Write Latencies

Figure 8(a) shows the file write performance of LFS and WOLF under eight traces. Figure 8(b) plots the performance improvement of WOLF over LFS. We can see that WOLF significantly enhances the write performance by 27-35.5%, in terms of improved response times. The lower overall write cost in WOLF directly leads to a smaller write response time. The Hot-cold trace achieves the best improvement because of its good active behavior.

Figure 8: Average File Write Response Time. Errorbar shows the standard deviation. Disk utilization is 90%.