命令 

yum install iptop -y

然后输入iotop即可查看

DISK READ and DISK WRITE are the block I/O bandwidth used during the sampling

period. SWAPIN and IO are the percentages of time the thread spent respectively

while swapping in and waiting on I/O more generally. PRIO is the I/O priority at

which the thread is running (set using the ionice command).

Controls: left and right arrows to change the sorting column, r to invert the

sorting order, o to toggle the --only option, p to toggle the --processes

option, a to toggle the --accumulated option, i to change I/O priority, q to

quit, any other key to force a refresh.

Options:

  --version             show program's version number and exit

  -h, --help            show this help message and exit

  -o, --only            only show processes or threads actually doing I/O

  -b, --batch           non-interactive mode

  -n NUM, --iter=NUM    number of iterations before ending [infinite]

  -d SEC, --delay=SEC   delay between iterations [1 second]

  -p PID, --pid=PID     processes/threads to monitor [all]

  -u USER, --user=USER  users to monitor [all]

  -P, --processes       only show processes, not all threads

  -a, --accumulated     show accumulated I/O instead of bandwidth

  -k, --kilobytes       use kilobytes instead of a human friendly unit

  -t, --time            add a timestamp on each line (implies --batch)

  -q, --quiet           suppress some lines of header (implies --batch)