Hi zwc.leo,
Please set to max performance mode and using iozone tool to test read/write performance.
$ sudo apt-get install iozone3
Test Commands:
1. Seq R/W :
$ iozone -ecI -+n -L64 -S32 -s64m -r1024k -i0 -i1 -l8 -u8 -m -t8 -F /mnt/file1 /mnt/file2 /mnt/file3 /mnt/file4 /mnt/file5 /mnt/file6 /mnt/file7 /mnt/file8
2. Randrom R/W :
$ iozone -ecI -+n -L64 -S32 -s64m -r4k -i0 -i2 -l8 -u8 -o -m -t8 -F /mnt/file1 /mnt/file2 /mnt/file3 /mnt/file4 /mnt/file5 /mnt/file6 /mnt/file7 /mnt/file8