Evaluation of Volume Tiering Method and SSD Cache Method in Tiered Storage System

Abstract

We evaluated the storage I/O response time with the volume tiering method and the SSD cache method on the tiered storage having SSD and HDD. The simulation result shows the volume tiering method improves the storage performance with low I/O locality workload and small SSD capacity. The SSD cache method is effective with read-intensive and high I/O locality workload. Utilizing both methods simultaneously reduces the storage I/O response time by up to 20% with write-intensive workload and large SSD capacity compared to using the volume tiering method or the SSD cache method separately.