Developed RAID DP with combined storage media

Different storage media have different performance in terms of fetching data. Most powerful one is RAM that has characteristics making it fast to serve I/O processes. Then, we have flash memory that has high performance of read tasks but less in write ones. Third one is HDD which is the slowest but most reliable in terms of preserving data. In this model, we used a combination of the first and third one to form a developed structure of RAID DP that has a much better performance. For parity disk drives, we used DRAM memory for its great performance. Because parity disks are the most overloaded with write processes. RAID 1 is also used as inner RAID system to preserve data stored in DRAM SSD (Solid State Drive) to HDD.