Disk array system

A disk array system comprising:

• at least one channel control portion for receiving an input/output request of data from an information processor and exchanging said data with said information processor;
• at least one disk control portion for exchanging said data with a disk drive in accordance with said input/output request;
• a cache memory for storing said data exchanged between said channel control portion and said disk control portion;
• a cache switch for forming a communication path between said channel control portion and said cache memory;
• a shared memory for storing said input/output request exchanged between said channel control portion and said disk control portion;
• a power unit;
• and
• a casing for storing said channel control portion, said disk control portion, said cache memory, said cache switch, said shared memory and said power unit, wherein:
• each of said channel control portion, said disk control portion, said cache memory, said cache switch and said shared memory includes a control board having a plurality of electronic circuits different in operating voltage, and a voltage converter for converting a single input voltage into voltages for operating said electronic circuits respectively;
• and
• said power unit supplies a voltage to said voltage converter provided in each of said channel control portion, said disk control portion, said cache memory, said cache switch and said shared memory.