iotop

iotop 便利じゃね？
うぶの場合は
apt-get install iotop
を叩くだけ

root@ubu1204:/home/hirasawa/download/boxfs_src/boxfs-0.7# dpkg -L iotop | grep bin
/usr/sbin
/usr/sbin/iotop
root@ubu1204:/home/hirasawa/download/boxfs_src/boxfs-0.7# 

centにもありました

[root@localhost ~]# rpm -aq | grep iotop
iotop-0.3.2-3.el6.noarch
[root@localhost ~]# rpm -ql iotop | grep bin
/usr/bin/iotop
[root@localhost ~]# 
[root@localhost ~]# file /usr/bin/iotop
/usr/bin/iotop: a /usr/bin/python script text executable
[root@localhost ~]#