1. A method of read/write operation in a RAID-5 configured storage system having a RAID controller, a RAID cache memory, a plurality of physical disks, and one or more logical disks, the method comprising: reading data from said logical disk; writing data to said logical disk; flushing data from said cache memory to said logical disk when the RAID controller is idle; and otherwise performing read/write operations under the control of the RAID controller to the cache memory.