is widen year after year as CPUs becoming much more sophisticated in their advanced internal design and high clock rate. Storage systems dependency on mechanical parts is a major bottleneck for the overall computer system performance, these devices have extremely low latency compared to the processor's speed, the processor has to wait for the data to be retrieved from the right location on the magnetic disk, this operation requires repositioning the reading head of the magnetic device to a new location and therefore wasting valuable processor's time. The absence of moving parts and substantial drop of the SSD's (Solid State Devices) cost has motivated researchers to integrate them within the current storage systems in order to minimize the latency generated by the magnetic devices. An interesting question to ask is how SSDs can be used within the existing memory hierarchy and how much performance gain can we achieve by integrating the SSD as a new layer within the current memory hierarchy to form 3-tiers Hybrid Storage System (HSS). In this paper we investigate this question by characterizing and evaluating the performance of 3-tier memory hierarchy based on Sun's ZFS storage model, we show that the SSD storage layer will improve the performance of an I/O intensive workloads such as pure random read workload and an OnLine Transaction Processing (OLTP) workload. We show that the hybrid storage model has increased the workloads' IOPS of the random read, the OLTP by 17.26x, 2.77x respectively. We also show that the file system IOPS have also increased by 17.08x, 2.76x respectively. The hybrid storage IOPS have