Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

During evening batch processing, users complain that pages served by a CentOS web server take several seconds to load. You log in while the slowdown is happening and capture the following:

$ sar -u 1 5
avg-cpu: %user %system %iowait %idle
          6.1   3.4    29.8   60.2

$ iostat -x 1 3
Device:    %util
nvme0n1    99.7

CPU utilization is low, yet the load average is high and I/O wait is nearly 30 percent. You need an interactive way to identify which running processes are generating the heavy disk I/O so you can restore acceptable response times. Which command should you run first?

  • Run free -h to check overall memory usage.

  • Run vmstat -s to print system-wide virtual-memory counters.

  • Run ss -s to display summary socket statistics.

  • Run sudo iotop --only to view per-process disk I/O in real time.

CompTIA Linux+ XK0-006 (V8)
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