200.1 Measure and Troubleshoot Resource Usage (weight: 6) LPIC-2 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A file server is experiencing slow response times. `iostat -x 1` shows the following for the main disk (sda): %util=99%, await=250ms, svctm=5ms. The administrator notices that `iotop` shows a single process performing sequential reads. What is the most likely cause of the high await time?

   • AThe system is low on memory, causing the kernel to bypass the page cache
   • BThe disk controller is misconfigured and needs its driver updated
   • CThe disk is failing and needs to be replaced immediately
   • DThe disk is saturated because the single process is issuing I/O faster than the disk can service it
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   Which command is a modern replacement for netstat that displays network connections, routing tables, and interface statistics, and is often preferred for its clearer output and faster execution?

   • Aifstat
   • Bnslookup
   • Css
   • Dip
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   An administrator needs to generate a report showing CPU, memory, and disk I/O usage for the past week to present to management. The sysstat package is installed and collecting data. Which set of commands will produce the required report?

   • A`sar -u`, `sar -r`, and `sar -b` with the `-f` flag pointing to each day's sa file
   • B`top -b -n 1`, `free -m`, and `iostat` run once to capture current usage
   • C`vmstat 1 60`, `free -m`, and `iostat -x 1` run for an hour
   • D`sar -A -f /var/log/sa/saXX` for each day of the week
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   You notice that the system load average is high, and vmstat shows a high number of processes in the 'r' (running) queue, while the CPU is nearly 100% utilized. Which component is the bottleneck?

   • ANetwork
   • BCPU
   • CDisk I/O
   • DMemory
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A database server is responding slowly. The administrator runs `top` and sees the CPU idle time hovering near 0% with most processes in the 'D' (uninterruptible sleep) state. `mpstat -P ALL 1` shows all cores at 100% utilization. Which tool should the administrator use NEXT to pinpoint the root cause?

   • ARun `free -m` to check available memory and swap usage
   • BRun `sar -u 1 5` to collect historical CPU usage trends
   • CRun `iostat -x 1` to check disk utilization and await queue depth
   • DRun `ss -s` to summarize current socket statistics
   Reveal Solution Discussion Select an answer first