Analysis of the File System and Block IO Scheduler for SSD in Performance and Energy Consumption

SSD (Solid State Disk) is reconsidered as the next storage device, an alternative to the HDD (Hard Disk Driver). The read/write performance and energy consumption are main aspects to the users. In our experiment, we recognize that the performance and energy consumption of SSD, based on NAND Flash, are mostly related with the file system and block I/O scheduler. In order to gain higher performance and lower energy consumption, we test the different combination of file system and scheduler under workload simulator, File bench, using three kinds of commercial SSDs. According to the different combination of file system and block I/O, we analyze the performance parameter, IOPS, and energy consumption parameter, POWER, under some special workload. Lastly, we present a parameter, aggregative indicator (AI), to evaluate the overall characteristic of some combination of file system and block I/O, which synthesizes IOPS and POWER. It is to find a better combination for special workload. In the experiment, the combination of extent file system (ext2 or ext3) and CFQ expresses better more value of the aggregative indicator than others.