Computer system and bandwidth control method for the same

A computer system, comprising:

• a first computer;
• a second computer connected to the first computer;
• and
• a storage apparatus connected to both the first and second computers, wherein
• the first and second computers assign priorities to access requests coming from a client computer connected to the first computer based on an attribute of the client computer, wherein
• the first computer
• receives information about the priorities assigned by the second computer,
• determines a bandwidth with the storage apparatus using the received information about the priorities assigned by the second computer and information about the priorities assigned by the first computer with a rest of the computers, and
• transmits the access request to the storage apparatus based on the determined bandwidth.

A computer, comprising:

• a control section;
• a first connection section connected to a storage apparatus for sharing among other computers;
• a second connection section connected to the other computers;
• a third connection section connected to a client computer;
• and
• memory, wherein
• the control section
• assigns priorities to access requests coming from the client computer via the third connection section based on specific information, and stores a result into the memory,
• receives information about the priorities from the other computers,
• based on the information about the priorities of the other computers and information about the priorities assigned to the access requests stored in the memory, determines a bandwidth with the storage apparatus, and
• based on the determined bandwidth, transmits the access requests to the storage apparatus via the first connection section.

A computer, comprising:

• a first computer;
• a second computer connected to the first computer;
• and
• a storage apparatus connected to both the first and second computers, wherein
• the first and second computers
• assign priorities to access requests coming from a client computer connected to the first computer based on information specifically about an attribute of the client computer, wherein
• the first computer
• receives information about the priorities assigned by the second computer, and
• totalizes the priorities assigned to the received access requests, and exchanges a totalized priority value with the second computer, wherein
• the first computer
• adds-up the totalized priority value received from the second computer and the totalized priority value of the first computer, calculates a ratio of the totalized priority value for the first computer to the add-up value, and determines the bandwidth with the storage apparatus in accordance with the ratio, and
• based on the determined bandwidth, transmits the access requests to the storage apparatus, wherein
• the specific information is provided with information telling that, when the client computer asks the first computer to execute a data reading process, an access request relative to the data reading process is assigned with a low priority, and when the client computer asks the first computer to execute a data writing process, an access request relative to the data writing process is assigned with a high priority, and the specific information is provided with information telling that, when the client computer asks the first computer to execute an online job, an access request relative to the online job is assigned with a high priority, and when the client computer asks the first computer to execute a batch job, an access request relative to the batch job is assigned with a low priority.