服务器内存太大，做一次IO测试需要两倍的内存大小。修改启动内存大小，减少测试时间！
1.# vi /boot/grub/grub.conf
- kernel /vmlinuz-2.6.32-220.el6.x86_64 ro root=/dev/mapper/vghadoop-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb crashkernel=auto rd_NO_DM rd_LVM_LV=vghadoop/lv_swap rhgb crashkernel=auto quiet KEYBOARDTYPE=pc KEYTABLE=us rd_LVM_LV=vghadoop/lv_root mem=1024M
2.# reboot
即可！
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