G06F

Abstract:
1. A computer system comprising: a first computer; a first storage system coupled to said first computer; a second storage system coupled to said first storage system; and a second computer coupled to said second storage system, wherein said first storage system includes a first controller and a plurality of first logical volumes accessed from said first controller, wherein said second storage system includes a second controller and a plurality of second logical volumes accessed from said second controller, wherein said plurality of first logical volumes include: wherein said plurality of second logical volumes include: wherein said primary command device is provided with a first management table for recording pair information to indicate which primary data volume and which secondary data volume form a pair, wherein said second command device is provided with a second management table for recording pair information to indicate which primary data volume and which secondary data volume form a pair, wherein said first controller stores command device management information regarding said first command device and said second command device forming a pair with said first command device, wherein said first computer includes: wherein said second computer includes: wherein said first backup unit performs: wherein in response to the instruction, said first copy control unit writes a catalog write instruction to write said prepared catalog information in said first management table and a volume copy instruction to copy data in said certain primary data volume in a certain secondary data volume, to said first command device, wherein said first controller, in response to said catalog write instruction stored in said first command device, writes said catalog information to said first management table, wherein said first controller, in response to said volume copy instruction stored in said first command device, performs the following processes (A) and (B) concurrently: wherein said second controller, in response to a write instruction from said first controller, writes catalog information to said second management table, writes the data group from said first controller to said certain secondary data volume, wherein said second copy control unit receives said catalog information from said second management table and transfers said received catalog information to said second backup unit, wherein said second backup unit, by using catalog information from said second copy control unit, performs backup or recovery of a data group in said certain secondary data volume, wherein said catalog information is information for said second backup unit to perform backup or recovery, and is information for guaranteeing the consistency of the data used by said first backup unit.