iotop is a nice tool to monitor I/O usage information output by the Linux kernel (requires 2.6.20 or later). To install iotop with yum as root (for RedHat / Fedora / Centos based systems only)&nb [ ... ]

iftop  listens to network traffic on an interface and displays the result in a nice "top-like" style. iftop does for network usage what top does for CPU usage. Homepage: http://www.ex-parrot.com [ ... ]