ABSTRACT

Because the cloud serves many workloads concurrently, its disk access pattern is highly random and heterogeneous. In addition, because various virtual machines access to files respectively, meta data utilization and small write requests are increased. In order to build a system for these patters, we should analyze the modern techniques used at cloud system. First, we show that a SATA controller has enough processing capability to serve six disks without performance degradation. Motivated by this experiment, we compare three disk configurations by executing benchmark applications. From the result, we observe that accessing independent disks directly provides better performance than RAID-0 and RAID-5. Lastly, we performed experiment about comparing frequently used protocols (NFS, iSCSI)[8] and got the result that iSCSI[10] showed better performance than NFS[11]