-g 设置自动模式下最大文件大小 Set maximum file size (in Kbytes) for auto mode.
-s 指定文件大小 -s 512k or -s 512M or -s 1G
-f filename 指定临时文件
-F filename filename filename 指定临时文件组
-t # 线程数
-q 指定最大记录大小 -q 512K or -q 512M or -q 1g
-y 指定最小记录大小 -y 512K or -q 512M or -q 1g
-U mountpoint Mount point to unmount and remount between tests. Iozone will unmount and remount this mount point before beginning each test. This guarantees that the buffer cache does not contain any of the file under test.