Linux display disk total statistics including time spent reading and writing data

last updated in Categories File system, Hardware, Linux, Monitoring

Most Linux admins are not aware of hidden switch (undocumented switch) called -D. The -D option display a nice summery of disk I/O subsystem since boot time. Output includes total time spent reading and writing data, merged reads and merged writes (kernel disk i/o optimization technique) and other parameters.
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How do I Find Out Linux CPU Utilization?

last updated in Categories Linux, Sys admin, Tips, Troubleshooting, Tuning

Whenever a Linux system CPU is occupied by a process, it is unavailable for processing other requests. Rest of pending requests must wait till CPU is free. This becomes a bottleneck in the system. Following command will help you to identify CPU utilization, so that you can troubleshoot CPU related performance problems.