1. A RAID-5 configured storage system comprising: a RAID controller, a non-volatile random access memory (NVRAM) serving as a RAID cache memory, a plurality of physical disks; and at least one logical disk; wherein said storage system is operative to: (1) read data from said logical disk; (2) write data to said logical disk; (3) flush data from said RAID cache memory to said logical disk at predetermined events; and (4) otherwise perform read/write operations under the control of the RAID controller to the cache memory.