Input/output control unit, disk array apparatus, input/output control method, and program

A disk array apparatus comprising:

• a first input/output unit that sends and receives data to and from a disk array unit;
• a second input/output unit that sends and receives data to and from a host device;
• a third input/output unit that operates in one of a plurality of working modes including a first working mode for sending and receiving data to and from said disk array unit and a second working mode for sending and receiving data to and from said host device;
• an abnormal state detecting unit which detects that said first input/output unit or said second input/output unit is in an abnormal state;
• a shared memory that stores a table which includes a plurality of adapter attribute information including input/output unit ID identifying said input/output unit, and a working mode of said input/output unit;
• and
• a working mode setting unit which exchanges said working mode of the third input/output unit stored in said table for said working mode of said first input/output unit stored in said table when it is detected by said abnormal state detecting unit that said first input/output unit is in an abnormal state, and exchanges said working mode of said third input/output unit stored in said table for said working mode of said second input/output unit stored in said table when it is detected by said abnormal state detecting unit that said second input/output unit is an abnormal state, wherein
• said third input/output unit reads said exchanged working mode included in said adapter attribute information including said input/output unit ID of said third input/output unit and operates in said read working mode when it is detected by said abnormal state detecting unit that said first input/output unit or said second input/output unit is in an abnormal state, and
• each of said first input/output unit and said second input/output unit reads said exchanged working mode included in said adapter attribute information including said input/output unit ID of each of said first input/output unit and said second input/output unit and operates in said read working mode when each of said first input/output unit and said second input/output unit is activated.

An input/output control method for controlling an input/output control unit which includes a first input/output unit that sends and receives data to and from a first external apparatus and a second input/output unit that sends and receives data to and from a second external apparatus, and which receives data from one of said first external apparatus and said second external apparatus, and sends the data received to the other of the first external apparatus and the second external apparatus, comprising:

• detecting that said first input/output unit or said second input/output unit is in an abnormal state;
• exchanging a working mode of a third input/output unit stored in a shared memory that stores a table which includes a plurality of adapter attribute information including input/output unit ID identifying said input/output unit, and a working mode of said input/output unit for said working mode of said first input/output unit stored in said table, when it is detected that said first input/output unit is in an abnormal state;
• exchanging a working mode of said third input/output unit stored in a shared memory that stores a table which includes a plurality of adapter attribute information including input/output unit ID identifying said input/output unit, and a working mode of said input/output unit for said working mode of said input/output unit for second input/output unit stored in said table, when it is detected that said second input/output unit is in an abnormal state;
• reading said exchanged working mode included in said adapter attribute information including said input/output unit ID of said third input/output unit and making said third input/out unit operate in said read working mode when it is detected that said first input/output unit or said second input/output nit is in an abnormal state;
• and
• reading said exchanged working mode included in said adapter attribute information including said input/output unit ID of each of said first input/output unit and said second input/output unit and making each of said first input/output unit and said second input/output unit operate in said read working mode when each of said first input/output unit and said second input/output unit is activated.

A non-transitory computer readable medium recording thereon a program, said program causing an input/output control unit which includes a first input/output unit that sends and receives data to and from a first external apparatus and a second input/output unit that sends and receives data to and from a second external apparatus, and which receives data from one of said first external apparatus and said second external apparatus, and sends the data received to the other of the first external apparatus and the second external apparatus to perform a method, said method comprising:

• detecting that said first input/output unit or said second input/output unit is in an abnormal state;
• exchanging a working mode of a third input/output unit stored in a shared memory that stores a table which includes a plurality of adapter attribute information including input/output unit ID identifying said input/output unit, and a working mode of said input/output unit for said working mode of said first input/output unit stored in said table, when it is detected that said first input/output unit is in an abnormal state;
• exchanging a working mode of said third input/output unit stored in a shared memory that stores a table which includes a plurality of adapter attribute information including input/output unit ID identifying said input/output unit, and a working mode of said input/output unit for said working mode of said input/output unit for second input/output unit stored in said table, when it is detected that said second input/output unit is in an abnormal state;
• reading said exchanged working mode included in said adapter attribute information including said input/output unit ID of said third input/output unit and making said third input/out unit operate in said read working mode when it is detected that said first input/output unit or said second input/output unit is in an abnormal state;
• and
• reading said exchanged working mode included in said adapter attribute information including said input/output unit ID of each of said first input/output unit and said second input/output unit and making each of said first input/output unit and said second input/output unit operate in said read working mode when each of said first input/output unit and said second input/output unit is activated.

An input/output controller comprising:

• a first input/output means for sending and receiving data to and from a first external apparatus;
• a second input/output means for sending and receiving data to and from a second external apparatus;
• a third input/output means for operating in one of a plurality of working modes including a first working mode for sending and receiving data to and from said first external apparatus and a second working mode for sending and receiving data to and from said second external apparatus;
• an abnormal state detecting means for detecting that said first input/output means or said second input/output means is in an abnormal state;
• a shared memory means for storing a table which includes a plurality of adapter attribute information including input/output means ID that identifies said input/output means, and a working mode of said input/output means;
• and
• a working mode setting means for exchanging said working mode of said third input/output means stored in said table for said working mode of said first input/output means stored in said table when it is detected by said abnormal state detecting means that said first input/out means is in an abnormal state,and exchanges said working mode of said third input/output means stored in said table for said working mode of said second input/out means stored in said table when it is detected by said abnormal state detecting means that said second input/output means is an abnormal state, wherein
• said third input/out means reads said exchanged working mode included in said adapter attribute information including said input/output means ID of said third input/output means and operates in said read working mode when it is detected by said abnormal state detecting means that said first input/output means or said second input/output means is in an abnormal state, and
• each of said first input/output means and said second input/output means reads said exchanged working mode included in said adapter attribute information including said input/output means ID of each of said first input/output means and said second input/output means and operates in said read working mode when each of said first input/output means and said second input/output means is activated.