1.load disk info and svr info from ym's record ../tencprocess/diskInfoLoad.R 2.locate_fail.R Locate faild disk id from ym's record 3.virtdisk_norm.R simulate normal disks by bootstraping to generate normal virtual disk 4.generate virtual disks for server with failed disks virtdisk_fail.R 5.function to generate hazard rate hazard_rate.R 6.main script to generate hazard rate main_hr.R