Disk usage related information
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If the performance of a system is poor, then the most common reasons for poor performance are high usage of CPU, memory, network or disk. CPU usage can be monitored using top or htop, memory usage can be seen using free -m or top, network usage can be seen using iptraf, tcptrack, etc. Similalry for disk usage one can use:
- iostat
- iotop
- atop
iostat
One can use following command:
iostat 5
to see disk usage in last five seconds to see if disk usage is very high. The first set of values printed are cumulative till the command was run, so they should be ignored. Second set of values onwards can be used for actual diagnosis.
iotop
To see top like listing of processes but in terms of their disk usage and not CPU, one can use:
iotop
atop
Atop is a more comprehensive monitoring tool. It looks at CPU, RAM, hdd, etc. all parameters while monitoring. This can be useful if combination of various parameters need to be monitored using same tool. To start atop use:
atop
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